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
Please test latest drm-tip kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/drm-tip/current/
Headers are not needed.
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Title:
Thanks for that. Happy to report that
5.14.0-051400rc5drmtip20210809-generic works for me.
Also happy to provide specific logging of DRM of the working
5.8.0-7642-generic or 5.14.0-051400rc5drmtip20210809-generic and the not
working 5.11.0-25-generic.
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@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 21.10 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
The issue with monitors "dropping" appears to be fixed for me with the
latest firmware.
- UEFI Version 1.14 (R1CUJ72W), issued on 2022-07-29.
- USB-Docking (Gen 2) Firmware Version 1.1.18, issued on 2022-09-14.
However, I now have the issue of my Ethernet connection "dropping"
shortly after boot.
Hi!
Are you sure this is not a hardware issue?
The reason I believe it is a hardware issue is because I observed my
system "drop monitors" on the docking station also under Windows 10 and
even while in the UEFI. Lenovo replaced both the motherboard and the
docking station (and I updated firmware
@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
[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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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
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Please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.10/amd64/
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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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
The issue seems to have been resolved for me with 5.13.0-7620, while it
was still broken with 5.13.0-7614. I realize these are System76 specific
kernels, but maybe the trend is the same for the corresponding 5.13.0-20
and 5.13.0-14.
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I'm running a Lenovo P14s AMD (basically same machine as T14 and similar
to T14s), with gen 2 dock (latest firmware), running Ubuntu 21.04 latest
updates, and I see this happen about every day, the external keyboard
and mouse stop working, and sometimes the monitor stops working...
sometimes just s
@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
The issue persists on Ubuntu 21.04 with Linux kernel 5.11.0-25-generic.
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Title:
ThinkPad T14s external display not working on ThinkP
I seem to have very similar issues. Using a Lenovo ThinkPad X1 Carbon
7th gen and ThinkPad USB-C Dock Gen 2. But I also see this on a
different docking station. I'm pretty sure they are both using USB-C DP-
alt mode.
When I boot my laptop connected to the docking stations, I can see BIOS
POST mess
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