Similar experience as Emmanuel C (comment #47):
I have been running 14.04 LTS i386 (in different flavours) on two (old)
HP dx5150 each with AMD Athlon 64 and (IGP) ATI RS480. These are used
for development and test. Worked like a charm.
For a new project, I installed 16.04.1 LTS i386 on one of them, and
immediately started having problems with the screen saver not exiting on
Now, I installed 14.04.5 LTS 64bit and the problem seems now to have been
And as Emmanuel describes, no keyboard activity, like Ctrl-Alt-F1, works. The
only things that works is a) restarting lightdm when the problem occurs (using
ssh, if I remember to install it...) and b) setting the idle time for the
screen saver to Never so that the problem does not occur.
I am quite amazed over the longevity of this bug.
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Lock screen after idle time freezes unity
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