Created attachment 78533 [details]
screenshot of steam showing ColorTiling corruption

current xorg:

#Section "Module"
#       Load "dri2"
#       Load "glamoregl"
#EndSection

Section "Device"
   Identifier "7970"
#   Driver "modesetting"
#    Driver   "ati"
   Driver   "radeon"
#   Driver   "radeonsi"

#   Option   "SWcursor"         "on"
#   Option   "EnablePageFlip"   "on"
   Option   "AccelMethod"      "glamor"
#   Option   "AccelMethod"      "exa"
   Option   "RenderAccel"      "on"
#   Option "SwapbuffersWait" "false"
   Option   "ColorTiling"      "on"
#   Option   "AccelDFS"         "off"
EndSection