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4k1

Member

Registered: 2018-06-06

Posts: 6

External monitor not working through Lenovo dock

I have "Lenovo T480s" laptop and "Lenovo Hybrid USB-C with USB-A" dock with it. I use USB-C (both ends) to connect my laptop and the dock. Everything else seems to work fine, but xrandr does not detect my external monitor. It's in the dock's display port.

Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 310mm x 170mm
   1920x1080     60.01*+  59.93    48.01
   1680x1050     59.88
   1400x1050     59.98
   1600x900      60.00    59.95    59.82
   1280x1024     60.02
   1400x900      59.96    59.88
   1280x960      60.00
   1368x768      60.00    59.88    59.85
   1280x800      59.81    59.91
   1280x720      59.86    60.00    59.74
   1024x768      60.00
   1024x576      60.00    59.90    59.82
   960x540       60.00    59.63    59.82
   800x600       60.32    56.25
   864x486       60.00    59.92    59.57
   640x480       59.94
   720x405       59.51    60.00    58.99
   640x360       59.84    59.32    60.00
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
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)

I think DP1 should show connected. How can I debug this more or how could I fix it? Monitor works fine if connected directly on the laptop, but not through the dock.

EDIT1: "dmesg -wH" gives nothing when plugging/unplugging the monitor on the dock.

EDIT2: HDMI doesn't work on dock either, but works when connecting directly to laptop. dmesg didn't say anything, even though it worked on laptop, so I guess edit1 can be disregarded.

Last edited by 4k1 (2018-06-12 09:59:17)