While web browsing, screen went blank and backlight went off as well. Had to do a power cycle after which the system worked fine again. Ubuntu 14.04 on a 2008 MacBook 4.1. GPU: Intel GMA X3100 snippet of dmesg: [ 25.792974] [drm] GPU crash dump saved to /sys/class/drm/card0/error [ 25.792978] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace. [ 25.792979] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel [ 25.792981] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue. [ 25.792982] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it. [ 25.793613] i915: render error detected, EIR: 0x00000010 [ 25.793618] i915: page table error [ 25.793620] i915: PGTBL_ER: 0x00000100 [ 25.793624] [drm:i915_report_and_clear_eir] *ERROR* EIR stuck: 0x00000010, masking [ 25.793667] [drm] initialized overlay support
Created attachment 112903 [details] GPU crash dump from /sys/class/drm/card0/error
That error is unrelated to the GPU hang and display death, and it should be fixed in 3.18+ (the error here relates to keeping the displays active whilst we do the KMS takeover). The hang whilst browsing is a known mesa bug, for which there should be a patch in mesa.git worth testing: commit c4fd0c9052dd391d6f2e9bb8e6da209dfc7ef35b Author: Kenneth Graunke <kenneth@whitecape.org> Date: Sat Jan 17 23:21:15 2015 -0800 i965: Work around mysterious Gen4 GPU hangs with minimal state changes.
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