This log message may have been relevant:
Failed to use stored monitor configuration: Invalid mode 1024x768
(59.999) for monitor 'unknown unknown'
which is related to your old ~/.config/monitors.xml that mentions:
<monitor>
<monitorspec>
<connector>None-1</connector>
<vendor>unknown</vendor>
<product>unknown</product>
<serial>unknown</serial>
</monitorspec>
<mode>
<width>1024</width>
<height>768</height>
<rate>59.999</rate>
</mode>
</monitor>
I don't know what a "None-1" connector is. Certainly a reinstall (or
just deleting ~/.config/monitors.xml) might solve that.
Can you still reproduce any problem?
** Package changed: gnome-shell (Ubuntu) => mutter (Ubuntu)
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2073499
Title:
The whole desktop lagged at rendering even though memory is barely
used.
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