[Bug 89360] random system freezes on broadwell-u gpu

[bugzilla-daemon at freedesktop.org]

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

--- Comment #1 from code at stefanjunker.de ---
Short version
---
adding 'intel_iommu=igfx_off' helped


Long version
---
I've tried many things to resolve this issue, from kernel reconfiguration to
installing mesa, libdrm, intel drivers from latest repository masters, which
all didn't help. I reverted back to the most recent releases of the packages.

>From an older forum entry somewhere on the webs I found that this could be
related to virtualization techologies and memory remapping, so I added the
following arguments to my kernel commandline: 'intel_iommu=igfx_off'

Ever since (about 10-15 hours of very active usage) I haven't had a single
freeze.

I still think this is not normal behavior, since turning off iommu for the GPU
can't be the right or necessary thing to do.

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