I am closing this bug as "Won't fix" since it is caused by a bug in the
hardware+firmware of the PC, whereby the device identifies itself
incorrectly.
The workaround
echo "options psmouse proto=exps" | sudo tee -a
/etc/modprobe.d/psmouse.conf
manually tells the driver to use the Microsoft Intellimouse Explorer
protocol (PSMOUSE_IMEX). Without this the device detection identifies it
as a standard Intellimouse (PSMOUSE_IMPS) during auto-detect.
Device detection works through a list of protocols, starting with the
most basic (safest) and working through to more sophisticated protocols.
The order of detecting these protocols is fixed in the driver since
probing for an incorrect protocol can cause the device to lock-up if it
receives commands it does not understand.
drivers/input/mouse/psmouse-base.c::psmouse_extensions() is responsible
for detecting the connected device by calling a series of device-
specific detect() functions. The order of detection is:
Lifebook ("lifebook")
Kensington ThinkingMouse ("thinkps")
Synaptics TouchPad ("synaptics")
Cypress TrackPad ("cypress")
ALPS TouchPad ("alps")
OLPC HGPK touchpad ("hgpk")
Elantech touchpad ("elantech")
Genius mouse ("genius")
Logitech PS2++ ("logitech")
Trackpoint ("trackpoint")
TouchKit PS/2 ("touchkit")
Finger Sensing Pad ("fsp")
Intellimouse Explorer PS/2 "(imex")
default: Intellimouse PS/2 ("imps")
** Changed in: linux (Ubuntu)
Status: Incomplete => Won't Fix
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https://bugs.launchpad.net/bugs/23251
Title:
Synaptics tap-and-drag not functioning by default
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