I think I know what might be happening here... The firmware on these Synaptics touchpads supports i2c mode as well as psmouse mode. Older kernels prior to 3.11 didn't have very good i2c support and the firmware on the touchpad would fall back to psmouse mode. psmouse mode worked nicely on machines pre-loaded with 12.04 and probably worked OK up until 13.04. Once the Saucy kernels were introduced, the 3.11 kernels had better i2c support and thus the touchpad would load up in i2c mode.
Synaptics was supposed to be working on some hid-multitouch i2c drivers and I thought they would have been upstreamed by now. Without them, the touchpad will operate in *very* basic i2c mode. This also explains the difference between what you see in xinput with the older kernels (PS/2) versus newer ones (DLL060A:00 06CB:2734). So, yes, blacklisting i2c_hid is one way to work around the problem. I'll find out what the deal is with Synaptics... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1265885 Title: regression with respect touchpad To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1265885/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
