Hi,
I’m running qubes os on a N41 with the USB-C docking station. I have 3 monitors attached to the docking station, but can only activate two of them. I think that might be due to the limitations of the DP 1.4 restrictions, which will not allow enough bandwith to activate two 4k monitors at 60hz.
xrandr produces the following output:
Screen 0: minimum 320 x 200, current 8760 x 3240, maximum 16384 x 16384
eDP-1 connected primary 1920x1080+0+2160 (normal left inverted right x axis y axis) 309mm x 174mm
1920x1080 60.05*+ 60.01 59.97 59.96 59.93
1680x1050 59.95 59.88
1400x1050 59.98
1600x900 59.99 59.94 59.95 59.82
1280x1024 60.02
1400x900 59.96 59.88
1280x960 60.00
1440x810 60.00 59.97
1368x768 59.88 59.85
1280x800 59.99 59.97 59.81 59.91
1280x720 60.00 59.99 59.86 59.74
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
960x540 59.96 59.99 59.63 59.82
800x600 60.00 60.32 56.25
840x525 60.01 59.88
864x486 59.92 59.57
700x525 59.98
800x450 59.95 59.82
640x512 60.02
700x450 59.96 59.88
640x480 60.00 59.94
720x405 59.51 58.99
684x384 59.88 59.85
640x400 59.88 59.98
640x360 59.86 59.83 59.84 59.32
512x384 60.00
512x288 60.00 59.92
480x270 59.63 59.82
400x300 60.32 56.34
432x243 59.92 59.57
320x240 60.05
360x202 59.51 59.13
320x180 59.84 59.32
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 disconnected (normal left inverted right x axis y axis)
HDMI-3 disconnected (normal left inverted right x axis y axis)
DP-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-2 connected 3840x2160+1500+0 (normal left inverted right x axis y axis) 697mm x 392mm
3840x2160 60.00 + 60.00 50.00 59.94 30.00* 25.00 24.00 29.97 23.98 29.98
1920x2160 59.99
2560x1440 59.95
1920x1080 60.00 50.00 59.94
1680x1050 59.88
1280x1024 75.02 60.02
1440x900 59.90
1280x960 60.00
1280x720 60.00 50.00 59.94
1024x768 75.03 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
720x576 50.00
720x480 60.00 59.94
640x480 75.00 72.81 66.67 60.00 59.94
720x400 70.08
DP-1-3 connected 1080x1920+420+240 left (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 59.95 +
1920x1080 60.00* 50.00 59.94
1680x1050 59.95
1600x900 60.00
1280x1024 60.02
1440x900 59.89
1280x800 59.81
1280x720 60.00 50.00 59.94
1024x768 60.00
800x600 60.32 56.25
720x576 50.00
720x480 60.00 59.94
640x480 60.00 59.94
I configured the monitors with:
xrandr --fb 8760x3240 --output eDP-1 --mode 1920x1080 --rate 60.05 --pos 3420x2160 --primary --output DP-1-3 --mode 1920x1080 --rate 60 --pos 3840x240 --rotate left --output DP-1-2 --mode 3840x2160 --rate 30 --pos 4920x0
I think the following line shows, that the display is physically connected with 60hz (+), but only uses 30hz ().
3840x2160 60.00 + 60.00 50.00 59.94 30.00 25.00 24.00 29.97 23.98 29.98
So I think I should be able to get the second 4k display woking if it would look somehow like this:
3840x2160 60.00 60.00 50.00 59.94 30.00*+ 25.00 24.00 29.97 23.98 29.98
Any idea how to get that working?
Kind reagards
Jan