Next time the problems happens and the LG is only running at 30Hz,
please run:
sudo apt install drm-info
drm_info > drminfo.txt
and attach the resulting text file here.
This will tell us if the 30Hz limit is coming from the kernel and
therefore it's either a kernel bug or a hardware problem in re-detecting
the monitor.
** Package changed: mutter (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2033647
Title:
External monitor lowered to 30Hz when resuming from suspend
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