[Bug 201015] [amdgpu] BUG: unable to handle kernel NULL pointer dereference on resume with 2 monitors (vega)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=201015

--- Comment #7 from Aleksandr Mezin (mezin.alexander at gmail.com) ---
(In reply to Nicholas Kazlauskas from comment #6)
> I'd imagine you're probably running GNOME on Wayland from that setup
> environment.
> 
> The patch seems to fix the null pointer deference but you're probably
> getting a black screen from those failed atomic commits.
> 
> Might not be a problem with the driver but with the GNOME Wayland
> implementation - I would need to do more investigation to see which atomic
> commits are failing and if the failures are valid (but unchecked).
> 
> You would probably not see this occur for GNOME over Xorg.

No, it occurs with Gnome on Xorg, with modesetting driver. Gnome on Wayland
seems to handle suspend and resume fine (even on unpatched 4.19-rc3). Also, I
tried xf86-video-amdgpu. It works like Gnome on Wayland, but sometimes after
resume one display is limited to 800x600 resolution only (it's a 4k display).
Probably another different issue.

I expected modesetting driver to work though.

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