Remember my #issue with same hard- and software but one device doesn't support the native resolution of an external TFT?

I could fix it today with the help of #Claude #AI using its #Opus 4.1 #LLM: https://karl-voit.at/2025/09/14/fix-wrong-34-TFT-resolution/

As so often, it was actually a layer-8-issue. I unintentionally got a Debian testing kernel on the host that worked with the TFT. After using the testing kernel on the other host, the TFT now works on both machines.

However, I now need to find out how to *not* get testing packages for my systems where I don't want it ... different issue.

@alienghic @gnomon thanks for your help! 🙇

#publicvoit

Remember my #issue with same hard- and software but one device doesn't support the native resolution of an external TFT?

I found some time to re-test certain things:

Issue sticks to the SSD when switched between the 2 #X13 devices -> it's a software bug.

Same BIOS settings, same GRUB settings, same BIOS firmware but different "Capabilities" reported by "lspci -v":
https://karl-voit.at/2025/09/14/fix-wrong-34-TFT-resolution/

Got any further idea I can check?

@alienghic @gnomon

#Debian13 #Lenovo #X13gen5 #publicvoit