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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #14 from Matthias Nagel <matthias.h.nagel at gmail.com> ---
I found the same problem as in comment #4. If I disable VT-d in the BIOS the
crashes disappear. But then I get random segmentation faults from GCC if I try
to compile QtWebKit (N.b: I have gentoo and compile all packages by myself.)
Hence, I have two options

(1) Disable VT-d for daily work such that i915 does not crash
(2) Enable VT-d and only boot into text console mode if I need to compile
QtWebKit

My hardware is

Lenovo Thinkpad X1 Carbon (3rd generation, type 20BT)
Processor Intel Core i5-5200U
Memory: 8 GB PC3-12800L
BIOS: Phoenix, ver. 1.09, 7/22/2015

Interestingly, MemTest86 does not report any memory error in either case (with
and without VT-d)

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