I informed Lenovo support of the discussed issue on Feb,04 2020. Since then I discovered an update [1] (CJCN25WW), but it still doesn't solve the issue.
It's changelog said: "Summary of changes ================== General Information: CJCN25WW: 1. Update EC to CJEC27WW 2. Lenovo diagnostic of NOVO menu (04.11.000) 3. Intel release 2019 '2nd Security 4. BIOS initialize time (S3 resume) 5. Update thermal function for dGPU DPM" Today, Mar,02 2020 one more BIOS update (CJCN26WW) [2] appeared on Lenovo's web site with a change log saying: "Summary of changes ================== General Information: CJCN26WW: 1. Update EC to CJEC28WW" Guess there is still no change to ACPI table, but didn't have a chance to try it myself yet. [1] https://download.lenovo.com/consumer/mobiles/cjcn25ww.txt [2] https://download.lenovo.com/consumer/mobiles/cjcn26ww.txt https://download.lenovo.com/consumer/mobiles/cjcn26ww.exe -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1853277 Title: Lenovo ThinkBook 14-IML Touchpad not showing up in /proc/bus/input/devices To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1853277/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
