Thanks for the bug report. These log messages look relevant:
[118317.782940] jarek-Inspiron gnome-shell[3471]: Window manager warning:
Configuring CRTC 79 with mode 1881 (1920 x 1200 @ 59,950172) at position 0, 0
and transform 0 failed
[118319.278873] jarek-Inspiron gnome-shell[3471]:
meta_display_get_monitor_in_fullscreen: assertion 'monitor >= 0 && monitor <
n_logical_monitors' failed
and
[94391.010815] jarek-Inspiron gnome-shell[3471]: Window manager warning:
Configuring CRTC 79 with mode 1881 (1920 x 1200 @ 59,950172) at position 0, 0
and transform 0 failed
[94391.490646] jarek-Inspiron gnome-shell[3471]:
meta_display_get_monitor_in_fullscreen: assertion 'monitor >= 0 && monitor <
n_logical_monitors' failed
Can you please reproduce the problem again and then run 'journalctl -b0'
to see if the same error messages occur during the flicker?
** Tags added: multimonitor
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
** Package changed: gnome-shell (Ubuntu) => mutter (Ubuntu)
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https://bugs.launchpad.net/bugs/2023647
Title:
Screens go into flicker cycle after going blank with external
monitor(s)
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