I assume the device in question is the 'SYNAPTICS Synaptics Large Touch Screen'. The log file in comment #56 shows that xserver-xorg-input- libinput is aware of the device but not using it.
It also looks like you have a Xorg config file that is trying to configure that device so that config file might be the problem. Please try removing any Xorg config files you have created. ** Package changed: gnome-shell (Ubuntu) => xserver-xorg-input-libinput (Ubuntu) ** Also affects: libinput (Ubuntu) Importance: Undecided Status: New ** Changed in: libinput (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-input-libinput in Ubuntu. https://bugs.launchpad.net/bugs/1886912 Title: DELL M3800 Touchscreen not working after login with fractional scaling. Status in libinput package in Ubuntu: Incomplete Status in xserver-xorg-input-libinput package in Ubuntu: Incomplete Bug description: Hello, I have freshly installed Ubuntu 20.04 and have a bug on my M3800. The touchscreen is working good on login screen bug after I enter my credentials and the gnome session open I can't use it. I'm on a dual boot computer and all is working well on Windows 10. How can I help you to track this bug and solve it ? Best regards To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libinput/+bug/1886912/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp