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#1 2021-07-12 01:25:40

kilobytech
Member
Registered: 2018-07-01
Posts: 5

USB-C Dock Gen 2 40AS + T14 AMD + 4k Monitor not working on Linux

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  

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#2 2021-07-17 16:35:28

kilobytech
Member
Registered: 2018-07-01
Posts: 5

Re: USB-C Dock Gen 2 40AS + T14 AMD + 4k Monitor not working on Linux

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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