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Hi
I have 1x 1680x1050, 1x 1920x1080 and 1x 3840x2160 monitor connected to this Dock. This type of dock is basically just a DisplayPort 1.4 MST Hub with a bunch of USB peripherals next to it. On Windows all 3 Monitors run in those resolutions @60. On Linux I can't get this Setup to work. Most of the time just the 1680x1050 and 1920x1080 monitor work. The 3840x2160 monitor stays black.
Sometimes I can get the 1680x1050 and 3840x2160@30 to work. But in that case, the 1920x1080 stays black. I can switch the configuration with gnome settings. But it reverts if I try to activate 3 monitors.
Another monitor configuration with 2x 1920x1080 + 1x 1680x1050 monitor works fine on Linux. But as soon as I introduce the 4k screen it acts weird.
I already looked into the thread here https://bbs.archlinux.org/post.php?tid=259408 and tried to run the xrandr commands from drizz1e to run the 4k screen @50, unfortunately without any luck. I think his issue is different as it looks more like an edid issue and my issue is a bandwidth issue between computer and dock or something like that.
xrandr with 4k + 1680x1050 monitor:
Screen 0: minimum 320 x 200, current 5520 x 2160, maximum 16384 x 16384
eDP connected (normal left inverted right x axis y axis)
1920x1080 60.03 +
1680x1050 60.03
1280x1024 60.03
1440x900 60.03
1280x800 60.03
1280x720 60.03
1024x768 60.03
800x600 60.03
640x480 60.03
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
DisplayPort-3 disconnected (normal left inverted right x axis y axis)
DisplayPort-4 disconnected (normal left inverted right x axis y axis)
DisplayPort-5 connected (normal left inverted right x axis y axis)
1920x1080 60.00 +
1680x1050 59.88
1280x1024 75.02
1440x900 74.98 59.90
1280x960 60.00
1280x800 59.91
1152x864 75.00
1280x720 60.00
1024x768 75.03 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
640x480 75.00 72.81 66.67 59.94
720x400 70.08
DisplayPort-6 connected 3840x2160+1680+0 (normal left inverted right x axis y axis) 597mm x 336mm
3840x2160 60.00 + 29.56*
2560x1440 59.95
2048x1280 59.92
2048x1152 60.00
1920x1200 59.88
1920x1080 60.00 60.00 50.00 59.94 24.00 23.98
1600x1200 60.00
1680x1050 59.95
1280x1024 75.02 60.02
1280x800 59.81
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
nm 50.00
DisplayPort-7 connected primary 1680x1050+0+0 (normal left inverted right x axis y axis) 473mm x 296mm
1680x1050 59.95*+
1600x1200 60.00
1280x1024 60.02
1440x900 59.90
1280x960 60.00
1024x768 60.00
800x600 60.32
640x480 59.94
720x400 70.08 xrandr with 1680x1050 + 1920x1080:
Screen 0: minimum 320 x 200, current 7440 x 2160, maximum 16384 x 16384
eDP connected (normal left inverted right x axis y axis)
1920x1080 60.03 +
1680x1050 60.03
1280x1024 60.03
1440x900 60.03
1280x800 60.03
1280x720 60.03
1024x768 60.03
800x600 60.03
640x480 60.03
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
DisplayPort-3 disconnected (normal left inverted right x axis y axis)
nm 50.00
DisplayPort-4 disconnected (normal left inverted right x axis y axis)
DisplayPort-5 connected 1920x1080+1680+0 (normal left inverted right x axis y axis) 478mm x 269mm
1920x1080 60.00*+
1680x1050 59.88
1280x1024 75.02
1440x900 74.98 59.90
1280x960 60.00
1280x800 59.91
1152x864 75.00
1280x720 60.00
1024x768 75.03 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
640x480 75.00 72.81 66.67 59.94
720x400 70.08
DisplayPort-6 connected (normal left inverted right x axis y axis)
3840x2160 60.00 + 29.56
2560x1440 59.95
2048x1280 59.92
2048x1152 60.00
1920x1200 59.88
1920x1080 60.00 60.00 50.00 59.94 24.00 23.98
1600x1200 60.00
1680x1050 59.95
1280x1024 75.02 60.02
1280x800 59.81
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
nm 50.00
DisplayPort-7 connected primary 1680x1050+0+0 (normal left inverted right x axis y axis) 473mm x 296mm
1680x1050 59.95*+
1600x1200 60.00
1280x1024 60.02
1440x900 59.90
1280x960 60.00
1024x768 60.00
800x600 60.32
640x480 59.94
720x400 70.08 Offline
This works now on Kernel 5.14.0-rc1-1-mainline. Will switch to Archlinux Kernel again when it is 5.14 and test it there then.
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