https://bugs.freedesktop.org/show_bug.cgi?id=102300
--- Comment #6 from fayn@mt2015.com --- Section "Device" Identifier "Radeon R9 285" Driver "amdgpu" Option "AccelMethod" "glamor" Option "DRI" "3" Option "TearFree" "on" Option "ColorTiling" "on" Option "ColorTiling2D" "on" EndSection
This was all in 20-amdgpu.conf originally, doesn't matter if I add monitors+screen or not. I have to run these commands after every restart, or no signal:
xrandr --newmode "mymode" 148.35 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync xrandr --addmode DVI-I-1 mymode xrandr --output DVI-I-1 --right-of DVI-D-0 --mode mymode