[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 #28 from Carsten Mattner <carstenmattner at gmail.com> ---
(In reply to Carsten Mattner from comment #25)
> Been trying to provoke it under two different Wayland compositors for
> several hours (same workload as yesterday), and it seems much harder to
> trigger there (same drm-tip kernel).

Despite the familiar PF_MEMALLOC fault, after having run Wayland compositor
for 3+ hours, and having switched to Xorg after that, no reboot inbetween,
I still haven't hit the hang yet. Uneducated speculation would be that using
Wayland first after boot put the stack in a more forgiving state and increased
the time and operations needed for it to trigger. Wayland was run natively
via its drm backend.

I'll reboot soon for other reasons, but if Wayland manages to hide the drm
regression, I might have to use it as the main daily driver, although there's
no drop-in replacement for my usual X11 window manager environment (yet).

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