https://bugs.kde.org/show_bug.cgi?id=426644

--- Comment #31 from Thorolf E.R. Weißhuhn <t...@gmx.de> ---
(In reply to Thorolf E.R. Weißhuhn from comment #26)
> Additional observation:
> 
> Internal (secondary) screen goes partially black when external hdmi monitor
> is plugged in. A vertical strip of ~1/8 screen width adjoining the active
> screen (no overlap in display settings) shows desktop background. Desktop
> icons (on secondary) absent.
> 
> At other test, open windows on internal secondary displayed, only desktop
> black. 
> 
> Everything displayed as expected after tray Display Configuration switch
> (extend other side, and back).

Please ignore. That seems to be related to screen flicker caused by panel self
refresh, and can be mitigated with kernel parameter `i915.enable_psr=0`.

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