Every once in a while (about 2-3 times a day) the screen becomes distorted and freezes completely. CTRL+ALT+F3, CTRL+ALT+BKSPCE are not responding. can only shut off by a long press on the power button. This is installed on a dell laptop (Hardware name: Dell Inc. Latitude E7270/0T0V7J, BIOS 1.3.0 02/14/2016) with intel graphics driver 'intel-microcode 3.20151106.1'. The issue happens about twice a day while laptop is connected to a docking station to 2 screens and laptop screen is open (if that's relevant at all).
Here is what I'm running: Linux Mint 18 Sarah uname -a: Linux tom-wix 4.4.0-31-generic #50-Ubuntu SMP Wed Jul 13 00:07:12 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Here are the only 2 lines of log that appeared before the crash at about 11:35 (may be relevant, thought it doesn't seem so)
Jul 26 11:17:01 tom-wix CRON: (root) CMD ( cd / && run-parts --report /etc/cron.hourly) Jul 26 11:31:43 tom-wix org.gtk.vfs.Daemon: ** (process:7631): WARNING **: Couldn't create directory monitor on smb://x-gnome-default-workgroup/. Error: Operation not supported by backend
I'm suspecting graphics driver issue or something is up with the docking station. How do I debug this? as you can see above, I couldn't find anything very helpful in the logs.