Bug 88844

Summary: GPU hang
Product: DRI Reporter: Teemu <teemual>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED FIXED QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: intel-gfx-bugs
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
GPU crash dump from /sys/class/drm/card0/error none

Description Teemu 2015-01-28 08:20:55 UTC 
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
Comment 1 Teemu 2015-01-28 08:22:51 UTC 
Created attachment 112903 [details]
GPU crash dump from /sys/class/drm/card0/error
Comment 2 Chris Wilson 2015-01-28 08:57:45 UTC 
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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