Thx for the update.
interesting to see it was indeed a kernel/firmware issue.
I'll close this for now.
Please do raise further issues that are potentially a kernel issue via
ubuntu-bug linux
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Released
** Changed in:
The issue appears to be fixed (at least 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.
(I'm on Ubuntu 22.04 LTS now though, no longer 20.04 LTS.)
The system now sporadically "drops" the
With kernel version 5.6.0-1048-oem, the stack trace looks different, but
the problem is still present.
[ 4881.023648] [ cut here ]
[ 4881.023782] WARNING: CPU: 1 PID: 1113 at
drivers/gpu/drm/amd/amdgpu/../display/dc/dcn20/dcn20_hwseq.c:1555
Since I just had the system "drop monitors" while in the UEFI with no OS
booted, this might not be an OS issue at all.
It can't be a docking / USB-C issue either, since the system sometimes
can't even switch to internal display and it also crashes with an
external monitor attached directly via
I finally managed to boot kernel 5.9 after several dozen tries.
"dmesg" output is attached, in case it is of interest.
** Attachment added: "dmesg-2020-10-20.txt"
https://bugs.launchpad.net/ubuntubudgie/+bug/1899336/+attachment/5424789/+files/dmesg-2020-10-20.txt
--
You received this bug
I just had the issue appear LIVE, while the system was already running
for more than 20 minutes (with "amdgpu" drivers and multi-monitor
support).
Connection to external monitors "dropped" and fortunately the system
switched to internal display (which does not always happen, sometimes
everything
Okay, I now tried several times.
With kernel 5.9.0:
- Boot 1: Boots up completely, system functional.
- Boot 2: Boots to login screen, crashes after login.
- Boot 3: Crashes before LUKS unlock.
- Boot 4: Boots to login screen, crashes after login.
- Boot 5: Boots to login screen, crashes after
Could you try 5.9 kernel?
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.9/
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https://bugs.launchpad.net/bugs/1899336
Title:
Thinkpad T14s (AMD) external monitors on
Seems automatic collection of ACPI dumps did not work, so I ran the
script under "/usr/share/apport/dump_acpi_tables.py" manually (as root).
This is the output.
** Attachment added: "acpidump.txt"
https://bugs.launchpad.net/ubuntubudgie/+bug/1899336/+attachment/5420945/+files/acpidump.txt
** Changed in: linux (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1899336
Title:
Thinkpad T14s (AMD) external monitors on docking station no
apport information
** Tags added: apport-collected
** Description changed:
I run Ubuntu Budgie 20.04 on my Lenovo ThinkPad T14s with Ryzen 4750U
processor together with the "Lenovo ThinkPad USB-C Dock (Gen 2)"
(40AS0090EU).
The docking station is connected via USB-C to the system,
** Description changed:
I run Ubuntu Budgie 20.04 on my Lenovo ThinkPad T14s with Ryzen 4750U
processor together with the "Lenovo ThinkPad USB-C Dock (Gen 2)"
(40AS0090EU).
The docking station is connected via USB-C to the system, supplies it
with power via USB Power Delivery and
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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Title:
Thinkpad T14s (AMD) external monitors on
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