Synaptic Touchpad 2-finger pinch / expand and 3 / 4-finger gestures are not supported on 14.04

[Po-Hsu Lin]

This is a summary bug, in order to avoid duplicated reports.

For Synaptics touchpad, even if the touchpad is a multitouch-supported model,
the following gestures are still not supported on 14.04
* 2-finger pinch / expand
* 3-finger tap to move a window
* 4-finger tap to open dash

e.g.
$ xinput list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ ELAN Touchscreen id=10 [slave pointer (2)]
⎜ ↳ SynPS/2 Synaptics TouchPad id=12 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
    ↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
    ↳ Power Button id=6 [slave keyboard (3)]
    ↳ Video Bus id=7 [slave keyboard (3)]
    ↳ Power Button id=8 [slave keyboard (3)]
    ↳ Integrated_Webcam_HD id=9 [slave keyboard (3)]
    ↳ AT Translated Set 2 keyboard id=11 [slave keyboard (3)]
    ↳ Dell WMI hotkeys id=13 [slave keyboard (3)]
$ xinput list-props "SynPS/2 Synaptics TouchPad" | grep Capabilities
         Synaptics Capabilities (320): 1, 0, 0, 1, 1, 1, 1

For the 4th and the 5th "1", indicates that this touchpad supports two-finger and three-finger detection respectively.

This issue could be traced back to bug 1294515,
"mtdev was dropped:
  There are no touchpad drivers in the kernel tree that use protocol A, so
  using mtdev is just a computationally expensiv and memory-wasting noop."

Note that 2-finger tapping should work as a right click, and 2-finger vertical / horizontal scrolling should work as expected too.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Taihsiang Ho (tai271828)]

Dell Inspiron 3147 - Redwood (CID 201403-14889)
with 14.04.2 fresh installation

------------------------------------------------

failed: 2-finger pinch / expand
pass: 3-finger double tap to switch window
pass: 4-finger dash

-----------------------------------------------

Synaptics Capabilities (321): 1, 0, 0, 1, 1, 1, 1

[Po-Hsu Lin (cypressyew)]

@Taihsiang Ho
I bet there is another input device here, like DLL063E:00 06CB:2934 id=11
Which is making your multi-touch gesture working on the synapatic touchpad.
Please clarify this by adding xinput list output.
Thanks

[Po-Hsu Lin (cypressyew)]

BTW, I haven't seen any touchpad /clickpad that is working with two finger pinch / expand gesture (on the other hand, maybe I didn't find a application that support this)

[Taihsiang Ho (tai271828)]

cool! there is

DLL064D:00 06CB:2985 id=13

in xinput-list of 201403-14889

--------------------------------------------------------------

201403-14889-xinput-list.log

⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ ELAN Touchscreen id=12 [slave pointer (2)]
⎜ ↳ DLL064D:00 06CB:2985 id=13 [slave pointer (2)]
⎜ ↳ SynPS/2 Synaptics TouchPad id=15 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
    ↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
    ↳ Power Button id=6 [slave keyboard (3)]
    ↳ Video Bus id=7 [slave keyboard (3)]
    ↳ Video Bus id=8 [slave keyboard (3)]
    ↳ Power Button id=9 [slave keyboard (3)]
    ↳ Sleep Button id=10 [slave keyboard (3)]
    ↳ Integrated_Webcam_HD id=11 [slave keyboard (3)]
    ↳ AT Translated Set 2 keyboard id=14 [slave keyboard (3)]
    ↳ Dell WMI hotkeys id=16 [slave keyboard (3)]

[Po-Hsu Lin (cypressyew)]

Also affecting 201409-15477

I: Bus=0011 Vendor=0002 Product=0007 Version=01b1
N: Name="SynPS/2 Synaptics TouchPad"
P: Phys=isa0060/serio1/input0
S: Sysfs=/devices/platform/i8042/serio1/input/input6
U: Uniq=
H: Handlers=mouse0 event5
B: PROP=5
B: EV=b
B: KEY=e520 610000 0 0 0 0
B: ABS=660800011000003