How to check that? I searched the BIOS but couldn't find any FW number. Also i installed Libreelec from scratch and the same result:
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
DP1 disconnected primary (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1920x1080 60.00 + 120.00 100.00 119.88 50.00* 59.94 30.00 25.00 24.00 29.97 23.98
4096x2160 24.00 23.98
3840x2160 30.00 25.00 24.00 29.97 23.98
1920x1080i 60.00 50.00 59.94
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
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
So i'm missing the refresh rates above 30Hz on 4K.
Frans