I am the creator of the mentioned post at archlinux bbs. Apparently I needed to stop troubleshooting this issue (no time). I was at the stage of tracing functions in the newest kernel, but I failed. I wrote to the linux-i2c mailing list and Dmitry gave me a few hints before that.
He suspects that the BIOS update made changes to the ACPI description that Linux didn't expect. I solved this issue for me with downgrading to the earlier BIOS version: - Install Windows on an usb stick - F2 at boot > Configuration > Enable Boot downgrade (or similiar) - Boot into Windows (set it up etc.) - Download earlier BIOS: https://download.lenovo.com/consumer/mobiles/FPCN21WW.exe - Execute & let it Flash (TMP is reset; a warning is shown; I just ack'd it) To help in some way, I can post my current bag of information: https://op.xn--bimann-cta.de/bug/2021-10-15_dmesg.txt https://op.xn--bimann-cta.de/bug/2021-10-16_trace.txt https://op.xn--bimann-cta.de/bug/2021-10-17_dmesg.txt https://op.xn--bimann-cta.de/bug/2021-10-17_trace.txt https://op.xn--bimann-cta.de/bug/acpidump.lenovo-Ideapad-Flex-3-11ADA05.txt https://op.xn--bimann-cta.de/bug/hwinfo.txt https://op.xn--bimann-cta.de/bug/running_config.txt Working: https://op.xn--bimann-cta.de/bug/working_acpidump.lenovo-Ideapad-Flex-3-11ADA05.txt https://op.xn--bimann-cta.de/bug/working_dmesg.txt https://op.xn--bimann-cta.de/bug/working_hwinfo.txt Also see my mailing list entry: https://lore.kernel.org/linux-input/20211015144714.lvp7vz7lmeku2jpj@kallisto.localdomain/ If I can be of any further assistance, feel free to ask. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1947417 Title: Touchpad not recognized after BIOS update To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1947417/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
