Re: kern/56672 (i915drmkms hangs on boot)

[Emmanuel Dreyfus <manu%netbsd.org@localhost>]

The following reply was made to PR kern/56672; it has been noted by GNATS.

From: Emmanuel Dreyfus <manu%netbsd.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/56672 (i915drmkms hangs on boot)
Date: Tue, 24 May 2022 08:48:41 +0000

 On Sun, May 22, 2022 at 10:23:34PM +0000, maya%NetBSD.org@localhost wrote:
 > Does this still happen? Can you mention the latest dmesg messages, preferably with `boot -v -x`?
 
 Yes, it still happens, but not with a serial console, hence  I cannot 
 copy/paste the whole output
 
 Here is a case:
 intelfb: framebuffer at 0xc0040000, size 1200x1920, depth 32, srtride 4800
 (hang with black screen until I hit power butten...)
 acpi0: power button pressed, shuttig down!
 (...)
 {drm:netbsd:drm_atomic_helper_wait_for_flip_done+0x1ea} *ERROR*  [CRTC:51:pipe A] flip_done timed out
 
 Another case:
 panic: kernel assertion "(i * BITMAP_SIZE) < pp->pr_itemperpage" failed: file (...) subr_poool.c, line 450
 backtrace show we come from:
 (...)
 kmem_intr_alloc
 drm_client_modeset_probe
 drm_fb_helper_hotplug_event.part.0
 
 It seems to crash less often with -v -x, there must be a lot hangs caused
 by race conditions, because -v -x or serial console cause a huge slowdown.
 
 Without -v -x, I most often hang on:
 i915drmkms0: interrupting at msi5 vec 0 (i9015drmkms0)
 i915drmkms0: notice: Failed to load DNC firmware i915/kbl_dmc_vec1_04.bin: Disabling runtiome power management
 
 
 -- 
 Emmanuel Dreyfus
 manu%netbsd.org@localhost