Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-screensaver (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1685141
Title:
System freezes after locking screen
Status in gnome-screensaver package in Ubuntu:
Confirmed
Bug description:
When locking the screen or whenever the screensaver starts
automatically, I cannot log in again, but my system completely freezes
and I have to restart the computer. In most cases I was able to do the
restart by pressing Alt-REISUB, in some cases however I had to do a
hard reset. This is a new bug in zesty (Ubuntu 17.04). In the previous
version everything worked fine. I tested both the upgrade and a fresh
new installation on the same computer. Package is gnome-screensaver
version 3.6.1-7ubuntu5.
I attach an excerpt from my syslog. Hope this might help to find the
bug.
I installed zesty on another computer (laptop) as well and there the
bug did not appear. So I assume it has something to do with the
installed graphics card or graphics driver. Installed graphics card in
this case is: NVIDIA Corporation GF108 [GeForce GT 630] (rev a1).
Update: After a few days the bug now appears on the second computer as
well. However, I could unlock the screen and continue working, until
suddenly (an hour later or so) the whole system froze. I add the
kernel-nullpointer-dereference syslog of this event (syslog2.txt) to
the attachments for this bug.
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