disappearing display in 4.99.72

[Amitai Schlair <schmonz%schmonz.com@localhost>]

Just to see if there were any obvious post-4.0 problems lurking in - 
current, I test-booted the most recent autobuilt kernel from HEAD on  
my mini. It booted multiuser but stopped driving the display (a 15"  
LCD, Dell E152FPc) partway through hardware detection -- presumably  
right around the time video is configured. Here's the dmesg:

Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,  
2005,
    2006, 2007, 2008
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 4.99.72 (GENERIC) #0: Tue Sep  2 06:03:22 UTC 2008
	builds%b0.netbsd.org@localhost:/home/builds/ab/HEAD/macppc/200809010000Z-obj/ 
home/builds/ab/HEAD/src/sys/arch/macppc/compile/GENERIC
total memory = 512 MB
avail memory = 486 MB
timecounter: Timecounters tick every 10.000 msec
found openpic PIC at 80040000
OpenPIC Version 1.2: Supports 4 CPUs and 64 interrupt sources.
bootpath: /pci@f4000000/ata-6@d/disk@0:0/netbsd.current
mainbus0 (root)
cpu0 at mainbus0: 7447A (Revision 1.2), ID 0 (primary)
cpu0: HID0 8450c0bc<EMCP,EICE,NAP,DPM,ICE,DCE,SGE,BTIC,FBIOB,ABE,BHT>,  
powersave: 1
cpu0: 1500.00 MHz, 512KB L2 cache no parity parity enabled
memory0 at mainbus0len: 128

spdmem0 at memory0
spdmem0: DDR SDRAM memory, no parity or ECC, 512MB, 400MHz, PC-3200
spdmem0: 13 rows, 10 cols, 2 ranks, 4 banks/chip, 5.0ns cycle time
spdmem0: voltage SSTL 2.5V, refresh time 7.8us (self-refreshing)
uni_n0 at mainbus0 address 0xf8000000
hw-clock at uni_n0 not configured
ki2c0 at uni_n0 address 0xf8001000
iic1 at ki2c0: I2C bus
cereal at ki2c0 address 0x1c0 not configured
uninorth0 at mainbus0
pci0 at uninorth0 bus 0
pci0: i/o space, memory space enabled
pchb0 at pci0 dev 11 function 0
pchb0: Apple Computer UniNorth AGP Bridge (rev. 0x00)
radeonfb0 at pci0 dev 16 function 0: ATI Technologies Radeon 9200 5962
radeonfb0: Video BIOS not present
radeonfb0: No video BIOS, using default clocks
radeonfb0: refclk = 27.000 MHz, refdiv = 12 minpll = 125000, maxpll =  
350000
radeonfb0: using static EDID
max_dotclock according to supported modes: 78800
radeonfb0: using static EDID
max_dotclock according to supported modes: 78800
radeonfb0: 64 MB aperture at 0x98000000, 64 KB registers at 0x90000000
radeonfb0: display 0: initial virtual resolution 1024x768 at 32 bpp
radeonfb0: port 0: physical 1024x768 60Hz
radeonfb0: port 1: physical 1024x768 60Hz
init engine
wsdisplay0 at radeonfb0 kbdmux 1: console (fb, vt100 emulation)
wsmux1: connecting to wsdisplay0
drm at radeonfb0 not configured
uninorth1 at mainbus0
pci1 at uninorth1 bus 0
pci1: i/o space, memory space enabled
pchb1 at pci1 dev 11 function 0
pchb1: Apple Computer UniNorth Host-PCI Bridge (rev. 0x00)
Broadcom BCM4318 AirForce One 54g (miscellaneous network, revision  
0x02) at pci1 dev 18 function 0 not configured
obio0 at pci1 dev 23 function 0: addr 0x80000000
zsc0 at obio0: irq 22,23
zstty0 at zsc0 channel 0
zstty1 at zsc0 channel 1
snapper0 at obio0 offset 0x10000: irq 30,1,2
pmu0 at obio0 offset 0x16000 irq 47:  rev. 85
pmu0: initializing IIC bus
pmu0: initializing RTC
pmu0: power-mgt not configured
pmu0: pmu-pwm-fans not configured
ki2c1 at obio0
iic2 at ki2c1: I2C bus
cereal at ki2c1 address 0x1c0 not configured
wdc0 at obio0 offset 0x20000 irq 24, level triggered: DMA transfer
atabus0 at wdc0 channel 0
snapper0: software codec
audio0 at snapper0: full duplex
ohci0 at pci1 dev 24 function 0: Apple Computer Intrepid USB  
Controller (rev. 0x00)
ohci0: can't map mem space
ohci1 at pci1 dev 25 function 0: Apple Computer Intrepid USB  
Controller (rev. 0x00)
ohci1: can't map mem space
ohci2 at pci1 dev 26 function 0: Apple Computer Intrepid USB  
Controller (rev. 0x00)
ohci2: interrupting at irq 29
ohci2: OHCI version 1.0, legacy support
usb0 at ohci2: USB revision 1.0
ohci3 at pci1 dev 27 function 0: NEC USB Host Controller (rev. 0x43)
ohci3: interrupting at irq 63
ohci3: OHCI version 1.0
usb1 at ohci3: USB revision 1.0
ohci4 at pci1 dev 27 function 1: NEC USB Host Controller (rev. 0x43)
ohci4: interrupting at irq 63
ohci4: OHCI version 1.0
usb2 at ohci4: USB revision 1.0
ehci0 at pci1 dev 27 function 2: NEC USB Host Controller (rev. 0x04)
ehci0: interrupting at irq 63
ehci0: EHCI version 1.0
ehci0: companion controllers, 3 ports each: ohci3 ohci4
usb3 at ehci0: USB revision 2.0
uninorth2 at mainbus0
pci2 at uninorth2 bus 0
pci2: i/o space, memory space enabled
pchb2 at pci2 dev 11 function 0
pchb2: Apple Computer UniNorth Host-PCI Bridge (rev. 0x00)
wdc1 at pci2 dev 13 function 0: interrupting at irq 39
atabus1 at wdc1 channel 0
fwohci0 at pci2 dev 14 function 0: Apple Computer UniNorth Firewire  
(rev. 0x81)
fwohci0: interrupting at irq 40
fwohci0: OHCI version 1.10 (ROM=0)
fwohci0: No. of Isochronous channels is 8.
fwohci0: EUI64 00:14:51:ff:fe:16:86:bc
fwohci0: Phy 1394a available S400, 2 ports.
fwohci0: Link S400, max_rec 2048 bytes.
ieee1394if0 at fwohci0: IEEE1394 bus
fwip0 at ieee1394if0: IP over IEEE1394
fwohci0: Initiate bus reset
gem0 at pci2 dev 15 function 0: Apple Computer GMAC Ethernet (rev. 0x80)
gem0: interrupting at irq 41
bmtphy0 at gem0 phy 0: BCM5221 10/100 media interface, rev. 4
bmtphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
gem0: Ethernet address 00:14:51:16:86:bc, 10KB RX fifo, 4KB TX fifo
biomask 8001ffe netmask 8001ffe ttymask 8001ffe
timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
timecounter: Timecounter "mftb" frequency 41600571 Hz quality 100
fwohci0: BUS reset
fwohci0: node_id=0xc800ffc1, gen=2, CYCLEMASTER mode
ieee1394if0: 2 nodes, maxhop <= 1, cable IRM = 1 (me)
ieee1394if0: bus manager 1 (me)
uhub0 at usb0: Apple Computer OHCI root hub, class 9/0, rev 1.00/1.00,  
addr 1
uhub0: 2 ports with 2 removable, self powered
uhub1 at usb1: NEC OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 3 ports with 3 removable, self powered
uhub2 at usb2: NEC OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
uhub3 at usb3: NEC EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub3: 5 ports with 5 removable, self powered
atapibus0 at atabus1: 2 targets
cd0 at atapibus0 drive 1: <MATSHITADVD-R   UJ-845, , D8PB> cdrom  
removable
cd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 4 (Ultra/66)
wd0 at atabus1 drive 0: <ST9808211A>
wd0: drive supports 16-sector PIO transfers, LBA addressing
wd0: 76319 MB, 155061 cyl, 16 head, 63 sec, 512 bytes/sect x 156301488  
sectors
wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100)
wd0(wdc1:0:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/ 
100) (using DMA)
cd0(wdc1:0:1): using PIO mode 4, DMA mode 2, Ultra-DMA mode 4 (Ultra/ 
66) (using DMA)
ieee1394if0: New S400 device ID:00d04b5a1808466d
sbp0 at ieee1394if0: SBP-2/SCSI over IEEE1394
scsibus0 at sbp0: 1 target, 0 luns per target
sd0 at scsibus0 target 0 lun 0: <LaCie Gr, LaCie mini HD, 0102>  
simplified direct fixed
sd0: 78533 MB, 78533 cyl, 64 head, 32 sec, 512 bytes/sect x 160836480  
sectors
uhidev0 at uhub0 port 1 configuration 1 interface 0
uhidev0: Apple Computer product 0x1000, rev 2.00/19.65, addr 2, iclass  
3/1
ukbd0 at uhidev0
wskbd0 at ukbd0 mux 1
wskbd0: connecting to wsdisplay0
uhidev1 at uhub0 port 1 configuration 1 interface 1
uhidev1: Apple Computer product 0x1000, rev 2.00/19.65, addr 2, iclass  
3/1
ums0 at uhidev1: 5 buttons
wsmouse0 at ums0 mux 0
Kernelized RAIDframe activated
uhub4 at uhub2 port 1: Mitsumi Electric Hub in Apple Extended USB  
Keyboard, class 9/0, rev 1.10/3.95, addr 2
uhub4: 3 ports with 2 removable, bus powered
boot device: wd0
root on wd0a dumps on wd0b
root file system type: ffs
uhidev2 at uhub4 port 3 configuration 1 interface 0
uhidev2: Mitsumi Electric Apple Extended USB Keyboard, rev 1.10/3.95,  
addr 3, iclass 3/1
ukbd1 at uhidev2
wskbd1 at ukbd1 mux 1
wskbd1: connecting to wsdisplay0
uhidev3 at uhub4 port 3 configuration 1 interface 1
uhidev3: Mitsumi Electric Apple Extended USB Keyboard, rev 1.10/3.95,  
addr 3, iclass 3/0
uhidev3: 3 report ids
uhid0 at uhidev3 reportid 2: input=1, output=0, feature=0
uhid1 at uhidev3 reportid 3: input=3, output=0, feature=0
wsdisplay0: screen 1 added (fb, vt100 emulation)
wsdisplay0: screen 2 added (fb, vt100 emulation)
wsdisplay0: screen 3 added (fb, vt100 emulation)
wsdisplay0: screen 4 added (fb, vt100 emulation)
Accounting started