[Bug 103076] [v4.13 ARCH] GPU HANG: DMAR: DRHD: handling fault status reg 3 (arch reverted the use of intel_iommu=igfx_off)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103076

--- Comment #45 from Carsten Mattner <carstenmattner at gmail.com> ---
(In reply to Carsten Mattner from comment #44)
> (In reply to Carsten Mattner from comment #43)
> > (In reply to Carsten Mattner from comment #42)
> > > With 4.13.2 entering Xorg and leaving results in a failed atomic flip which
> > > then 2/3 of the time makes it impossible to restart the kernel cleanly.
> > > 
> > > This doesn't happen if a Wayland compositor is used and exited.
> > 
> > It's this atomic error: "flip_done timed out" when you exit Xorg.
> > 
> > There have been other updates in Arch Linux and if I try hard I can
> > reproduce it on 4.9.61 as well now.
> 
> Adding video=SVIDEO-1:d to the kernel cmdline seems to fix the flip_done
> hang.

Ivan, coming back to your suggestion and explicitly enabling semaphores and
disabling framebuffer compression, rc6 sleep mode and (I don't know what it is)
psr, in addition to video=SVIDEO-1:d seems to be working better than the other
tests so far on 4.13.12.

Still testing this:

video=SVIDEO-1:d plymouth.enable=0 i915.semaphores=1 i915.enable_rc6=0
i915.enable_psr=0 intel_iommu=igfx_off

I don't think plymouth.enable=0 is needed on Arch Linux since I think it's a
Red Hat graphical boot system, isn't it? I mean it doesn't hurt and is ignored,
but I had to ask.

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