On Mon, Apr 05, 2021 at 03:22:24PM -0000, James Hennig wrote: >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).
If kernel 5.9.16-1 with i2c_hid driver worked for you, I'd suggest you stick with the i2c_hid that comes with kernel 5.9.16-1 and build a stand-alone driver for newer kernel and replace newer i2c_hid driver. > >- 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. > -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1887190 Title: MSFT Touchpad not working on Lenovo Legion-5 15ARH05 To manage notifications about this bug go to: https://bugs.launchpad.net/pop-os/+bug/1887190/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
