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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #98 from Yves-Alexis <corsac at debian.org> ---
(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.

Hi Lakshmi,

we know about igfx_off since a long time, but it's not a fix, it's a
workaround. We were told the bug was *fixed* in recent kernels (4.18+), but it
doesn't seem to be the case, at least on Broadwell.

> Closing this bug, as the original issue is resolved with a work around fix.

I have to admit I'm disappointed by this. Not surprised though, I was kind-of
expecting this, it's just took quite a lot of time to finally admit there would
be no software fix.

I was told the same for my i7-640LM, is there a chance DMAR will one day work
fine with iGPU or should be enforce igfx_off by default in the Linux kernel?

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