Created attachment 111963 [details] Content from /sys/class/drm/card0/error Happens before suspend to RAM. I have not observed any misbehaviour as a user. [236243.341582] [drm] stuck on render ring [236243.341624] [drm] GPU crash dump saved to /sys/class/drm/card0/error [236243.341653] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace. [236243.342228] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel [236243.342803] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue. [236243.343399] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
Thanks for the report. Render head indicates it hung in a MI_STORE_DATA_DWORD for semaphore add_request. If possible please give a try on our latest drm-intel-nightly branch from cgit.freedesktop.org/drm-intel, we have few changes there since 3.14. Also, on your current kernel, could you try to reproduce again booting your kernel with drm.debug=0xe and grab dmesg and paste here as well. Also 2 good things to try separated is to boot your kernel with i915.semaphores=0 and i915.enable_rc6=0 and see witch one can fix this hang. Thanks in advance, Rodrigo.
Maybe I'll add "drm.debug=0xe" next time I'll be rebooting my laptop. I have seen the hang only in logs. If I haven't looked into dmesg, it would have come unnoticed. I have only seen it happening once and don't konw how to reproduce it to test "i915.enable_rc6" or "i915.semaphores".
Thanks for the report. I'm closing this bug since the log didn't show much and we cannot reliable reproduce this. Feel free to reopen if it becomes persistent and reproducible. Thanks, Rodrigo.
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