I experienced this issue (or something similar) yesterday. I used the
alt-sysrq-1 and alt-sysrq-t combo mentioned in the document linked to in
the last comment and after sometime the machine started responding
again. I captured the kern.log and will attach it here in case it's
useful.
** Attachmen
Public bug reported:
Quite frequently when I lock my screen (or it locks itself) and I unlock
it the system is responsive for a few seconds but then completely
freezes. I can't reboot but have to turn off the power on the machine.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+1
I meant to note that when this occurs I can no longer access my
applications in the Unity bar but can alt-tab and select them to access
them. Otherwise, the only means I've found to address this is to log out
and back in.
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lsb-release:
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04 LTS"
syslog:
compiz: pam_ecryptfs: seteuid error
** Tags added: xenial
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*** This bug is a duplicate of bug 1542720 ***
https://bugs.launchpad.net/bugs/1542720
I cannot access bug #1542720.
I continue to have issues with my system freezing upon returning from
using the screen saver.
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