Great, thank you!
I installed 4.0.9-generic and the problem disappeared :)
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https://bugs.launchpad.net/bugs/1456531
Title:
LightDM (?) blank/white screen after resume from suspend
To
Until there is a fix, could anyone please recommend a workaround for
this?
Every time I suspend my t450s, I estimate there is a 50% probability
that I will have this white screen problem after I wake up. Restarting
my system every time gets annoying...
Thanks a lot!
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