"screens go black" reminds me of bug 1873403 which might be somehow
related.
** Summary changed:
- cannot change main monitor after setting scaling for monitors w/nvidia drivers
+ [nvidia] cannot change main monitor after setting scaling for monitors
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apport information
** Tags added: apport-collected focal package-from-proposed
** Description changed:
After booting with nvidia drivers, if I change which monitor is the main
one first, then change the scaling from 100% to 200%, it works. But
doing this in the inverse direction, by first
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