Comment # 7 on bug 1193213 from Takashi Iwai

Could you give also the dmesg output from the working case, too?

Judging from the hwinfo outputs, the working case seems to have the elantech
touchpad, and the broken case doesn't have it.  The dmesg output shows some
error from elantech driver, but it's not clear whether it's the fatal error
that leaded the the lack of the device itself.

My wild guess is that, due to the failure from the elantech driver
initialization, it falls back to the legacy mouse that has no multi-finger
support.