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Could you please provide more information?
Please boot into the Ubuntu kernel and run the following command in a terminal
to collect debugging information and attach it to this report.
$ sudo apport-collect 2171958
** Changed in: linux-hwe-7.0 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2171958
Title:
pink/magenta artefacts at bottom of external USB-C DisplayPort monitor
above 60 Hz on Radeon 860M (DCN 3.5)
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