[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 #46 from Carsten Mattner <carstenmattner at gmail.com> ---
(In reply to Carsten Mattner from comment #45)
> (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.

It took almost 19 hours, but I was able to provoke the RCS0 hang.
The flags seem to certainly hide the regression(s) well enough
that one might possibly get a work day's worth of use of intel-drm,
if one follows a strict reboot once or twice a day routine.

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