2

On this Dell 15-7568, there is a touchpad with the left and right click areas merged into the pad.

Dell Inspiron 15-7568 Touchpad

Steps to Reproduce

With a clean install of 16.04:

  1. Place Thumb on left-click area
  2. Place middle finger on center of pad
  3. Click with thumb by pressing down

The pointer no longer moves on the screen until:

  1. Pace thumb on left-click area
  2. TOUCH (not press) the center of pad

Pointer movement is back to normal.

  • Has anyone else come across similar issues? I'm trying to track down if this is Dell-specific.

  • What other useful diagnostic info could I provide?

System Information

sudo dmidecode | grep "System Information" -A 3

System Information
    Manufacturer: Dell Inc.
    Product Name: Inspiron 15-7568
    Version: Not Specified

xinput --list

⎡ Virtual core pointer                      id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ ELAN Touchscreen                          id=11   [slave  pointer  (2)]
⎜   ↳ DLL06FF:00 06CB:75C4 Touchpad             id=12   [slave  pointer  (2)]
⎜   ↳ SynPS/2 Synaptics TouchPad                id=14   [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=10   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=13   [slave  keyboard (3)]
    ↳ Dell WMI hotkeys                          id=15   [slave  keyboard (3)]`

xinput --list-props 12

Device 'DLL06FF:00 06CB:75C4 Touchpad':
Device Enabled (137):   1
Coordinate Transformation Matrix (139): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
Device Accel Profile (268): 1
Device Accel Constant Deceleration (269):   2.500000
Device Accel Adaptive Deceleration (270):   1.000000
Device Accel Velocity Scaling (271):    12.500000
Synaptics Edges (292):  49, 1180, 50, 4416
Synaptics Finger (293): 25, 30, 0
Synaptics Tap Time (294):   180
Synaptics Tap Move (295):   67
Synaptics Tap Durations (296):  180, 100, 100
Synaptics ClickPad (297):   1
Synaptics Middle Button Timeout (298):  0
Synaptics Two-Finger Pressure (299):    282
Synaptics Two-Finger Width (300):   7
Synaptics Scrolling Distance (301): -30, -30
Synaptics Edge Scrolling (302): 0, 0, 0
Synaptics Two-Finger Scrolling (303):   1, 1
Synaptics Move Speed (304): 1.000000, 1.750000, 0.129870, 0.000000
Synaptics Off (305):    0
Synaptics Locked Drags (306):   0
Synaptics Locked Drags Timeout (307):   5000
Synaptics Tap Action (308): 2, 3, 0, 0, 1, 3, 0
Synaptics Click Action (309):   1, 3, 0
Synaptics Circular Scrolling (310): 0
Synaptics Circular Scrolling Distance (311):    0.100000
Synaptics Circular Scrolling Trigger (312): 0
Synaptics Circular Pad (313):   0
Synaptics Palm Detection (314): 0
Synaptics Palm Dimensions (315):    10, 200
Synaptics Coasting Speed (316): 20.000000, 50.000000
Synaptics Pressure Motion (317):    30, 160
Synaptics Pressure Motion Factor (318): 1.000000, 1.000000
Synaptics Resolution Detect (319):  1
Synaptics Grab Event Device (320):  0
Synaptics Gestures (321):   1
Synaptics Capabilities (322):   1, 0, 0, 1, 1, 0, 0
Synaptics Pad Resolution (323): 12, 12
Synaptics Area (324):   0, 0, 0, 4000
Synaptics Soft Button Areas (325):  614, 0, 761, 0, 0, 0, 0, 0
Synaptics Noise Cancellation (326): 7, 7
Device Product ID (255):    1739, 30148
Device Node (256):  "/dev/input/event14"
3

The integrated keyboard and touchpad randomly freeze in my Dell Latitude 3450 (formally, my touchpad is a clickpad )

I solved all my problems with Synaptic touchpad and keyboard freeze by simple use libinput instead of synaptic driver. To do this, install:

sudo apt-get install xserver-xorg-input-libinput

additionally, to make sure it was libinput being used instead of synaptic driver, I removed the package with the Synaptic drivers

sudo apt-get remove xserver-xorg-input-synaptics

I also made some customizations in libinput settings. I created this configuration file:

/usr/share/X11/xorg.conf.d/99-libinput.conf

with this content:

Section "InputClass"
    Identifier "libinput touchpad catchall"
    Driver "libinput"
    MatchIsTouchpad "on"
    MatchDevicePath "/dev/input/event*"
    Option "Tapping" "True"
    Option "DisableWhileTyping" "True"
    Option "NaturalScrolling" "False"
    Option "AccelProfile" "adaptive"
    Option "AccelSpeed" "0.05"
    Option "MiddleEmulation" "True"
    Option "ScrollMethod" "twofinger"
    # Option "ClickMethod" "clickfinger"
    Option "ClickMethod" "buttonareas"
EndSection

See all available configuration options on manpage of libinput

http://manpages.ubuntu.com/manpages/xenial/man4/libinput.4.html

http://who-t.blogspot.com.br/2016/04/why-libinput-doesnt-have-lot-of-config.html

https://wayland.freedesktop.org/libinput/doc/latest/clickpad_softbuttons.html

https://wiki.archlinux.org/index.php/Libinput

I tested only on Ubuntu 16.04

UPDATE 2016-05-08: I had forgotten that I was using the linux Kernel v4.5.x (the default Ubuntu 16.04 linux kernel is v4.4.x) when I wrote this.

The problem of the integrated keyboard and touchpad randomly freeze, even with the above configurations, still persist on my Latitude 3450 if i use with the official Ubuntu 16.04 linux kernel v4.4.x series (i test with kernel4.4.0-21-generic and 4.4.0-22-generic).

The problem does not occur with kernel v4.5.x (4.5.0-040500-generic)

It was really simple to install linux kernel 4.5.x.

Find out how to do: http://ubuntuhandbook.org/index.php/2016/03/upgrade-linux-kernel-4-5-ubuntu/

Said that, install a not officially supported new kernel, can eventually result in many problems.

remember to NOT uninstall the official kernel, because if you have problems with the unofficial kernel (so far, everything works perfectly on my machine), you can still start the system with the official kernel.

ps:

if all this not work for you, maybe go back to use synaptic and try follow this tutorial: http://hgdev.co/install-ubuntu-15-10-on-the-dell-xps-13-9343-2015-a-complete-guide/

| improve this answer | |
  • I had never heard the term "clickpad" used before. That is exactly what the Dell Inspiron 15-7568 has. – TomSchober May 6 '16 at 15:34
  • if this not work for you, maybe go back to use synaptic and try follow this tutorial: hgdev.co/… – Fabio C. Barrionuevo da Luz May 6 '16 at 16:36
  • Yea sorry, installing libinput and removing synaptics like you suggested completely disabled the mouse. I'll try some of the other docs you've mentioned soon. Thanks. – TomSchober May 9 '16 at 14:55
  • 2
    you can find what the input driver Xorg load, by checking the log file less /var/log/Xorg.0.log another thing helped the tests was to remove and re-insert the module "psmouse" into the kernel sudo modprobe -r psmouse && sudo update-initramfs -u && sudo modprobe psmouse && sudo update-initramfs -u . I understand your frustration, since I suffered 6 months being forced to carry a mini keyboard and mouse usb in my backpack to enable me use my notebook – Fabio C. Barrionuevo da Luz May 9 '16 at 19:23
  • I've had trouble with the trackpad on my XPS 13 (9350) for awhile now and the changes suggested in Fabio's original post seem very promising so far. Thanks! – notmystyle Jul 9 '16 at 2:08

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