Force the intel driver over the default modesetting
Make this text file
with this content:
Section "Device" Identifier "Intel Graphics" Driver "intel" # Option "AccelMethod" "uxa" #could also use the default "sna" Option "TearFree" "true" EndSection
Change acceleration method
The intel graphics driver can sometimes cause various window artifacts such as seemingly corrurpted text and screen tearing. This can be caused by the default acceleration method, called sna (sandy bridge new acceleration)
One alternative, especially on older intel chipsets, is to use the older acceleration method, uxa.