Touchpad not recognized after BIOS update

[Michael Mueller]

The touchpad of my Lenovo IdeaPad Flex 3 11ADA05 stopped working after an BIOS upgrade from FPCN21WW to FPCN24WW. (Here is the changelog of FPCN24WW: https://download.lenovo.com/consumer/mobiles/fpcn24ww.txt )
The touchpad is no longer detected. It doesn't appear in 'xinput list' or '/proc/bus/input/devices' in Ubuntu 21.10, 21.04 or 20.04. With the old Bios it appeared as "MSFT0001:00 04F3:3072".

This Bug was also reported regarding archlinux ( https://bbs.archlinux.org/viewtopic.php?id=269900 ) some weeks ago, but there are no replies yet.

It would be great if someone could help me with this problem.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1947417/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Michael Mueller (muellerm)]

Added Logfiles (as tar file because only one attachment is allowed)

uname -a > uname-a.log
/proc/version_signature > version.log
sudo dmesg > dmesg.log (for old and new BIOS)
sudo lspci -vvnn > lspci-vvnn.log (for old and new BIOS)
cat /proc/bus/input/devices > devices.log (for old and new BIOS)

[Fabian (naib1)]

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://<email address hidden>/
If I can be of any further assistance, feel free to ask.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Fabian (naib1)]

Reposting link to mailing (without at-sign): https://lore.kernel.org/linux-input/20211015144714.lvp7vz7lmeku2jpj%40kallisto.localdomain/T/#u
Also attaching my logs as a tar archive.

[Gustavo Niemeyer (niemeyer)]

Thanks for taking the time to report this, Michael, and to provide a workaround, Fabian. The bug still exists as of today, even with the newest BIOS, and I was able to get 22.10 onto an older laptop thanks to your help.