Thanks for your clarification.
As also requested by the support I:
- Booted a live usb of Fedora 40,
- Connected the screen,
- Collected the following logs: demidecode · GitHub
I am on the latest bios version, I tried the screen on all possible slots, with and without a usb-c expansion card, with the laptop being plugged or not.
I used no thirdparty cable nor hub, I used only the stock usb-c cable, the one with which the screen is working on other laptops.
For the sake of reference, this looks like the same issue as: DisplayPort over USB-C not working (AMD 13)
May it be related to AMD Framework USB-C charger compatibility issues ?
As mentioned in the first linked thread, I just ordered a USB 4, thunderbolt compatible cable, which solved the issue for at least one user.