https://askubuntu.com/questions/896971/problem-with-display-after-
suspending
It looks like a NVIDIA bug.
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https://bugs.launchpad.net/bugs/1792798
Title:
gdm3 will sta
screenshot of how it looks like right after powering it on from
suspend/sleep mode. (tty2)
** Attachment added: "screenshot of how it looks like right after powering it
on from suspend/sleep mode. (tty2)"
https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1792798/+attachment/5189770/+files/4