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Hi guys
I am not sure if this is a bug or if it is a normal behavior:
I have a Lenovo Ideapad and a docking station plugged into the USB-C slot. The docking station has two HDMI slots (and some USB and Ethernet).
I boot the laptop with the docking station connected and I have the following output with xrandr:
Screen 0: minimum 320 x 200, current 5120 x 1440, maximum 16384 x 16384
eDP connected (normal left inverted right x axis y axis)
1920x1080 60.00 +
1680x1050 60.00
1280x1024 60.00
1440x900 60.00
1280x800 60.00
1280x720 60.00
1024x768 60.00
800x600 60.00
640x480 60.00
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 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 527mm x 296mm
2560x1440 59.95*+
1920x1200 59.95
2048x1080 60.00
1920x1080 60.00 50.00 59.94
1600x1200 60.00
1680x1050 59.88
1280x1024 75.02 60.02
1280x800 59.91
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
DisplayPort-2 connected 2560x1440+2560+0 (normal left inverted right x axis y axis) 527mm x 296mm
2560x1440 59.95*+
1920x1200 59.95
2048x1080 60.00
1920x1080 60.00 50.00 59.94
1600x1200 60.00
1680x1050 59.88
1280x1024 75.02 60.02
1280x800 59.91
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
DisplayPort-3 disconnected (normal left inverted right x axis y axis)
My laptop screen is turned off and I am using the two 2560x1440 screens that are "connected" to DisplayPort-1 and DisplayPort-2.
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Then I unplug the USB-C connector or the docking station, which automatically turns on the laptop screen. The docking station is no longer connected. (In case you go somewhere with the laptop).
Then I plug the USB-C docking station back in and the screens are connected again.
This time the xrandr output shows the following:
Screen 0: minimum 320 x 200, current 5120 x 1440, maximum 16384 x 16384
eDP connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
1920x1080 60.00*+
1680x1050 60.00
1280x1024 60.00
1440x900 60.00
1280x800 60.00
1280x720 60.00
1024x768 60.00
800x600 60.00
640x480 60.00
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 primary (normal left inverted right x axis y axis)
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
DisplayPort-3 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 527mm x 296mm
2560x1440 59.95*+
1920x1200 59.95
2048x1080 60.00
1920x1080 60.00 50.00 59.94
1600x1200 60.00
1680x1050 59.88
1280x1024 75.02 60.02
1280x800 59.91
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
DisplayPort-4 connected 2560x1440+2560+0 (normal left inverted right x axis y axis) 527mm x 296mm
2560x1440 59.95*+
1920x1200 59.95
2048x1080 60.00
1920x1080 60.00 50.00 59.94
1600x1200 60.00
1680x1050 59.88
1280x1024 75.02 60.02
1280x800 59.91
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
DisplayPort-5 disconnected (normal left inverted right x axis y axis)
As you can see, the two 2560x1440 displays are now connected to DisplayPort-3 and DisplayPort-4.
When I unplug the USB-C docking station again and plug it back in, I still get the same xrandr output.
The question now is why the connection on the DisplayPorts changes. Basically and as logical I feel that the previous configuration would be restored.
Unfortunately, I cannot understand why DisplayPort-3 and DisplayPort-4 are now connected although nothing has changed on the docking station itself.
The EDID of the screens has remained the same. Nothing has changed in this respect.
Thanks
Regards
Last edited by LinuxFan84 (2022-05-29 16:04:56)
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