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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #25 from Josh Glover <jmglov at gmail.com> ---
I have the same problem, and Google Chrome (as in the binary release, not
Chromium) seems to trigger it. Disabling 3D rendering in X has helped, as now I
get a crash and hang every couple of weeks instead of around once a day.

Here's my uname output, in case it helps:

Linux laurana 4.0.5-gentoo #5 SMP Tue Sep 22 09:45:32 CEST 2015 x86_64 Intel(R)
Core(TM) i7-5600U CPU @ 2.60GHz GenuineIntel GNU/Linux

I'll try the 'intel_iommu=igfx_off' kernel option and see if that improves
matters. Failing that, I'll disable VT-d, unless it is required by Docker.

If I can provide any helpful info, please let me know and I'll be happy to do
so.

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