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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #100 from stsp at list.ru ---
(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.
> 
> IF gpu hangs for some other reason please file a new bug if there isn't a
> existing bug.
> 
> Closing this bug, as the original issue is resolved with a work around fix.

Unbelievable to hear such thing from an Intel employer.
Please refer to the docs:
https://www.kernel.org/doc/Documentation/Intel-IOMMU.txt
```
Graphics Problems?
------------------
If you encounter issues with graphics devices, you can try adding
option intel_iommu=igfx_off to turn off the integrated graphics engine.
If this fixes anything, please ensure you file a bug reporting the problem.
```

"to turn off the integrated graphics engine" is what the doc says.
"please ensure you file a bug" is what the doc says.

This should be re-opened.

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