Screen flickers full black, then comes back on when sound is outputted, i installed 18.04, upgraded to 20.04, then did an update and this started happening: https://youtu.be/fw4JxebwwL8 it stops periodically but then for some reason just comes back on. Its driving me insane, ive reinstalled some x11 stuff, and restarted but it just wont stop. What do i do.

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