Public bug reported:
When connecting a 4k monitor to the DP port of a Lenovo TBT3 Gen2 dock
and dock is connected to a P17 also with a 4k display if you change the
scale to 100% and attempt to run any window based application like a
browser window on the monitor you get periodic pop up areas of garbage.
Happens more if the window is closer to the left side than if in the
middle of the screen.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1918466
Title:
Garbage window on external 4k display
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