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smoneck

Member

Registered: 2014-05-14

Posts: 105

HDMI Ports Listed as DP on Thinkpad Dock

Hi,

I have a ThinkPad Thunderbolt 3 Dock Gen 2 and just noticed that the HDMI ports are listed as DP via xrandr but they work.

This seems like a bug to me. Any ideas?

Thank you!

Screen 0: minimum 8 x 8, current 2560 x 1440, maximum 32767 x 32767
eDP1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 310mm x 170mm
   2560x1440     60.01*+  59.95  
   1920x1440     60.00  
   1856x1392     60.01  
   1792x1344     60.01  
   2048x1152     60.00    59.90    59.91  
   1920x1200     59.88    59.95  
   1920x1080     59.96    60.00    59.93  
   1600x1200     60.00  
   1680x1050     59.95    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)
DP1-1 disconnected (normal left inverted right x axis y axis)
DP1-2 disconnected (normal left inverted right x axis y axis)
DP1-3 connected (normal left inverted right x axis y axis)
   3840x2160     60.00 +  60.00    50.00    59.94    30.00    30.00    25.00    24.00    29.97    23.98    29.98  
   1920x2160     59.99  
   1920x1080     60.00    60.00    50.00    59.94  
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1440x900      74.98    59.90  
   1280x960      60.00  
   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    72.81    66.67    60.00    59.94  
   720x400       70.08  
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)

P.s. I thought that xrandr just lists what is really possible on that setup. Nevertheless I can't run the 60 fps 4k on my HDMI cable. Is this an on-the-edge case regarding the quality of the cable or should this not be listed at all?

Last edited by smoneck (2020-06-18 08:20:05)

Lone_Wolf

Member

From: Netherlands, Europe

Registered: 2005-10-04

Posts: 11,919

Re: HDMI Ports Listed as DP on Thinkpad Dock

DisplayPort 1.2 – compatible with existing DisplayPort displays, devices, and cables
– Connect DVI, HDMI, and VGA displays via adapters

Thunderbolt only supports DisPlayPort , your dock probably has Thinderbolt3-to-hdmi adapters built in.

Some videocards can provide 4k @30 Hz over hdmi , but have trouble with 4k @60 Hz, which videocard / integrated GPU do you have ?

Also suppport for 4k @ 60 really needs HDMI 2 or better support on both sides (HDMI 1.3 - 1.4 has very limited support for it, earlier versions have none)

Which HDMI version does your screen support ?

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Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.

(A works at time B)  && (time C > time B ) ≠  (A works at time C)