Dell Vostro needs 'nomux' quirk, otherwise the touchpad misbehaves.
Reported-by: NRobert Kiwanuka <robert.kiwanuka@gmail.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>
Signed-off-by: NDmitry Torokhov <dtor@mail.ru>