@mladen thank you for your suggestion. I just tried that again. No output at all.
Debugging via ssh:
$ xrandr -display :0.0 -q
Screen 0: minimum 320 x 200, current 4096 x 2160, maximum 16384 x 16384
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 connected primary 4096x2160+0+0 (normal left inverted right x axis y axis) 1600mm x 900mm
4096x2160 30.00* 25.00 24.00 29.97 23.98
3840x2160 30.00 25.00 24.00 29.97 23.98
1920x1080 120.00 100.00 119.88 60.00 50.00 59.94 30.00 25.00 24.00 29.97 23.98
1920x1080i 60.00 50.00 59.94
1280x1024 60.02
1360x768 60.02
1280x720 60.00 50.00 59.94
1024x768 60.00
800x600 60.32
720x576 50.00
720x480 60.00 59.94
640x480 60.00 59.94
720x400 70.08
DP-3 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
What’s weird is that even though I connected the TV via HDMI, xrandr still claims that DP-2 is connected… However, the refresh rate is still at 30Hz.
@mladen I’m curious, what is your setup? Are you at 4096x2160 or 3840x2160 resolution?