It's the wonderful new synaptics support in the pms driver. It also causes a bunch of other odd behavior and is really fucking annoying if you aren't used to it.
F Bax [fbax...@gmail.com] wrote: > I upgraded from 5.0 to 5.1 yesterday; everything looks good except that tap > of touchpad is ignored. It used to act the same as left click. dmesg > follows... > > Are there any suggestions what files I should be looking at? > > pms0 at pckbc0 (aux slot) > pms0: Synaptics touchpad, firmware 6.2