Somehow the device is (incorrectly) bound to hid-rmi instead of hid- multitouch.
I don't find any outstanding commits from HID subsystems between the two kernel versions though. Since hardwares at my hand don't have this issue, the quickest way is to perform a kernel bisection by you. $ sudo apt build-dep linux $ git clone git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/bionic linux $ cd linux $ git bisect start $ git bisect good Ubuntu-4.15.0-70.79 $ git bisect bad Ubuntu-4.15.0-72.81 $ make localmodconfig $ make -j`nproc` deb-pkg Install the newly built kernel, then reboot with it. If it still have the same issue, $ git bisect bad Otherwise, $ git bisect good Repeat to "make -j`nproc` deb-pkg" until you find the offending commit. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1854798 Title: Synaptics s3203 touchpad not working after update to kernel 4.15.0-72-generic To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1854798/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
