[Bug 107978] [amdgpu] Switching to tty fails with DisplayPort monitor going to sleep (REG_WAIT timeout / dce110_stream_encoder_dp_blank)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107978

--- Comment #7 from Shmerl <shtetldik at gmail.com> ---
I'm using KDE Plasma 5.13.5, current Debian testing x86_64. Can you try it with
Debian? Ubuntu stack is not that close anymore.

I also noticed one detail. When screen mode is chaning (like before sddm comes
up), the monitor goes to sleep briefly and then wakes up. That wasn't happening
before and it's not a correct behavior. In 4.18 it wasn't waking up at all, and
it was fixed in 4.19. Similar thing is happening during switch to tty (screen
mode is changing indicated by the DP monitor icon appearing), except the
monitor isn't waking up anymore.

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