Compare the info from /proc/bus/input/device before and after upgrade, the 06cb:2985 device will be disappeared.
I: Bus=0018 Vendor=06cb Product=2985 Version=0100 N: Name="DLL0662:00 06CB:2985" P: Phys= S: Sysfs=/devices/pci0000:00/INT33C3:00/i2c-1/i2c-DLL0662:00/input/input7 U: Uniq= H: Handlers=mouse0 event7 B: PROP=5 B: EV=b B: KEY=e520 10000 0 0 0 0 B: ABS=673800001000003 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1436137 Title: Touchpad "DLL0662:00 06CB:2985" detected as a SynPS/2 Synaptics TouchPad an, making 3 / 4-finger gesture does not work after upgrade on 14.04.1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1436137/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
