Here is the same problem in Ubuntu 16.04. By blocking the session, the screen
goes black. By accessing the tty1 and end the process of compiz, you can log in
again.
*-display
Description: VGA compatible controller
Product: Sky Lake Integrated Graphics
Manufacturer: Intel Corporation
Physical ID: 2
Bus information: pci @ 0000: 00: 02.0
Version: 06
width: 64 bits
cat /usr/share/X11/xorg.conf.d/20-intel.conf
Section "Device"
Identifier "Intel Graphics"
Option "DRI" "3"
EndSection
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https://bugs.launchpad.net/bugs/1301125
Title:
Lock screen after idle time freezes unity
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