No external USB-C monitor detection on my Thinkpad T14s AMD Gen3 powered by Fedora 38, maybe after firmware updates

[stephaneklein (Stéphane Klein)]

Hello,

USB-C external monitor detection no longer works on my Fedora 38.

At the end of July, detection was working well.

Here’s all the information:

• Laptop : Thinkpad T14s AMD Gen3
• Monitors tested:
  • Dell 24 Ultra HD 4K : P2415Q
  • 23.8" Dell P2421DC
• Connection : USB-C to DisplayPort
• Kernel : Linux t14s 6.4.11-200.fc38.x86_64 #1 SMP PREEMPT_DYNAMIC Wed Aug 16 17:42:12 UTC 2023 x86_64 GNU/Linux
• lshw output: lshw.txt · GitHub
• fwupdmgr get-history output: fwupdmgr get-history.txt · GitHub
• Desktop Gnome : 44
• Display manager : Wayland, version 1.22

I have a feeling that the problem occurred after the firmware Lenovo (ThinkPad) ThinkPad X13/T14s Gen 3 AMD was installed, I have upgraded from version 0.1.25 to 0.1.31

These two external monitors are detected when I connect the Thinkpad via USB-C to HDMI.

Question: have you had this problem in the last 3 weeks following a firmware or kernel update?

Best regards,
Stéphane

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Same question on Reddit Thinkpad and Lenovo Forum

[stephaneklein (Stéphane Klein)]

Problem corrected this morning.

This may be due to the upgrade of Kernel 6.4.11 to 6.4.12 (changelog).