Created attachment 111170 [details]
GPU crash dump
I have experienced a desktop freeze during few seconds. System messages relate that to a GPU hang. In what follows, further information, and the GPU crash dump.
* This situation was experienced under Kubuntu vivid (updated on the 22th, december 2014), and compositor mode was enabled on the window manager kwin_x11. (No problem encountered without the compositor mode)
* Linux version is 3.18.0-031800-generic #201412071935 SMP, from Ubuntu repository
* The package used for xserver-xorg-video-intel is from http://ppa.launchpad.net/xorg-edgers/ppa/ubuntu:
* system messages:
[ 3265.604584] [drm] stuck on render ring
[ 3265.606629] [drm] GPU HANG: ecode 0:0x002883e6, in kwin_x11 , reason: Ring hung, action: reset
[ 3265.606640] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
[ 3265.606644] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
[ 3265.606649] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
[ 3265.606653] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
[ 3265.606661] [drm] GPU crash dump saved to /sys/class/drm/card0/error
What version of Mesa are you using (glxinfo | grep 'GL version')? Also, what version of the X server are you using?
This looks an awful lot like a bug we fixed some time back.
Sorry for the delay.
version of Mesa: 10.5.0~git20141210.47aaabda
version of xserver-xorg-core: 18.104.22.1681-1ubuntu3
version of xserver-xorg-video-intel: 2.99.916+git20141215.99537089
Please reopen if you can still reproduce with Mesa 17.0.