AMD Catalyst

267 bytes added, 22:21, 2 March 2015
Added a second remedy for a possible cause of this bug
Option "XAANoOffscreenPixmaps" "true"
to the 'Device' section of your xorg.conf file.
Also, make sure you have a [[Polkit#Authentication agent|polkit authentication agent]] installed and running, as this behavior can happen when a program is asking for a password, but doesn't have an authentication agent installed to display the password dialog box.
=== 30 FPS / Tear-Free / V-Sync bug ===