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07-29-2020

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T14 AMD with Dell 34" not working in full res.

2020-08-01, 14:03 PM

I am running ubuntu 20.20 with kernel 5.8 and the latest radeon 20.30 driver. For the dock I am using a ThinkPad Thunderbolt 3 Workstation Dock. My goal was to use the 34" inch as a main monitor and the other 27" as the second monitor. I had the same setup on the macbook which I replaced with the thinkpad.

Problem now, when I connect the stuff, I cannot even get the 34" inch monitor run in full res. It just stays black and dmesg gives me:

 

 

[  123.936285] input: Lenovo ThinkPad Thunderbolt 3 Dock USB Audio as /devices/pci0000:00/0000:00:08.1/0000:07:00.4/usb6/6-1/6-1.1/6-1.1.1/6-1.1.1.2/6-1.1.1.2:1.3/0003:17EF:3083.0002/input/input18

[  123.995103] hid-generic 0003:17EF:3083.0002: input,hidraw0: USB HID v1.11 Device [Lenovo ThinkPad Thunderbolt 3 Dock USB Audio] on usb-0000:07:00.4-1.1.1.2/input3

[  124.024670] [drm] DP Alt mode state on HPD: 1

[  124.121229] [drm] DM_MST: starting TM on aconnector: 00000000c19ed290 [id: 79]

[  125.199738] [drm:mod_hdcp_add_display_to_topology [amdgpu]] *ERROR* Failed to add display topology, DTM TA is not initialized.

[  125.199777] [drm] [Link 0] WARNING MOD_HDCP_STATUS_FAILURE IN STATE HDCP_UNINITIALIZED STAY COUNT 0

[  141.399232] [drm:mod_hdcp_add_display_to_topology [amdgpu]] *ERROR* Failed to add display topology, DTM TA is not initialized.

 

 

xrandr gives me:

DisplayPort-5 connected 2560x1080+0+0 (normal left inverted right x axis y axis) 800mm x 335mm

  3440x1440     59.97 +  49.99  

  2560x1440     59.95  

  2560x1080     60.00*

  1720x1440     60.00  

  1920x1080     60.00    50.00    59.94  

  1600x1200     60.00  

  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  

 

 

 

 

I can get the monitor running in 2560x1080 mode, but thats the max right now. Any ideas on how to get this working?

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