Seems something is going wrong with intel hardware the last month or so:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=859639
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=884001
Apparently switching to use the intel driver (instead of modeset) did
not fix anything, just made it worse.
What seems to cause the issue is using Firefox + having a second
instance of Firefox open (using a "Dev" profile, I use this for web
development work) + having a private browsing
I've reported a similar issue here
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=859639
Having the same problems here on a Lenovo T520. It used to happen only
if I had the internal screen and an external monitor both active. Now it
happens randomly with only and external monitor hooked up since the
upgrade to 4.9.0-4-amd64 #1 SMP Debian 4.9.65-3 (2017-12-03) x86_64
GNU/Linux.
I
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