On Mon, Jan 2, 2012 at 08:09, Udo Steinberg udo@hypervisor.org wrote:
On Thu, 22 Dec 2011 09:22:33 +0100 Daniel Vetter (DV) wrote:
DV> Can you please apply the patch available at DV> DV> http://cgit.freedesktop.org/~danvet/drm/patch/?id=0b3ecfa8c9b00f50d514fbcc12... DV> DV> This one will let your gpu keep hanging in the "stuck on semphore wait" DV> condition. Later on the hangcheck should kick in and grab a gpu error DV> state (in the file i915_error_state in debugfs). Can you please attach DV> that one?
Hi,
i915_error_state and dmesg are attached. This was with Linux 3.2.0-rc6 and the aforementioned patch applied.
Thanks a lot for gathering the error state. It looks like the semaphore code deadlocked, which should not have happened. Can you please test with the my-next branch available at:
http://cgit.freedesktop.org/~danvet/drm/log/?h=my-next
It contains a few fixes for races (that might cause your issue) and dumps some additional information into the error state. You need to boot with i915.semaphores=1 because they're not enabled by default in that tree.
Again, please attach the error state if the gpu hangs.
Yours, Daniel