[Bug 89360] [bdw-u iommu] DMAR error -> GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89360

--- Comment #41 from Michael Groh <brot+bfdo at minad.de> ---
Hello everyone,

First of all, sorry i forgot to add the comment to the file.

I think am also hitting this bug, i think. The system is a Lenovo ThinkPad X250
- Intel(R) Core(TM) i5-5200U and the HD Graphics 5500.

Since i started using the IOMMU i have been getting hangs and also some X
restarts. This is what dmesg says after the fact:

[ 1409.513438] DMAR: DRHD: handling fault status reg 3
[ 1409.513451] DMAR: [DMA Read] Request device [00:02.0] fault addr f5995000
[fault reason 05] PTE Write access is not set
[ 1409.513468] DMAR: DRHD: handling fault status reg 3
[ 1409.513471] DMAR: [DMA Write] Request device [00:02.0] fault addr f5968000
[fault reason 23] Unknown
[ 1418.830396] [drm] GPU HANG: ecode 8:0:0x85dffffb, in kwin_x11 [2191],
reason: Hang on render ring, action: reset
[ 1418.830407] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[ 1418.830409] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[ 1418.830410] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[ 1418.830412] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[ 1418.830413] [drm] GPU crash dump saved to /sys/class/drm/card0/error

I will upload said crash dump here. If i can provide you with any more
debug-logs or should test something, i would be glad to help.

Thanks,
Michael

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