Johannes,
The problem in comment #6 sounds like a hotplug event, like the whole
HDMI connection was lost and then reconnected.
Next time the problem happens please immediately run:
journalctl -b0 > journal.txt
and attach the resulting text file here.
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1926032
Title:
[i915] Screen "disconnects" when updating screen buffer
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