Try the TearFree option for the kernel driver:
Code: Select all
sudo mkdir -p /etc/X11/xorg.conf.d
sudo tee /etc/X11/xorg.conf.d/10-tearfree.conf <<!
Section "Device"
Identifier "AMD"
Driver "radeon"
Option "TearFree" "true"
EndSection
!
If the desktop won't load afterwards then just delete the file at /etc/X11/xorg.conf.d/10-tearfree.conf to revert to the stock configuration.