Flickering screen, maybe when your mouse cursor is at a particular position on the screen?
This was a fix for my Intel 620 graphics card. The patch can be applied to the Live system and then logging off and back on again.
FIXING SCREEN FLICKER INTEL HD520 & 620 GRAPHICS CARDS
At /usr/share/X11/xorg.conf.d/ Create a file
At /etc/X11/xorg.conf.d/ Create a file
You should name your file.conf: 20-intel_flicker_fix.conf
And place the following inside:
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "TripleBuffer" "true"
Option "TearFree" "true"
EndSection
Log off and back on again (live session) or reboot (installed).
Edited to reflect advice from @ReillyBrogan