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

[bugzilla-daemon at freedesktop.org]

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

bordjukov at gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|FIXED                       |---
             Status|CLOSED                      |REOPENED

--- Comment #99 from bordjukov at gmail.com ---
(In reply to Lakshmi from comment #96)
> Workaround for gpu hangs that comes with DMAR ERROR is to add
> intel_iommu=igfx_off kernel option.

Hello Lakshmi,

While use of intel_iommu=igfx_off works around the GPU freeze issues, it has
major drawbacks. For example it makes Intel VT-d _unusable_ with VirtualBox.

Also, stating that a workaround is a fix for a bug is a contradiction IMO. I
still consider that this bug is present and appeal to either keep the issue
open until it has been fixed and the fix has been validated, or state outright
that there will be no fix and VT-d should be considered buggy on Broadwell.

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