Thanks for the bug report. Please try adding this to /etc/environment:
MUTTER_DEBUG_FORCE_KMS_MODE=simple
and then reboot.
** Summary changed:
- Top margin of secondary monitor covered with black flickering rectangle
+ [nouveau] Top margin of secondary monitor covered with black flickering
rectangle
** Tags added: nouveau
** Package changed: xorg (Ubuntu) => linux (Ubuntu)
** Also affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/2074559
Title:
[nouveau] Top margin of secondary monitor covered with black
flickering rectangle
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https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2074559/+subscriptions
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