At https://bugs.launchpad.net/udev/+bug/637208 someone has posted a solution that works for a4tech mouse users wich left click don't work anymore since dist upgrade.
You can solve the problem by typing this: What you see is my output, so change the 9 before "Device Enabled" to the ID of the Seccond detected A4TECH USB Device of your output for xinput --list > $ xinput --list ⎡ Virtual core pointer id=2 [master pointer (3)] ⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)] ⎜ ↳ A4TECH USB Device id=8 [slave pointer (2)] ⎜ ↳ A4TECH USB Device id=9 [slave pointer (2)] ⎣ Virtual core keyboard id=3 [master keyboard (2)] ↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)] ↳ Power Button id=6 [slave keyboard (3)] ↳ Power Button id=7 [slave keyboard (3)] ↳ AT Translated Set 2 keyboard id=10 [slave keyboard (3)] > $ xinput set-int-prop 9 "Device Enabled" 8 0 You have to do this every time you reboot your computer, I hope this bug get fixed asap -- Keyboard special keys interfere with mouse https://bugs.launchpad.net/bugs/636311 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs