kern/49707: i386 i915drmkms on 82845G/GL panic with Xorg intel driver

[jdbaker%mylinuxisp.com@localhost]

>Number:         49707
>Category:       kern
>Synopsis:       i386 i915drmkms on 82845G/GL panic with Xorg intel driver
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 01 01:35:00 +0000 2015
>Originator:     John D. Baker
>Release:        NetBSD/i386-7.99.5
>Organization:
>Environment:
NetBSD gx260a 7.99.5 NetBSD 7.99.5 (GENERIC) #4: Sat Feb 28 13:46:11 CST 2015  sysop%skuld.technoskunk.fur@localhost:/d0/build/current/obj/i386/sys/arch/i386/compile/GENERIC i386

>Description:
Dell Optiplex GX260 built-in video via i82845G/GL attaches i915drmkms
and intelfb drivers.  Framebuffer console works.  Xorg with "wsfb"
driver works.

Xorg with "intel" driver (in "xorg.conf" or autodetected) panics and
reboots machine near instantly.  The "NoAccel" option has no effect.

"dmesg" and "var/log/messages" excerpts (machine is diskless/NFS root).

[...]
Dell Computer Corporation OptiPlex GX260               
[...]
pchb0 at pci0 dev 0 function 0: Intel 82845G/GL DRAM Controller / Host-Hub I/F Bridge (rev. 0x01)
agp0 at pchb0: i830-family chipset
agp0: detected 8060k stolen memory
agp0: aperture at 0xf0000000, size 0x8000000
i915drmkms0 at pci0 dev 2 function 0: Intel 82845G/GL Integrated Graphics Device (rev. 0x01)
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
i915drmkms0: map 2 failed
pci_mem_find: void region
i915drmkms0: map 3 failed
pci_mem_find: void region
i915drmkms0: map 4 failed
pci_mem_find: void region
i915drmkms0: map 5 failed
DRM debug in drm_minor_register: 
DRM debug in drm_minor_register: new minor assigned 64
DRM debug in drm_minor_register: 
DRM debug in drm_minor_register: 
DRM debug in drm_minor_register: new minor assigned 0
DRM debug in i915_dump_device_info: i915 device info: gen=2, pciid=0x2562 flags=has_overlay,overlay_needs_physical,pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
DRM debug in intel_detect_pch: No PCH found.
drm: Memory usable by graphics device = 128M
DRM debug in i915_gem_gtt_init: GMADR size = 128M
DRM debug in i915_gem_gtt_init: GTT stolen size = 7M
DRM debug in i915_gem_gtt_init: ppgtt mode: 0
DRM debug in intel_opregion_setup: graphic opregion physical addr: 0x0
DRM debug in intel_opregion_setup: ACPI OpRegion not supported!
drm: Supports vblank timestamp caching Rev 2 (21.10.2013).
drm: Driver supports precise vblank timestamp query.
DRM debug in init_vbt_defaults: Set default to SSC at 66667 kHz
pci_mem_find: void region
DRM debug in parse_general_features: BDB_GENERAL_FEATURES int_tv_support 1 int_crt_support 0 lvds_use_ssc 0 lvds_ssc_freq 48000 display_clock_mode 0 fdi_rx_polarity_inverted 0
DRM debug in parse_general_definitions: crt_ddc_bus_pin: 2
DRM debug in parse_sdvo_device_mapping: different child size is found. Invalid.
DRM debug in parse_device_mapping: different child size is found. Invalid.
DRM debug in parse_mipi: No MIPI BDB foundDRM debug in intel_display_power_get: enabling always-on
DRM debug in drm_irq_install: irq=268963849
i915drmkms0: interrupting at ioapic0 pin 16 (i915)
DRM debug in intel_modeset_init: 1 display pipe available.
DRM debug in intel_modeset_init: pipe A sprite A init failed: -19
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus dpb. force bit now 1
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus dpb. force bit now 0
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus dpb. force bit now 1
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus dpb. force bit now 0
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus dpb. force bit now 1
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus dpb. force bit now 0
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus ssc. force bit now 1
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus ssc. force bit now 0
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus dpb. force bit now 1
DRM debug in tfp410_init: tfp410 not detected got VID FFFFFFFF: from i915 gmbus dpb Slave 56.
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus dpb. force bit now 0
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus dpb. force bit now 1
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus dpb. force bit now 0
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus dpb. force bit now 1
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus dpb. force bit now 0
DRM debug in intel_modeset_readout_hw_state: [CRTC:5] hw state readout: enabled
DRM debug in intel_modeset_readout_hw_state: [ENCODER:7:DAC-7] hw state readout: enabled, pipe A
DRM debug in intel_modeset_readout_hw_state: [CONNECTOR:6:VGA-1] hw state readout: enabled
DRM debug in intel_dump_pipe_config: [CRTC:5][setup_hw_state] config for pipe A
DRM debug in intel_dump_pipe_config: cpu_transcoder: A
DRM debug in intel_dump_pipe_config: pipe bpp: 0, dithering: 0
DRM debug in intel_dump_pipe_config: fdi/pch: 0, lanes: 0, gmch_m: 0, gmch_n: 0, link_m: 0, link_n: 0, tu: 0
DRM debug in intel_dump_pipe_config: dp: 0, gmch_m: 0, gmch_n: 0, link_m: 0, link_n: 0, tu: 0
DRM debug in intel_dump_pipe_config: requested mode:
DRM debug in drm_mode_debug_printmodeline: Modeline 0:"" 0 0 640 0 0 0 480 0 0 0 0x0 0x0
DRM debug in intel_dump_pipe_config: adjusted mode:
DRM debug in drm_mode_debug_printmodeline: Modeline 0:"" 0 0 0 0 0 0 0 0 0 0 0x0 0xa
DRM debug in intel_dump_crtc_timings: crtc timings: 25154 640 656 752 800 480 490 492 525, type: 0x0 flags: 0xa
DRM debug in intel_dump_pipe_config: port clock: 25154
DRM debug in intel_dump_pipe_config: pipe src size: 640x480
DRM debug in intel_dump_pipe_config: gmch pfit: control: 0x00000000, ratios: 0x00000000, lvds border: 0x00000000
DRM debug in intel_dump_pipe_config: pch pfit: pos: 0x00000000, size: 0x00000000, disabled
DRM debug in intel_dump_pipe_config: ips: 0
DRM debug in intel_dump_pipe_config: double wide: 0
DRM debug in intel_connector_check_state: [CONNECTOR:6:VGA-1]
DRM debug in check_encoder_state: [ENCODER:7:DAC-7]
DRM debug in check_crtc_state: [CRTC:5]
DRM debug in i9xx_get_plane_config: pipe/plane 0/0 with fb: size=640x480@8, offset=0, pitch 640, size 0x4b000
DRM debug in i915_gem_setup_global_gtt: clearing unused GTT space: [0, 7fff000]
DRM debug in i915_gem_context_init: fake context support initialized
drm: initialized overlay support
DRM debug in drm_helper_probe_single_connector_modes: [CONNECTOR:6:VGA-1]
DRM debug in intel_crt_detect: [CONNECTOR:6:VGA-1] force=1
DRM debug in gmbus_xfer: GMBUS [i915 gmbus vga] NAK for addr: 0050 r(1)
DRM debug in drm_do_probe_ddc_edid: drm: skipping non-existent adapter i915 gmbus vga
DRM debug in intel_crt_get_edid: CRT GMBUS EDID read failed, retry using GPIO bit-banging
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus vga. force bit now 1
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus vga. force bit now 0
DRM debug in intel_crt_detect_ddc: CRT not detected via DDC:0x50 [no valid EDID found]
DRM debug in intel_get_load_detect_pipe: [CONNECTOR:6:VGA-1], [ENCODER:7:DAC-7]
DRM debug in intel_crt_detect_ddc: CRT detected via DDC:0x50 [EDID]
DRM debug in intel_release_load_detect_pipe: [CONNECTOR:6:VGA-1], [ENCODER:7:DAC-7]
DRM debug in drm_edid_to_eld: ELD: no CEA Extension found
DRM debug in drm_mode_debug_printmodeline: Modeline 30:"1024x768i" 0 44900 1024 1032 1208 1264 768 768 776 817 0x40 0x15
DRM debug in drm_mode_prune_invalid: Not using 1024x768i mode 7
DRM debug in drm_helper_probe_single_connector_modes: [CONNECTOR:6:VGA-1] probed modes :
DRM debug in drm_mode_debug_printmodeline: Modeline 18:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 17:"1280x960" 60 108000 1280 1376 1488 1800 960 961 964 1000 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 16:"1152x864" 75 108000 1152 1216 1344 1600 864 865 868 900 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 15:"1024x768" 85 94500 1024 1072 1168 1376 768 769 772 808 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 27:"1024x768" 75 78800 1024 1040 1136 1312 768 769 772 800 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 28:"1024x768" 70 75000 1024 1048 1184 1328 768 771 777 806 0x40 0xa
DRM debug in drm_mode_debug_printmodeline: Modeline 29:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa
DRM debug in drm_mode_debug_printmodeline: Modeline 14:"800x600" 85 56250 800 832 896 1048 600 601 604 631 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 31:"800x600" 75 49500 800 816 896 1056 600 601 604 625 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 32:"800x600" 72 50000 800 856 976 1040 600 637 643 666 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 19:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 20:"800x600" 56 36000 800 824 896 1024 600 601 603 625 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 13:"640x480" 85 36000 640 696 752 832 480 481 484 509 0x40 0xa
DRM debug in drm_mode_debug_printmodeline: Modeline 21:"640x480" 75 31500 640 656 720 840 480 481 484 500 0x40 0xa
DRM debug in drm_mode_debug_printmodeline: Modeline 22:"640x480" 73 31500 640 664 704 832 480 489 491 520 0x40 0xa
DRM debug in drm_mode_debug_printmodeline: Modeline 23:"640x480" 67 30240 640 704 768 864 480 483 486 525 0x40 0xa
DRM debug in drm_mode_debug_printmodeline: Modeline 24:"640x480" 60 25200 640 656 752 800 480 490 492 525 0x40 0xa
DRM debug in drm_mode_debug_printmodeline: Modeline 25:"720x400" 88 35500 720 738 846 900 400 421 423 449 0x40 0xa
DRM debug in drm_mode_debug_printmodeline: Modeline 12:"720x400" 85 35500 720 756 828 936 400 401 404 446 0x40 0x6
DRM debug in drm_mode_debug_printmodeline: Modeline 26:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6
DRM debug in drm_mode_debug_printmodeline: Modeline 11:"640x400" 85 31500 640 672 736 832 400 401 404 445 0x40 0x6
DRM debug in drm_mode_debug_printmodeline: Modeline 10:"640x350" 85 31500 640 672 736 832 350 382 385 445 0x40 0x9
DRM debug in drm_mode_debug_printmodeline: Modeline 9:"640x350" 70 25180 640 656 752 800 350 387 389 449 0x40 0x9
DRM debug in drm_setup_crtcs: 
DRM debug in drm_enable_connectors: connector 6 enabled? yes
DRM debug in intel_fb_initial_config: looking for cmdline mode on connector 6
DRM debug in intel_fb_initial_config: looking for preferred mode on connector 6
DRM debug in intel_fb_initial_config: using first mode listed on connector VGA-1
DRM debug in intel_fb_initial_config: connector VGA-1 on crtc 5: 1280x1024
DRM debug in drm_setup_crtcs: desired mode 1280x1024 set on crtc 5
DRM debug in intelfb_create: no BIOS fb, allocating a new one
DRM debug in drm_framebuffer_reference: FB ID: 33
intelfb0 at i915drmkms0
intelfb0: WARNING: power management not supported
DRM debug in intelfb_create: allocated 1280x1024 fb: 0x00060000, bo 0xc3a80c00
i915drmkms0: info: registered panic notifier
intelfb0: framebuffer at 0xdb667000, size 1280x1024, depth 32, stride 5120
DRM debug in intel_crtc_cursor_set: cursor off
DRM debug in intel_crtc_set_config: [CRTC:5] [FB:33] #connectors=1 (x y) (0 0)
DRM debug in intel_set_config_compute_mode_changes: inactive crtc, full mode set
DRM debug in intel_set_config_compute_mode_changes: modes are different, full mode set
DRM debug in drm_mode_debug_printmodeline: Modeline 0:"" 0 0 0 0 0 0 0 0 0 0 0x0 0x0
DRM debug in drm_mode_debug_printmodeline: Modeline 30:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
DRM debug in intel_set_config_compute_mode_changes: computed changes for [CRTC:5], mode_changed=1, fb_changed=0
DRM debug in intel_modeset_stage_output_state: [CONNECTOR:6:VGA-1] to [CRTC:5]
DRM debug in intel_modeset_affected_pipes: set mode pipe masks: modeset: 1, prepare: 1, disable: 0
DRM debug in connected_sink_compute_bpp: [CONNECTOR:6:VGA-1] checking for sink bpp constrains
DRM debug in intel_modeset_pipe_config: plane bpp: 24, pipe bpp: 24, dithering: 0
DRM debug in intel_dump_pipe_config: [CRTC:5][modeset] config for pipe A
DRM debug in intel_dump_pipe_config: cpu_transcoder: A
DRM debug in intel_dump_pipe_config: pipe bpp: 24, dithering: 0
DRM debug in intel_dump_pipe_config: fdi/pch: 0, lanes: 0, gmch_m: 0, gmch_n: 0, link_m: 0, link_n: 0, tu: 0
DRM debug in intel_dump_pipe_config: dp: 0, gmch_m: 0, gmch_n: 0, link_m: 0, link_n: 0, tu: 0
DRM debug in intel_dump_pipe_config: requested mode:
DRM debug in drm_mode_debug_printmodeline: Modeline 0:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
DRM debug in intel_dump_pipe_config: adjusted mode:
DRM debug in drm_mode_debug_printmodeline: Modeline 0:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
DRM debug in intel_dump_crtc_timings: crtc timings: 108000 1280 1328 1440 1688 1024 1025 1028 1066, type: 0x40 flags: 0x5
DRM debug in intel_dump_pipe_config: port clock: 108000
DRM debug in intel_dump_pipe_config: pipe src size: 1280x1024
DRM debug in intel_dump_pipe_config: gmch pfit: control: 0x00000000, ratios: 0x00000000, lvds border: 0x00000000
DRM debug in intel_dump_pipe_config: pch pfit: pos: 0x00000000, size: 0x00000000, disabled
DRM debug in intel_dump_pipe_config: ips: 0
DRM debug in intel_dump_pipe_config: double wide: 0
DRM debug in drm_calc_vbltimestamp_from_scanoutpos: crtc 0: Noop due to uninitialized mode.
DRM debug in drm_calc_timestamping_constants: crtc 5: hwmode: htotal 1688, vtotal 1066, vdisplay 1024
DRM debug in drm_calc_timestamping_constants: crtc 5: clock 108000 kHz framedur 16661185 linedur 15629, pixeldur 9
DRM debug in drm_vblank_get: enabling vblank on crtc 0, ret: -22
DRM debug in i9xx_update_primary_plane: Writing base 00060000 00000000 0 0 5120
DRM debug in intel_crtc_mode_set: [ENCODER:7:DAC-7] set [MODE:0:1280x1024]
DRM debug in i845_get_fifo_size: FIFO size - (0x0000005f) A: 23
DRM debug in intel_calculate_wm: FIFO entries required for mode: 68
DRM debug in intel_calculate_wm: FIFO watermark level: -47
DRM debug in i845_update_wm: Setting FIFO watermarks - A: 1
DRM debug in intel_connector_check_state: [CONNECTOR:6:VGA-1]
DRM debug in check_encoder_state: [ENCODER:7:DAC-7]
DRM debug in check_crtc_state: [CRTC:5]
DRM debug in drm_framebuffer_reference: FB ID: 33
wsdisplay0 at intelfb0 kbdmux 1: console (default, vt100 emulation), using wskbd0
wsmux1: connecting to wsdisplay0
[...]
[startx]
Feb 28 18:14:31 gx260a sysop: starting X11
Feb 28 18:14:32 gx260a /netbsd: DRM debug in i915_gem_open: 
Feb 28 18:14:32 gx260a /netbsd: DRM debug in intel_crtc_cursor_set: cursor off
Feb 28 18:14:32 gx260a /netbsd: DRM debug in intel_crtc_set_config: [CRTC:5] [FB:33] #connectors=1 (x y) (0 0)
Feb 28 18:14:32 gx260a /netbsd: DRM debug in intel_set_config_compute_mode_changes: computed changes for [CRTC:5], mode_changed=0, fb_changed=0
Feb 28 18:14:32 gx260a /netbsd: DRM debug in intel_modeset_stage_output_state: [CONNECTOR:6:VGA-1] to [CRTC:5]
Feb 28 18:14:32 gx260a /netbsd: DRM debug in drm_framebuffer_reference: FB ID: 33
Feb 28 18:14:32 gx260a /netbsd: DRM debug in drm_framebuffer_unreference: FB ID: 33
Feb 28 18:14:32 gx260a /netbsd: DRM debug in i915_gem_open: 
Feb 28 18:14:32 gx260a /netbsd: DRM debug in drm_mode_getresources: CRTC[1] CONNECTORS[1] ENCODERS[1]
Feb 28 18:14:32 gx260a /netbsd: DRM debug in intel_crtc_cursor_set: cursor off
Feb 28 18:14:32 gx260a /netbsd: DRM debug in intel_crtc_set_config: [CRTC:5] [FB:33] #connectors=1 (x y) (0 0)
Feb 28 18:14:32 gx260a /netbsd: DRM debug in intel_set_config_compute_mode_changes: computed changes for [CRTC:5], mode_changed=0, fb_changed=0
Feb 28 18:14:32 gx260a /netbsd: DRM debug in intel_modeset_stage_output_state: [CONNECTOR:6:VGA-1] to [CRTC:5]
[panic/reboot]


If the console is on the serial port, i915drmkms disables the video
(VGA) output.  Starting X then doesn't panic the machine, but instead
spins forever looking for an active output.

NetBSD 7.99.5 (GENERIC) #4: Sat Feb 28 13:46:11 CST 2015
        sysop%skuld.technoskunk.fur@localhost:/d0/build/current/obj/i386/sys/arch/i386/compile/GENERIC
[...]
Dell Computer Corporation OptiPlex GX260               
[...]
pchb0 at pci0 dev 0 function 0: Intel 82845G/GL DRAM Controller / Host-Hub I/F Bridge (rev. 0x01)
agp0 at pchb0: i830-family chipset
agp0: detected 8060k stolen memory
agp0: aperture at 0xf0000000, size 0x8000000
i915drmkms0 at pci0 dev 2 function 0: Intel 82845G/GL Integrated Graphics Device (rev. 0x01)
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
i915drmkms0: map 2 failed
pci_mem_find: void region
i915drmkms0: map 3 failed
pci_mem_find: void region
i915drmkms0: map 4 failed
pci_mem_find: void region
i915drmkms0: map 5 failed
DRM debug in drm_minor_register: 
DRM debug in drm_minor_register: new minor assigned 64
DRM debug in drm_minor_register:                      
DRM debug in drm_minor_register: 
DRM debug in drm_minor_register: new minor assigned 0
DRM debug in i915_dump_device_info: i915 device info: gen=2, pciid=0x2562 flags=has_overlay,overlay_needs_physical,pci_mem_find: void region
pci_mem_find: void region                                   
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
pci_mem_find: void region
DRM debug in intel_detect_pch: No PCH found.
drm: Memory usable by graphics device = 128M
DRM debug in i915_gem_gtt_init: GMADR size = 128M
DRM debug in i915_gem_gtt_init: GTT stolen size = 7M
DRM debug in i915_gem_gtt_init: ppgtt mode: 0       
DRM debug in intel_opregion_setup: graphic opregion physical addr: 0x0
DRM debug in intel_opregion_setup: ACPI OpRegion not supported!       
drm: Supports vblank timestamp caching Rev 2 (21.10.2013).     
drm: Driver supports precise vblank timestamp query.      
DRM debug in init_vbt_defaults: Set default to SSC at 66667 kHz
pci_mem_find: void region                                      
DRM debug in parse_general_features: BDB_GENERAL_FEATURES int_tv_support 1 int_crt_support 0 lvds_use_ssc 0 lvds_ssc_freq 48000 display_clock_mode 0 fdi_rx_polarity_inverted 0
DRM debug in parse_general_definitions: crt_ddc_bus_pin: 2
DRM debug in parse_sdvo_device_mapping: different child size is found. Invalid.
DRM debug in parse_device_mapping: different child size is found. Invalid.     
DRM debug in parse_mipi: No MIPI BDB foundDRM debug in intel_display_power_get: enabling always-on
DRM debug in drm_irq_install: irq=268963849
i915drmkms0: interrupting at ioapic0 pin 16 (i915)
DRM debug in intel_modeset_init: 1 display pipe available.
DRM debug in intel_modeset_init: pipe A sprite A init failed: -19
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus dpb. force bit now 1
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus dpb. force bit now 0
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus dpb. force bit now 1
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus dpb. force bit now 0
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus dpb. force bit now 1
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus dpb. force bit now 0
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus ssc. force bit now 1
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus ssc. force bit now 0
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus dpb. force bit now 1
DRM debug in tfp410_init: tfp410 not detected got VID FFFFFFFF: from i915 gmbus dpb Slave 56.
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus dpb. force bit now 0
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus dpb. force bit now 1
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus dpb. force bit now 0
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus dpb. force bit now 1
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus dpb. force bit now 0
DRM debug in intel_modeset_readout_hw_state: [CRTC:5] hw state readout: enabled
DRM debug in intel_modeset_readout_hw_state: [ENCODER:7:DAC-7] hw state readout: enabled, pipe A
DRM debug in intel_modeset_readout_hw_state: [CONNECTOR:6:VGA-1] hw state readout: enabled
DRM debug in intel_dump_pipe_config: [CRTC:5][setup_hw_state] config for pipe A
DRM debug in intel_dump_pipe_config: cpu_transcoder: A                         
DRM debug in intel_dump_pipe_config: pipe bpp: 0, dithering: 0
DRM debug in intel_dump_pipe_config: fdi/pch: 0, lanes: 0, gmch_m: 0, gmch_n: 0, link_m: 0, link_n: 0, tu: 0
DRM debug in intel_dump_pipe_config: dp: 0, gmch_m: 0, gmch_n: 0, link_m: 0, link_n: 0, tu: 0
DRM debug in intel_dump_pipe_config: requested mode:
DRM debug in drm_mode_debug_printmodeline: Modeline 0:"" 0 0 640 0 0 0 480 0 0 0 0x0 0x0
DRM debug in intel_dump_pipe_config: adjusted mode:
DRM debug in drm_mode_debug_printmodeline: Modeline 0:"" 0 0 0 0 0 0 0 0 0 0 0x0 0xa
DRM debug in intel_dump_crtc_timings: crtc timings: 25154 640 656 752 800 480 490 492 525, type: 0x0 flags: 0xa
DRM debug in intel_dump_pipe_config: port clock: 25154
DRM debug in intel_dump_pipe_config: pipe src size: 640x480
DRM debug in intel_dump_pipe_config: gmch pfit: control: 0x00000000, ratios: 0x00000000, lvds border: 0x00000000
DRM debug in intel_dump_pipe_config: pch pfit: pos: 0x00000000, size: 0x00000000, disabled
DRM debug in intel_dump_pipe_config: ips: 0
DRM debug in intel_dump_pipe_config: double wide: 0
DRM debug in intel_connector_check_state: [CONNECTOR:6:VGA-1]
DRM debug in check_encoder_state: [ENCODER:7:DAC-7]          
DRM debug in check_crtc_state: [CRTC:5]            
DRM debug in i9xx_get_plane_config: pipe/plane 0/0 with fb: size=640x480@8, offset=0, pitch 640, size 0x4b000
DRM debug in i915_gem_setup_global_gtt: clearing unused GTT space: [0, 7fff000]
DRM debug in i915_gem_context_init: fake context support initialized           
drm: initialized overlay support                                    
DRM debug in drm_helper_probe_single_connector_modes: [CONNECTOR:6:VGA-1]
DRM debug in intel_crt_detect: [CONNECTOR:6:VGA-1] force=1               
DRM debug in intel_crt_detect_ddc: CRT detected via DDC:0x50 [EDID]
DRM debug in drm_edid_to_eld: ELD: no CEA Extension found          
DRM debug in drm_mode_debug_printmodeline: Modeline 30:"1024x768i" 0 44900 1024 1032 1208 1264 768 768 776 817 0x40 0x15
DRM debug in drm_mode_prune_invalid: Not using 1024x768i mode 7
DRM debug in drm_helper_probe_single_connector_modes: [CONNECTOR:6:VGA-1] probed modes :
DRM debug in drm_mode_debug_printmodeline: Modeline 18:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 17:"1280x960" 60 108000 1280 1376 1488 1800 960 961 964 1000 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 16:"1152x864" 75 108000 1152 1216 1344 1600 864 865 868 900 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 15:"1024x768" 85 94500 1024 1072 1168 1376 768 769 772 808 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 27:"1024x768" 75 78800 1024 1040 1136 1312 768 769 772 800 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 28:"1024x768" 70 75000 1024 1048 1184 1328 768 771 777 806 0x40 0xa
DRM debug in drm_mode_debug_printmodeline: Modeline 29:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa
DRM debug in drm_mode_debug_printmodeline: Modeline 14:"800x600" 85 56250 800 832 896 1048 600 601 604 631 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 31:"800x600" 75 49500 800 816 896 1056 600 601 604 625 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 32:"800x600" 72 50000 800 856 976 1040 600 637 643 666 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 19:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 20:"800x600" 56 36000 800 824 896 1024 600 601 603 625 0x40 0x5
DRM debug in drm_mode_debug_printmodeline: Modeline 13:"640x480" 85 36000 640 696 752 832 480 481 484 509 0x40 0xa
DRM debug in drm_mode_debug_printmodeline: Modeline 21:"640x480" 75 31500 640 656 720 840 480 481 484 500 0x40 0xa
DRM debug in drm_mode_debug_printmodeline: Modeline 22:"640x480" 73 31500 640 664 704 832 480 489 491 520 0x40 0xa
DRM debug in drm_mode_debug_printmodeline: Modeline 23:"640x480" 67 30240 640 704 768 864 480 483 486 525 0x40 0xa
DRM debug in drm_mode_debug_printmodeline: Modeline 24:"640x480" 60 25200 640 656 752 800 480 490 492 525 0x40 0xa
DRM debug in drm_mode_debug_printmodeline: Modeline 25:"720x400" 88 35500 720 738 846 900 400 421 423 449 0x40 0xa
DRM debug in drm_mode_debug_printmodeline: Modeline 12:"720x400" 85 35500 720 756 828 936 400 401 404 446 0x40 0x6
DRM debug in drm_mode_debug_printmodeline: Modeline 26:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6
DRM debug in drm_mode_debug_printmodeline: Modeline 11:"640x400" 85 31500 640 672 736 832 400 401 404 445 0x40 0x6
DRM debug in drm_mode_debug_printmodeline: Modeline 10:"640x350" 85 31500 640 672 736 832 350 382 385 445 0x40 0x9
DRM debug in drm_mode_debug_printmodeline: Modeline 9:"640x350" 70 25180 640 656 752 800 350 387 389 449 0x40 0x9
DRM debug in drm_setup_crtcs:    
DRM debug in drm_enable_connectors: connector 6 enabled? yes
DRM debug in intel_fb_initial_config: looking for cmdline mode on connector 6
DRM debug in intel_fb_initial_config: looking for preferred mode on connector 6
DRM debug in intel_fb_initial_config: using first mode listed on connector VGA-1
DRM debug in intel_fb_initial_config: connector VGA-1 on crtc 5: 1280x1024     
DRM debug in drm_setup_crtcs: desired mode 1280x1024 set on crtc 5        
DRM debug in intelfb_create: no BIOS fb, allocating a new one     
DRM debug in drm_framebuffer_reference: FB ID: 33            
intelfb0 at i915drmkms0                          
intelfb0: WARNING: power management not supported
DRM debug in intelfb_create: allocated 1280x1024 fb: 0x00060000, bo 0xc3a80c00
i915drmkms0: info: registered panic notifier                                  
intelfb0: framebuffer at 0xdb667000, size 1280x1024, depth 32, stride 5120
DRM debug in intel_crtc_cursor_set: cursor off                            
DRM debug in intel_crtc_set_config: [CRTC:5] [FB:33] #connectors=1 (x y) (0 0)
DRM debug in intel_set_config_compute_mode_changes: inactive crtc, full mode set
DRM debug in intel_set_config_compute_mode_changes: modes are different, full mode set
DRM debug in drm_mode_debug_printmodeline: Modeline 0:"" 0 0 0 0 0 0 0 0 0 0 0x0 0x0
DRM debug in drm_mode_debug_printmodeline: Modeline 30:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
DRM debug in intel_set_config_compute_mode_changes: computed changes for [CRTC:5], mode_changed=1, fb_changed=0
DRM debug in intel_modeset_stage_output_state: [CONNECTOR:6:VGA-1] to [CRTC:5]
DRM debug in intel_modeset_affected_pipes: set mode pipe masks: modeset: 1, prepare: 1, disable: 0
DRM debug in connected_sink_compute_bpp: [CONNECTOR:6:VGA-1] checking for sink bpp constrains
DRM debug in intel_modeset_pipe_config: plane bpp: 24, pipe bpp: 24, dithering: 0
DRM debug in intel_dump_pipe_config: [CRTC:5][modeset] config for pipe A
DRM debug in intel_dump_pipe_config: cpu_transcoder: A                  
DRM debug in intel_dump_pipe_config: pipe bpp: 24, dithering: 0
DRM debug in intel_dump_pipe_config: fdi/pch: 0, lanes: 0, gmch_m: 0, gmch_n: 0, link_m: 0, link_n: 0, tu: 0
DRM debug in intel_dump_pipe_config: dp: 0, gmch_m: 0, gmch_n: 0, link_m: 0, link_n: 0, tu: 0
DRM debug in intel_dump_pipe_config: requested mode:
DRM debug in drm_mode_debug_printmodeline: Modeline 0:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
DRM debug in intel_dump_pipe_config: adjusted mode:
DRM debug in drm_mode_debug_printmodeline: Modeline 0:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
DRM debug in intel_dump_crtc_timings: crtc timings: 108000 1280 1328 1440 1688 1024 1025 1028 1066, type: 0x40 flags: 0x5
DRM debug in intel_dump_pipe_config: port clock: 108000
DRM debug in intel_dump_pipe_config: pipe src size: 1280x1024
DRM debug in intel_dump_pipe_config: gmch pfit: control: 0x00000000, ratios: 0x00000000, lvds border: 0x00000000
DRM debug in intel_dump_pipe_config: pch pfit: pos: 0x00000000, size: 0x00000000, disabled
DRM debug in intel_dump_pipe_config: ips: 0
DRM debug in intel_dump_pipe_config: double wide: 0
DRM debug in drm_calc_vbltimestamp_from_scanoutpos: crtc 0: Noop due to uninitialized mode.
DRM debug in drm_calc_timestamping_constants: crtc 5: hwmode: htotal 1688, vtotal 1066, vdisplay 1024
DRM debug in drm_calc_timestamping_constants: crtc 5: clock 108000 kHz framedur 16661185 linedur 15629, pixeldur 9
DRM debug in drm_vblank_get: enabling vblank on crtc 0, ret: -22
DRM debug in i9xx_update_primary_plane: Writing base 00060000 00000000 0 0 5120
DRM debug in intel_crtc_mode_set: [ENCODER:7:DAC-7] set [MODE:0:1280x1024]     
DRM debug in i845_get_fifo_size: FIFO size - (0x0000005f) A: 23           
DRM debug in intel_calculate_wm: FIFO entries required for mode: 68
DRM debug in intel_calculate_wm: FIFO watermark level: -47         
DRM debug in i845_update_wm: Setting FIFO watermarks - A: 1
DRM debug in intel_wait_for_vblank: vblank wait timed out  
DRM debug in intel_wait_for_vblank: vblank wait timed out
DRM debug in intel_connector_check_state: [CONNECTOR:6:VGA-1]
DRM debug in check_encoder_state: [ENCODER:7:DAC-7]          
DRM debug in check_crtc_state: [CRTC:5]            
DRM debug in drm_framebuffer_reference: FB ID: 33
wsdisplay0 at intelfb0 kbdmux 1                  
wsmux1: connecting to wsdisplay0
wskbd0: connecting to wsdisplay0
[...]
com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
com0: console                                              
vga0 at isa0 port 0x3b0-0x3df iomem 0xa0000-0xbffff
wsdisplay1 at vga0 kbdmux 1                        
wsmux1: connecting to wsdisplay1
vga0: WARNING: power management not supported
[...]
[startx]
DRM debug in i915_gem_open: 
DRM debug in intel_crtc_cursor_set: cursor off
DRM debug in intel_crtc_set_config: [CRTC:5] [FB:33] #connectors=1 (x y) (0 0)
DRM debug in intel_set_config_compute_mode_changes: computed changes for [CRTC:5], mode_changed=0, fb_changed=0
DRM debug in intel_modeset_stage_output_state: [CONNECTOR:6:VGA-1] to [CRTC:5]
DRM debug in drm_framebuffer_reference: FB ID: 33                             
DRM debug in drm_framebuffer_unreference: FB ID: 33
DRM debug in i915_gem_open:                        
DRM debug in drm_mode_getresources: CRTC[1] CONNECTORS[1] ENCODERS[1]
DRM debug in intel_crtc_cursor_set: cursor off                       
DRM debug in intel_crtc_set_config: [CRTC:5] [FB:33] #connectors=1 (x y) (0 0)
DRM debug in intel_set_config_compute_mode_changes: computed changes for [CRTC:5], mode_changed=0, fb_changed=0
DRM debug in intel_modeset_stage_output_state: [CONNECTOR:6:VGA-1] to [CRTC:5]
DRM debug in drm_framebuffer_reference: FB ID: 33                             
DRM debug in drm_framebuffer_unreference: FB ID: 33
DRM debug in i915_gem_open:                        
DRM debug in intel_crtc_cursor_set: cursor off
DRM debug in intel_crtc_set_config: [CRTC:5] [FB:33] #connectors=1 (x y) (0 0)
DRM debug in intel_set_config_compute_mode_changes: computed changes for [CRTC:5], mode_changed=0, fb_changed=0
DRM debug in intel_modeset_stage_output_state: [CONNECTOR:6:VGA-1] to [CRTC:5]
DRM debug in drm_framebuffer_reference: FB ID: 33                             
DRM debug in drm_framebuffer_unreference: FB ID: 33
DRM debug in i915_gem_open:                        
DRM debug in drm_mode_getresources: CRTC[1] CONNECTORS[1] ENCODERS[1]
DRM debug in drm_mode_getresources: CRTC[1] CONNECTORS[1] ENCODERS[1]
DRM debug in drm_mode_getresources: CRTC[1] CONNECTORS[1] ENCODERS[1]
DRM debug in drm_mode_getconnector: [CONNECTOR:6:?]                  
DRM debug in drm_helper_probe_single_connector_modes: [CONNECTOR:6:VGA-1]
DRM debug in intel_crt_detect: [CONNECTOR:6:VGA-1] force=1               
DRM debug in gmbus_xfer: GMBUS [i915 gmbus vga] NAK for addr: 0050 r(1)
DRM debug in drm_do_probe_ddc_edid: drm: skipping non-existent adapter i915 gmbus vga
DRM debug in intel_crt_get_edid: CRT GMBUS EDID read failed, retry using GPIO bit-banging
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus vga. force bit now 1
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus vga. force bit now 0
DRM debug in intel_crt_detect_ddc: CRT not detected via DDC:0x50 [no valid EDID found]
DRM debug in intel_get_load_detect_pipe: [CONNECTOR:6:VGA-1], [ENCODER:7:DAC-7]
DRM debug in gmbus_xfer: GMBUS [i915 gmbus vga] NAK for addr: 0050 r(1)        
DRM debug in drm_do_probe_ddc_edid: drm: skipping non-existent adapter i915 gmbus vga
DRM debug in intel_crt_get_edid: CRT GMBUS EDID read failed, retry using GPIO bit-banging
DRM debug in intel_gmbus_force_bit: enabling bit-banging on i915 gmbus vga. force bit now 1
DRM debug in intel_gmbus_force_bit: disabling bit-banging on i915 gmbus vga. force bit now 0
DRM debug in intel_crt_detect_ddc: CRT not detected via DDC:0x50 [no valid EDID found]
DRM debug in intel_crt_load_detect: starting load-detect on CRT
[spins here]
[BREAK sent]
fatal breakpoint trap in supervisor mode                      
trap type 1 code 0 eip c02a4044 cs 8 eflags 200202 cr2 dc673000 ilevel 8 esp dad2ef6c
curlwp 0xc3dfd540 pid 168 lid 1 lowest kstack 0xdc7402c0
Stopped in pid 168.1 (Xorg) at  netbsd:breakpoint+0x4:  popl    %ebp
db{0}> bt                                                           
breakpoint(c1012000,3f8,5,c10128c0,7,c10b94a0,c3bf78c8,c3bf7840,c3ac8000,c3e0edc
6) at netbsd:breakpoint+0x4                                                    
comintr(c3bf7788,dc742ca8,0,0,0,0,0,0,0,0) at netbsd:comintr+0x552
--- switch to interrupt stack ---                                 
Xintr_ioapic_edge11() at netbsd:Xintr_ioapic_edge11+0xb5
--- interrupt ---                                       
bus_space_read_4(c3580000,70000,0,1,1,401,0,42903ff,60010,0) at netbsd:bus_space
_read_4+0x13                                                                   
intel_crt_detect(c36b094c,1,6,c108db40,c02e2764,c3561140,6,dc742db4,c0c4f840,c35
6100c) at netbsd:intel_crt_detect+0x98c                                        
drm_helper_probe_single_connector_modes(c36b094c,800,800,c02fab7b,c36b094c,c3561
13c,c4d1df10,c4d1df10,1,2) at netbsd:drm_helper_probe_single_connector_modes+0x2
9b                                                                             
drm_mode_getconnector(c356100c,dc742eb0,c4d1df10,105,c453131c,1000,dc742f68,c04c
64a7,c451f3c0,dc742f3c) at netbsd:drm_mode_getconnector+0x333                  
drm_ioctl(c451f3c0,c04c64a7,dc742eb0,c420e8e0,c420e7e0,c420ea40,0,0,4c,0) at net
bsd:drm_ioctl+0x100                                                            
sys_ioctl(c3dfd540,dc742f68,dc742f60,bb307000,0,c1069ea8,dc742f68,0,0,a) at netb
sd:sys_ioctl+0x198                                                             
syscall() at netbsd:syscall+0x83
--- syscall (number 54) ---     
bb77af77:                  
db{0}> sh reg
ds          dad20010
es          c1000010    cfdata+0x3770
fs          c06a0030    sched_dequeue+0xdd
gs          10                            
edi         c3ac7066
esi         1       
ebp         dad2ef2c
ebx         c3bf7788
edx         100     
ecx         0  
eax         7f
eip         c02a4044    breakpoint+0x4
cs          8                         
eflags      200202
esp         dad2ef2c
ss          10      
netbsd:breakpoint+0x4:  popl    %ebp
db{0}>


I'll have to see about attaching a local disk for swap to try and
capture a crash dump when the console is on video.

>How-To-Repeat:
On i386 (amd64?) machine equipped with i82845G/GL (other i830-series?)
video hardware boot -current and attempt to start Xorg with either
no "xorg.conf" or one which specifies the "intel" driver.

>Fix: