Score:2

DisplayPort error on Thinkpad for Ubuntu

pl flag

My Thinkpad L480 constantly throws an error when connecting external monitors to the docking station. I have to open and close the lid of the notebook repeatedly to get a signal.

It throws the following error. Not sure what it means:

kernel: [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb 000000005b62a483 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
kernel: [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb 000000005b62a483 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed

Any idea what I could do? It does not happen under Windows...

mondotofu avatar
cn flag
What is the docking station make and model? Also, do you use the DisplayLink Manager software for Linux?
mondotofu avatar
cn flag
DisplayLink(R) USB Graphics Software for Linux is free software and they make a version for Ubuntu. https://www.synaptics.com/products/displaylink-graphics/downloads/ubuntu
Alv123 avatar
pl flag
@mondotofu it is a Thinkpad Pro Docking Station
mondotofu avatar
cn flag
That's the kind of docking station that I have, too for my Thinkpad T480. I recommend that you install the Ubuntu software and see if that makes for a smoother experience.
mondotofu avatar
cn flag
have you had a chance to try the DisplayLink software?
Alv123 avatar
pl flag
Not yet, I managed to work around the problem by switching to Wayland. There the problem does not occur.
mondotofu avatar
cn flag
Yes, Wayland is the future of display server. Glad you resolved it.
mangohost

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.