Sometimes it stuck my WM (Unity) and I can only move mouse cursor without changing virtual desktops or type anything into application (Emacs, for example). Also, it starts break fonts on my running Firefox pages. I think, the problem is with some pages opened in Firefox after it uses hardware acceleration, it looks so for me. [Ср. сент. 30 14:05:15 2015] - [drm] stuck on render ring [Ср. сент. 30 14:05:15 2015] - [drm] GPU crash dump saved to /sys/class/drm/card0/error [Ср. сент. 30 14:05:15 2015] - [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace. [Ср. сент. 30 14:05:15 2015] - [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel [Ср. сент. 30 14:05:15 2015] - [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue. [Ср. сент. 30 14:05:15 2015] - [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it. I can not attach that file (/sys/class/drm/card0/error), so here is link for it: https://yadi.sk/d/mMafPWrvjREgG
I can repeatedly produce that stuck if opened the webpage: https://openhatch.org/ Here is how it opens every time: https://yadi.sk/i/KCn3UCMwjRFQf
*** This bug has been marked as a duplicate of bug 92167 ***
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