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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #84 from Yves-Alexis <corsac at debian.org> ---
(In reply to Jani Saarinen from comment #83)
> Reporter, can you test with latest drm-tip that is now on 4.17.0-rc5

I just tried and after a while (system docked with external screen configured,
and some vtswitch because lightdm) I had a freeze. Looking at kern.log I have:

May 17 18:01:22 scapa kernel: [14619.773523]
[drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe C FIFO underrun
May 17 18:01:25 scapa kernel: [14622.309074]
[drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B FIFO underrun

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