This sounds like bug 1873403 and you probably just needed to update the
system:
sudo apt update
sudo apt full-upgrade
Reboot.
Does comment #2 mean the issue is gone for good?
** Tags added: nvidia xrandr-scaling
** Package changed: xorg (Ubuntu) => mutter (Ubuntu)
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
** Summary changed:
- Screen dies/black after changing display orientation or enabling fractional
scaling
+ [nvidia] Screen dies/black after changing display orientation or enabling
fractional scaling
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https://bugs.launchpad.net/bugs/1888065
Title:
[nvidia] Screen dies/black after changing display orientation or
enabling fractional scaling
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