[Intel-gfx] Hangcheck does not work on SNB?

[Chris Wilson]

On Mon, 2 Apr 2012 10:12:31 +0200, Lukas Hejtmanek <xhejtman at ics.muni.cz> wrote:
> On Mon, Apr 02, 2012 at 08:32:50AM +0100, Chris Wilson wrote:
> > Even after you stop the video? All it sounds like so far is that it is no
> > longer rendering video frames. Also check your Xorg.log and video player
> > for diagnostics.
> 
> Xorg.log contains (however this may be consequence of SAK (sysrq-k)):
> 
> [157714.590] 10: /usr/lib/x86_64-linux-gnu/libdrm.so.2 (drmIoctl+0x28) [0x7f57cdaf11a8]
> [157714.590] 11: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f57cd5fa000+0x374ee) [0x7f57cd6314ee]
> [157714.590] 12: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f57cd5fa000+0x6789a) [0x7f57cd66189a]
> [157714.590] 13: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f57cd5fa000+0x42bca) [0x7f57cd63cbca]
> [157714.590] 14: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7f57cd5fa000+0x55dee) [0x7f57cd64fdee]
> [157714.590] 15: /usr/bin/X (BlockHandler+0x4a) [0x7f57d132c51a]
> 
> And I am unable to stop the video, X session is completely dead so I don't
> even see if and what mplayer complains about.
> 
> It seems that the video suddenly slows down and then stops completely but I am
> not 100% sure about this.

Ok, this sounds more like a silent GPU death. We'll have to hit the
manual reset and see whether we can glean any useful info:

  echo 1 > /sys/kernel/debug/dri/0/i915_wedged

But before you do, can you have a quick look with intel_gpu_top and see
if it detects any activity?
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre