I had the same issue (with both Ubuntu 20.04 and 20.10). It does seem to be resolved after installing a 5.9 Kernel with the above patch applied (from @coiby https://www.spinics.net/lists/linux-input/msg69458.html.
I have scripted the process I used (download, patch, compile and install the kernel) for anyone else that's eager to get a working Touchpad on a Ubuntu 20 installation on Lenovo Legion 5 (Obviously there may be unwanted side effects of doing this). This will probably require Secure Boot to be disabled in the BIOS. See GitHub Gist here: https://gist.github.com/jbuncle/7dacde983b3c33b3b816b10e2fd2308a Command for convenience: `bash <(curl https://gist.githubusercontent.com/jbuncle/7dacde983b3c33b3b816b10e2fd2308a/raw/build-patched-kernel.sh)` Note the need for updating GRUB_CMDLINE_LINUX_DEFAULT with i2c- hid.polling_mode=1 (First time I've built the Linux Kernel myself or even commented on here!) Thanks to @Coiby Xu (coiby) -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-input-libinput in 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 _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
