Public bug reported:
I have been experiencing an issue only since a week or so, which I have
reportedly also heard from a colleague of mine (2018 Dell XPS 13) since much
longer.
My hardware is a Lenovo Thinkpad L480 with i5-8250u.
When using stock ubuntu 18.04.1, sometimes and sporadically (1 out of 3
or so) after resuming from suspend, the screen would not be locked and
flicker, switching between a fully black screen and the previously
(before going to standby) displayed content, which I regard as a
security issue. The GUI is not responsive, however I can workaround
using ctrl-alt-F1 and login using my password to "semi"-restore
functionality. The flickering is then gone, but e.g. the dock doesn't
respond correctly and my notifications are missing, until I restart
gnome-shell. This then leaves me with a fully functional system again,
which is why I have not regarded my issue the same as other bug reports,
which report a system freeze.
I have tried using gnome-session instead of ubuntu-session for the past
day as of writing this report and have NOT yet experienced the issue
again, so I assume it has something to do with ubuntu's theme or alike.
Please provide information which log files could be helpful and I am
going to try and reproduce the issue on ubuntu-session.
** Affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1813139
Title:
Screen unlocked after resume, black flickering
Status in gnome-shell package in Ubuntu:
New
Bug description:
I have been experiencing an issue only since a week or so, which I have
reportedly also heard from a colleague of mine (2018 Dell XPS 13) since much
longer.
My hardware is a Lenovo Thinkpad L480 with i5-8250u.
When using stock ubuntu 18.04.1, sometimes and sporadically (1 out of
3 or so) after resuming from suspend, the screen would not be locked
and flicker, switching between a fully black screen and the previously
(before going to standby) displayed content, which I regard as a
security issue. The GUI is not responsive, however I can workaround
using ctrl-alt-F1 and login using my password to "semi"-restore
functionality. The flickering is then gone, but e.g. the dock doesn't
respond correctly and my notifications are missing, until I restart
gnome-shell. This then leaves me with a fully functional system again,
which is why I have not regarded my issue the same as other bug
reports, which report a system freeze.
I have tried using gnome-session instead of ubuntu-session for the
past day as of writing this report and have NOT yet experienced the
issue again, so I assume it has something to do with ubuntu's theme or
alike.
Please provide information which log files could be helpful and I am
going to try and reproduce the issue on ubuntu-session.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1813139/+subscriptions
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