Re: kern/56761: Kernel hang/freeze on i915 DRM init

[Reinoud Zandijk <reinoud%NetBSD.org@localhost>]

The following reply was made to PR kern/56761; it has been noted by GNATS.

From: Reinoud Zandijk <reinoud%NetBSD.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/56761: Kernel hang/freeze on i915 DRM init
Date: Sat, 19 Mar 2022 15:19:20 +0100

 Another crashdump recovery. I tried setting up DDB in the kernel to give a
 nice dump but to no avail; it completely froze and didn't reboot. This dump
 shows that it panics due to no console device after i915drmkms0 complained
 about 'not finding any crtc or sizes'. My hunch is that it doesn't find a
 display encoder.
 
 Before i915drmkms0 attaches, the video is using acpivga0 that complains:
 [     1.000456] acpivga0: connected output devices:
 [     1.000456] acpivga0:   0x0400 (acpiout15): Unknown Output Device, head 0
 
 The last lines were:
 
 -------------
 [     3.727913] kern.mo`ule.path=/stand-amd64/9.99.94/modules
 [     3.000079] kern info: [drm] Supports vblank timestamp(caching Rev 2
 (21.10.2013).
 [     3.787913] kern info: [drm] Driver supports precise vblank timestamp
 query.
 [     3.790203] i915drmkms0: interrupting at msi5 vec 0 (i915drmkms09
 [     3.790203] kern info: [drm] Initialized i915 1.6.0 20200114 for
 i915drmkms0 on minor 0
 [     3.907913] i915drmkms0: info: [drm] Cannot find any crtc or sizes
 [     3.917912] kern info: [drm] DRM_I915_DEBUG enabled
 [     3.917912] iern info: [drm] DRM_I915_DEBUG_^GEM enabled
 panic: cnopen: no console device
 cpu0: Begin traceback...
 ------------