Sounds like the timings of the current display mode are changing, which controls the placement of the display signal relative to the physical screen. And SDL2 apps might be changing the display mode while they are full screen. Unlocking the screen also involves a display "mode set".
If you set the monitor to a lower resolution or refresh rate, does it prevent the bug at least? -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/2074559 Title: [nouveau] Top margin of secondary monitor covered with black flickering rectangle To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2074559/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
