Comment 411 for bug 1887190

Since this is the main thread on the Internet about this issue, I suppose it is appropriate to post here even though I am using Manjaro.

- This issue is non-present on a Thinkpad 3 14ADA05 with touchpad MSFT0001:00 06CB:CE2D on kernel 5.9.16-1 which uses i2c_hid. It is not elantech or designware (doesn't load the associated specific i2c drivers). Installing an entirely new keyboard panel with a new touchpad, essentially rebuilding the entire laptop does not address this issue. It is the same model touchpad for this specific laptop model even if you order a new one (unless I got bad luck of the draw).

- The issue becomes present on kernel 5.10.23-1 (and previous versions of 5.10) up to 5.12rc3. Have not tried compiling 5.12rc5, but no reason to believe it would work.

The touchpad will fail to be recognized and work on bootup between 1-30 reboots. I have tried many things such as different kernels and GRUB_CMDLINE_LINUX_DEFAULT options, yes even checking to set the kernel config option others are suggesting (Manjaro removed then reinstated the CONFIG_I2C_HID_ACPI=m option). I also tore apart kernels 5.9 and 5.10 to look at the pinctrl-amd.c driver and found that there was no difference between the two on these kernels, so it is something other than what https://launchpadlibrarian.net/500948605/0303-pinctrl-amd2.patch addresses since it works on the former kernel but not the latter. Also, the patch fails to apply on 5.12rc5.

I don't really know how to compare the entire torn-apart kernels 5.9 and 5.10 to try and find what change(s) could possibly cause this bug. Hopefully someone else knows how to?

Might be able to get somewhere if so...

Other mods might be replacing the touchpad with a model not designed for the laptop, but I don't know where to start with that either.