Thanks for the bug report. Next time the problem happens, please run:
journalctl -b0 > journal.txt
and attach the resulting text file here.
It sounds like the problem is confined to the Nvidia driver. Usually the
HDMI port is wired to the discrete GPU so you can avoid problems with
that by plugging all monitors into the integrated GPU using USB-C
cables. Apps are still able to run on the Nvidia GPU internally.
** Tags added: multimonitor nvidia x11
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
** Also affects: nvidia-graphics-drivers-550 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: nvidia-graphics-drivers-550 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2107597
Title:
External monitor freezes intermittently
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