Mouse & touchpad only working with "fallback initramfs"

[tebeka]

I have a new Lenovo E14 and the touchpad and mouse only work when I boot with “fallback initramfs”. From what I understand I need to find out the driver that’s missing from the regular boot using lsinitcpio and then use mkinitcpio to add it. However I’m not sure how exactly to do it.

Setup: Lenovo E14, i17 12th gen, XFCE, 5.19.1-3-MANJARO

Thanks!

[mbb]

Hi! Boot normally and issue lsmod > ~/normal.lsmod and then boot into fallback and issue lsmod > ~/fallback.lsmod. Then find what’s missing.

@tebeka

XFCE, 5.19.1-3-MANJARO

Have you tried a LTS kernel?

EDIT: found this here:

Example how to check for and extract embedded firmware¶

To check for, for example Silead touchscreen controller embedded firmware, do the following:

1. Boot the system with efi=debug on the kernel commandline
2. cp /sys/kernel/debug/efi/boot_services_code? to your home dir
3. Open the boot_services_code? files in a hex-editor, search for the magic prefix for Silead firmware: F0 00 00 00 02 00 00 00, this gives you the beginning address of the firmware inside the boot_services_code? file.
4. The firmware has a specific pattern, it starts with a 8 byte page-address, typically F0 00 00 00 02 00 00 00 for the first page followed by 32-bit word-address + 32-bit value pairs. With the word-address incrementing 4 bytes (1 word) for each pair until a page is complete. A complete page is followed by a new page-address, followed by more word + value pairs. This leads to a very distinct pattern. Scroll down until this pattern stops, this gives you the end of the firmware inside the boot_services_code? file.
5. “dd if=boot_services_code? of=firmware bs=1 skip= count=” will extract the firmware for you. Inspect the firmware file in a hexeditor to make sure you got the dd parameters correct.
6. Copy it to /lib/firmware under the expected name to test it.
7. If the extracted firmware works, you can use the found info to fill an efi_embedded_fw_desc struct to describe it, run “sha256sum firmware” to get the sha256sum to put in the sha256 field.

[tebeka]

Thanks! Will check later this week (need to work on this machine as well

[tebeka]

FWIW the 5.15 LTS works without an issue.

[tebeka]

@mbb I ran lsmod on 5.19, 5.19 fallback and 5.15 (last two has a working mouse).

The extra modules I see in the fallback are: elan_i2c, joydev, mousedev and veth. I guess it’s mousedev? How can I check?

[mbb]

I think you can try to put them in /etc/mkinitcpio.conf, at the MODULES=() section. Example:

MODULES=(lz4 lz4_compress)

Then recompile the kernel image with sudo mkinitcpio -p linux519 and reboot to the intended kernel. Don’t compile all the kernel images, because in case it doesn’t boot, you can select another entry in grub. You can start by including all those modules and test. If it works, you can then remove one by one to keep only needed ones.