Lenovo yoga 7, keyboard not working under ubuntu 22.04

Is this a dual boot system?

yes, it is
Windows 11 + Ubuntu 22.04

on the boot.log I got these error messages if this can help:
[FAILED] Failed to start Load Kernel Module efi_pstore.
See 'systemctl status modprobe@efi_pstore.service' for details.
         Starting Load Kernel Module mtdpstore...
[FAILED] Failed to start Load Kernel Module pstore_blk.
See 'systemctl status modprobe@pstore_blk.service' for details.
[FAILED] Failed to start Load Kernel Module pstore_zone.
See 'systemctl status modprobe@pstore_zone.service' for details.
[FAILED] Failed to start Load Kernel Module ramoops.

If you connect an external keyboard, does it work then?

Yes the external keyboard works

The pstore messages most probably are not related at all. there was a recent update that now leads to some strange messages (including "mtd device must be supplied (device name is empty)", see Bug #1981622) but they all should not have an effects on the keyboard.

This question was expired because it remained in the 'Open' state without activity for the last 15 days.

I can confirm this issue with a Lenovo Yoga 7 with AMD Ryzen CPU.

The internal keyboard is completely non-functional in the installer or live CD. In my case, even hotkeys for screen brightness control do not seem to work.

External USB keyboard works fine.

I can also confirm this problem. I have just received the new Yoga 7 AMD Ryzen 7 6800U and the keyboard is not detected here as well. It's on Pop OS 22.04 but I guess the problem is the same as on Ubuntu 22.04.
Only the brightness control is detected. External keyboard works. The mentioned grub changes have been tried as well without success.

Hello guys I solved this by recompiling the kernel with this patch
https://<email address hidden>/

@Girolamo: Sorry if my question is stupid, but how did you recompiled the kernel with the patch?

I don't remember all the steps precisely but:

I Downloaded the last Kernel from Kernel.org
and patched the kernel with the patch available here https://<email address hidden>/ (I am not 100% sure if I used git patch or git diff to patch it)

copied the config file you are currently using to the new kernel with
cp /boot/config-`uname -r` .config
and then type
make oldconfig ( Probabily it will asks what to do with the new parameters, but I left it as default)

then compile the kernel as deb pkg with
make -j4 deb-pkg where 4 is the number of cores you may want to use (wait a bit) (with a 6800u you can use more)

sudo dpkg -i linux-*.deb to install the packages and
sudo update-grub to update grub

If evething went smooth the you can load the new kernel with the keyboard working

Thanks for the instruction. I can see a new Linux kernel 6.0 has been released and it should include the Ryzen 6000 keyboard fix:

https://harchi90.com/linux-6-0-supporting-new-intel-amd-hardware-performance-improvements-much-more/

I think I will try this one first, and if it's not working then go for recompiling the kernel with the patch.