I have now been able to test my setup on Ubuntu 22.04 with Linux
5.15.0-46-generic #49-Ubuntu on x86_64. I am happy to report that I can
now connect my external monitor through either HDMI or DisplayPort to
the USB-C docking station and it works as expected. I do still see the
occasional message of
The issue persists on Ubuntu 21.10 with Linux 5.13.0-39-generic.
Plugging in Display Port into the docking station wakes up the external
screen but does not produce an image (the screen stays black) the
builtin screen also goes and remains black until Display Port is
disconnected again. Dmesg repo
@kaihengfeng thank you for the update.
I have installed 5.14.0-051400rc5drmtip20210814-generic and am happy to report
that the external display connected through the docking station via HDMI or
DisplayPort works as expected.
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The issue persists on Ubuntu 21.04 with Linux kernel 5.11.0-25-generic.
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https://bugs.launchpad.net/bugs/1908139
Title:
ThinkPad T14s external display not working on ThinkP
@xpusostomos Thanks for adding to this bug report. Interesting, a
similar message
```
[ 537.010093] [drm:drm_dp_send_dpcd_read [drm_kms_helper]] *ERROR* mstb
271ba325 port 1: DPCD read on addr 0x60 for 1 bytes NAKed
```
also appears in my log, however, only right after plugging in the s
@Andre Plötze
As described in the bug report I have observed the following that make
me think that a hardware issue can be excluded:
> All above modes of connection work as expected with the same laptop, dock,
> and display on Windows 10 (installed as dual boot along side Ubuntu).
> All above mo
The issue persists as of Feb. 20 2021 on Ubunutu 20.10 with the latest updates
installed.
@kaihengfeng I tested with mainline 5.10 as requested, see above. Please let me
know if you require further information or testing.
** Changed in: linux (Ubuntu)
Status: Expired => New
--
You recei
I've installed mainline 5.10 and retried but the outcome was the same.
I've attached the corresponding dmesg log including the same kmsg
messages as before.
** Attachment added: "dmesg log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1908139/+attachment/5445155/+files/kernel5.10.dmesg
Public bug reported:
laptop: ThinkPad T14s Gen 1 - AMD Ryzen 7 PRO 4750U
docking station: ThinkPad USB-C Dock 2. Gen.
external display: NE MultiSync EA275UHD
OS: Ubuntu 20.10 - kernel 5.8.0
Plugging the external display into one of the docking station's two
DisplayPort connectors leads to the scr
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