Please try setting the external monitor to a lower resolution like
1920x1080. If the bug then stops happening it would suggest a higher
quality display cable is needed.
** Tags added: multimonitor suspend-resume
** Package changed: xorg (Ubuntu) => linux (Ubuntu)
** Also affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2067143
Title:
‘no signal’ after monitor sleep or monitor turned off
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