[Bug 89143] Internal display goes blank when setting up external monitor as clone

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89143

--- Comment #2 from Milan Bouchet-Valat <nalimilan at club.fr> ---
Created attachment 113496
  --> https://bugs.freedesktop.org/attachment.cgi?id=113496&action=edit
drm.debug=0xe

Here it is.

Actually, I've experimented a bit more, and no consistent pattern appears wrt.
cloned/main/secondary screens. It's just a mess.

I noticed that after disconnecting the external monitor, I could even end up in
a state where I could not get the internal screen to unblank. I had to put the
laptop into suspend mode. Thus it may well be the same bug as
https://bugzilla.kernel.org/show_bug.cgi?id=92241

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