[Dell Inspiron 7746] Tap to click does not work on the clickpad with 14.04.2

[Po-Hsu Lin]

CID: 201408-15456 Dell Inspiron 7746

On the clickpad of this system, user can't:
* double tap to open a directory
* single tap to select a file
* tap with two-fingers to do the right click
* Can't do drag and drop or select multiple files with two fingers (bug 1439608)

And sometimes the cursor can't be moved (you can see from xev that it will send left click event automatically, hindering the cursor movement)

ubuntu@201408-15456:~$ xinput list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ Logitech USB-PS/2 Optical Mouse id=10 [slave pointer (2)]
⎜ ↳ ELAN Touchscreen id=12 [slave pointer (2)]
⎜ ↳ DLL0691:00 06CB:75BE UNKNOWN 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)]
    ↳ Power Button id=8 [slave keyboard (3)]
    ↳ Sleep Button id=9 [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)]

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.16.0-33-generic 3.16.0-33.44~14.04.1
ProcVersionSignature: Ubuntu 3.16.0-33.44~14.04.1-generic 3.16.7-ckt7
Uname: Linux 3.16.0-33-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.8
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Apr 2 23:47:18 2015
InstallationDate: Installed on 2015-04-03 (0 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
SourcePackage: linux-lts-utopic
UpgradeStatus: No upgrade log present (probably fresh install)

[Po-Hsu Lin (cypressyew)]

Also affect 201408-15457 Dell Inspiron 7746

[Keng-Yu Lin (lexical)]

@Po-Hsu, can you try the following:

  (1) cat /proc/bus/input/devices to find the sysfs path of the clickpad node.
  (2) ls that node and check the event number of it
  (3) install evtest package and run `evtest /dev/input/eventX` X is the number from (2)

please post the result back here.

[Po-Hsu Lin (cypressyew)]

Hi Keng-Yu,
Here is the `cat /proc/bus/input/devices` output:
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 10000 0 0 0 0
B: ABS=660800011000003

I: Bus=0018 Vendor=06cb Product=75be Version=0100
N: Name="DLL0691:00 06CB:75BE UNKNOWN"
P: Phys=
S: Sysfs=/devices/pci0000:00/INT3433:00/i2c-8/i2c-DLL0691:00/0018:06CB:75BE.0001/input/input11
U: Uniq=
H: Handlers=mouse1 event10
B: PROP=1
B: EV=b
B: KEY=6420 10000 0 0 0 0
B: ABS=260800000000003

There are two events here corresponding to these two devices, event5 and event10.
evtest with event5 does not detect anything with touching, clicking and moving on the clickpad.
Please find the attachment for the single tapping on it with xevtest event10

[Po-Hsu Lin (cypressyew)]

Also, it works with the latest mainline kernel, 4.1.0-040100rc1

[penalvch (penalvch)]

Po-Hsu Lin, please execute the following command only once, as it will automatically gather debugging information, in a terminal:
apport-collect 1439938

[Po-Hsu Lin (cypressyew)]

This issue has gone with 3.16.0-77 and 4.4.0-57.78 kernel on 14.04
I will mark this issue as fix-released.
Thanks!