Differences between revisions 46 and 47
Revision 46 as of 2016-05-16 16:23:41
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Editor: ?João Matos
Comment: Add section regarding the change from synaptics to libinput in Stretch. Please review.
Revision 47 as of 2016-05-26 07:45:33
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Editor: ?MarkVandenBorre
Comment: to reenable a disabled touchpad in gnome on stretch
Deletions are marked like this. Additions are marked like this.
Line 165: Line 165:
To reenable a disabled touchpad in gnome on stretch:
{{{
gsettings set org.gnome.desktop.peripherals.touchpad send-events 'enabled'
}}}

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Introduction

This document is applicable to squeeze, wheezy, jessie and stretch.

Determining the type of Touchpad

The following command will tell you whether you have a Synaptics, ALPS or Elantech touchpad:

egrep -i 'synap|alps|etps' /proc/bus/input/devices

(Elantech support was enabled in Linux kernel 2.6.32-4.)

Desktop configuration

Some desktop environments such as GNOME and KDE can allow you to adjust settings of your touchpad through a graphical system settings panel.

If you can't find a Touchpad or Synaptics tab in your system settings, or the settings you wish to change cannot be changed through the GUI, follow the instructions below to configure system-wide via /etc/X11/xorg.conf.d/synaptics.conf. However, be aware that it is likely your desktop preferences, if you have them, will override your system-wide settings.

Debian 7 "Wheezy"

On GNOME, click the system menu (top-right corner), select System Settings, then select "Mouse and Touchpad" (under Hardware).

On KDE:

  1. Install the kde-config-touchpad package.

  2. Open System Settings from the Kickoff Application Launcher, go to Input Devices (under Hardware) and select the "Touchpad" tab.

Debian 6.0 "Squeeze"

On GNOME, go to System -> Preferences -> Mouse, there should be a "Touchpad" tab.

On KDE:

  1. Install the kde-config-touchpad package.

  2. Go to System Settings -> Input Devices, there should be a "Touchpad" tab.

System-wide configuration

Read the manual

This manual will tell you all the options that are available for the synaptics driver:

man 4 synaptics

Override options in /etc/X11/xorg.conf.d/synaptics.conf

At start, Xorg reads vendor-supplied configuration commands from directory /usr/share/X11/xorg.conf.d (details in man xorg.conf.d).

If you want to override the defaults system-wide, use a file in /etc/X11/xorg.conf.d, e.g. /etc/X11/xorg.conf.d/synaptics.conf, for configuration (but this will work just as well in a combined /etc/X11/xorg.conf file). /usr/share/X11/xorg.conf.d contains distro-supplied samples which can be copied over (or at least keep an eye on their settings when creating your own configuration). The following example shows how to enable tapping and how to configure various other options; you probably won't need everything in it. Comment out any old config for synaptics before replacing it with this new config.

(xserver-xorg-input-synaptics has tapping disabled by default for touchpads with one or more physical buttons; see /usr/share/doc/xserver-xorg-input-synaptics/NEWS.Debian.gz. For a list of available options, see synclient -l . Not all options are appropriate; for example, Elantech touchpads don't support pressure, and many other touchpads don't support multitouch.)

Section "InputClass"
        Identifier      "Touchpad"                      # required
        MatchIsTouchpad "yes"                           # required
        Driver          "synaptics"                     # required
        Option          "MinSpeed"              "0.5"
        Option          "MaxSpeed"              "1.0"
        Option          "AccelFactor"           "0.075"
        Option          "TapButton1"            "1"
        Option          "TapButton2"            "2"     # multitouch
        Option          "TapButton3"            "3"     # multitouch
        Option          "VertTwoFingerScroll"   "1"     # multitouch
        Option          "HorizTwoFingerScroll"  "1"     # multitouch
        Option          "VertEdgeScroll"        "1"
        Option          "CoastingSpeed"         "8"
        Option          "CornerCoasting"        "1"
        Option          "CircularScrolling"     "1"
        Option          "CircScrollTrigger"     "7"
        Option          "EdgeMotionUseAlways"   "1"
        Option          "LBCornerButton"        "8"     # browser "back" btn
        Option          "RBCornerButton"        "9"     # browser "forward" btn
EndSection

It is normal for a touchpad to be presented as both a Synaptics device and as an ImPS/2 device. If this is so, then /var/log/Xorg.0.log should show that X has found a touchpad on /dev/input/event6 (for example) and probably also that it has failed to do so on /dev/input/mouse0 (for example). This is fine.

Multitouch

If multitouch doesn't work for you, your hardware may not support it, but you can use the following options to emulate multitouch which allows most of the features to work. Try adding these lines to the Touchpad section (shown above):

        Option          "EmulateTwoFingerMinZ"  "35"
        Option          "EmulateTwoFingerMinW"  "8"

You can check which buttons are reported in Xorg.0.log to see if you have multitouch. A touchpad without this capability reports only the usual "left", "right" and "middle" buttons:

$ grep "TouchPad: buttons:" /var/log/Xorg.0.log
(II) SynPS/2 Synaptics TouchPad: buttons: left right middle

A touchpad with multitouch reports "double" for two-finger multitouch and "triple" for three-finger multitouch:

$ grep "TouchPad: buttons:" /var/log/Xorg.0.log
(II) SynPS/2 Synaptics TouchPad: buttons: left right middle double triple

The syndaemon Helper

syndaemon is able to help with a number of things, including palm-check and such. one possibility for loading this at X startup for all users is to add a separate file in /etc/X11/Xsession.d (i.e. /etc/X11/Xsession.d/98x11-syndaemon)

# This file is sourced by Xsession(5), not executed.

# Load settings from ~/.qsynaptics
/usr/bin/qsynaptics -r

# start synaptics daemon to enable proper communication with touchpad
/usr/bin/syndaemon -d -t -k -i 1

This also loads settings from the qsynaptics control panel. This can of course be omitted. If you leave it in, you should make sure all new users have sensible options set by copying a working .qsynaptics to /etc/skel.

Troubleshooting

Touchpad does not work after resuming from hibernate/suspend

Sometimes when resuming from hibernate/suspend mode, the touchpad may stop working, even if synclient reports it as activated.

The following solutions were reported to get the touchpad working again:

  • Switch to a console, then switch back to X again

or

  • Hibernate/suspend again, then resume again

or

  • Unload the touchpad kernel module, then load it again.
    • Warning: this should NOT be done from within an X session (or the X server will crash), but from a virtual console. E.g.:

    • Go to a virtual console, press Ctrl-Alt-F2

    • Log in as root and unload/load the relevant kernel module, e.g. modprobe -r psmouse ; modprobe psmouse

    • Go back to the X session, press Ctrl-Alt-F1

Change to libinput Xorg driver in Debian 9 "Stretch"

The synaptic Xorg driver in being superseded by the newer libinput driver, which can provide lower-level access to multi touch events to clients, but is currently lacking some features found in the older driver.

You can make the synaptics driver take precedence over libinput by copying /usr/share/X11/xorg.conf.d/50-synaptics.conf into /etc/X11/xorg.conf.d, so as to make it take precendence over the libinput configuration file found at /usr/share/X11/xorg.conf.d/90-libinput.conf.

The synclient and syndaemon commands don't work with the libinput driver and will instead exit with an error message such as:

$ synclient
Couldn't find synaptics properties. No synaptics driver loaded?
$ syndaemon
Unable to find a synaptics device.

The synaptics driver is provided by xserver-xorg-input-synaptics. The libinput driver is provided by xserver-xorg-input-libinput.

To reenable a disabled touchpad in gnome on stretch:

gsettings set org.gnome.desktop.peripherals.touchpad send-events 'enabled'


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