Re: X broken after upgrade to 9.0

[maya%NetBSD.org@localhost]

On Tue, Mar 03, 2020 at 10:15:06PM +0100, Jörn Clausen wrote:
> Hi!
> 
> I just upgraded my NetBSD desktop machine (ASRock mainboard with
> Celeron J1900 CPU) from 8.1/adm64 to 9.0. It ran X11 without any
> problems before, but now I have glitches. Lines of pixels are not
> updated correctly, as if parts of the screen are constantly XORed.
> It's hard to describe...
> 
> The onboard graphics seems to be detected correctly:
> 
> Mar  3 21:40:51 itix /netbsd: [   7.7395065] i915drmkms0: interrupting
> at ioapic0 pin 16 (i915drmkms0)
> Mar  3 21:40:51 itix /netbsd: [   7.8195601] intelfb0 at i915drmkms0
> Mar  3 21:40:51 itix /netbsd: [   7.8295675] intelfb0: framebuffer at
> 0xffffa200636dc000, size 1280x1024, depth 32, stride 5120
> 
> A little bit later in /var/log/messages, this pops up:
> 
> Mar  3 21:39:58 itix /netbsd: [  34.0453419] kern info: [drm] stuck on
> blitter ring
> Mar  3 21:39:58 itix /netbsd: [  34.0453419] kern info: [drm] GPU
> HANG: ecode 7:2:0x96fbfff7, reason: Ring hung, action: reset
> Mar  3 21:39:58 itix /netbsd: [  34.0453419] kern error:
> [drm:(/usr/src/sys/external/bsd/drm2/dist/drm/i915/i915_gem.c:3196)i915_context_is_banned]
> *ERROR* gpu hanging too fast, banning!
> Mar  3 21:39:58 itix /netbsd: [  34.0653569] 000125a8 :  00000230
> Mar  3 21:39:58 itix /netbsd: [  34.0653569] 000125ac :  00000000
> Mar  3 21:39:58 itix /netbsd: [  34.0653569] 000125b0 :  00000220
> Mar  3 21:39:58 itix /netbsd: [  34.0653569] 000125b4 :  00000000
> Mar  3 21:39:58 itix /netbsd: [  34.0653569] 000125b8 :  0000026e
> 
> I also saw something about "i915 GPU crashed, file a bug report" for a
> brief moment in the console window of XDM, just before logging in. I
> can't find it in any of the files in /var/log/, so I am not even sure
> about the full text or who I am supposed to contact.
> 
> Any idea how to fix this? Should I give modular X from pkgsrc a try?
> 
> -- 
> Joern Clausen
> https://www.oe-files.de/photography/

One way to workaround some of these issues is to force the less
demanding uxa accel method for i915, modesetting driver, or wsfb driver.
e.g. an xorg.conf like this:

Section "Device"
  Identifier "Intel Graphics"
  Driver "intel"
  Option "AccelMethod" "uxa"
EndSection