Tablet PC - ArchWiki

# Tablet PC

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This article aggregates information to get Arch Linux working on a tablet PC. The instructions contain information for getting the stylus, stylus rotation, and screen rotation to work properly on such devices.

## Models

Intel (x86) tablets that are known to work (well) with Arch:

- Samsung Series 7 Slate XE700T1A
- Microsoft Surface Pro 3
- Samsung ATIV Smart PC Pro XE700T1C
- Microsoft Surface Book 2
- Asus T300 Chi
- Acer Switch 3
  - Older models are shipped with a 32 bits UEFI only, like the ASUS x205ta
  - Recent models are shipped with a nonworking touchpad

## Stylus

Install xf86-input-wacom.

Note: To configure styles devices manually (although not recommended), see the Linux Wacom Project Wiki.

## On-screen keyboards

See List of applications/Utilities#On-screen keyboards.

## Rotation

Unless you are running a very old Xserver, rotation capabilities (included in xrandr) should already be on by default. If not, you can enable xrandr by adding the following option to the Screen section of the xorg.conf file.

    Option         "RandRRotation" "on"

Save the file and restart the xserver for changes to take effect.

### Stylus and screen rotation

#### With xsetwacom

To set the screen and stylus input to portrait mode:

     xrandr -o 3
     xsetwacom set stylus Rotate cw

To return to landscape mode:

     xrandr -o 0
     xsetwacom set stylus Rotate none

In case the device 'stylus' cannot be found, use

    xsetwacom list devices

to get a list of devices. Mine for example was

    xsetwacom set "Wacom Co.,Ltd. Pen and multitouch sensor Pen stylus" Rotate cw

Source: http://xournal.sourceforge.net/manual.html If you still cannot change the rotation, you can try to use xinput.

#### With xinput

You can also use xinput to turn the stylus, like you would rotate a touchscreen.

To set the screen and stylus input to portrait mode:

     xrandr -o left
     xinput set-prop <Name of Stylus|Touch Screen> --type=float "Coordinate Transformation Matrix"  0 -1 1 1 0 0 0 0 1

To return to landscape mode:

     xrandr -o normal
     xinput set-prop <Name of Stylus|Touch Screen> --type=float "Coordinate Transformation Matrix"  0  0 0 0 0 0 0 0 0

If your stylus is only listed as keyboard while using "xinput list", these are my results:

    $ xinput list

    ⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
    ⎜   ↳ 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)]
        ↳ ELAN0732:00 04F3:272A Pen               	id=11	[slave  keyboard (3)] #My Pen

You can try touching the screen with the pen:

    $ xinput list

    ⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
    ⎜   ↳ SynPS/2 Synaptics TouchPad              	id=14	[slave  pointer  (2)]
    ⎜   ↳ ELAN0732:00 04F3:272A Pen Pen (0)       	id=17	[slave  pointer  (2)] #My Pen Pointer
    ⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
        ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
        ↳ ELAN0732:00 04F3:272A Pen               	id=11	[slave  keyboard (3)] #My Pen Keyboard

Using the now listed pointer, the commands should work as expected, turning the stylus.

This worked on my HP Envy x360.

### XFCE: Stylus and screen rotation

The following script will rotate the display 90 degrees clockwise every time it is executed. It will also rotate the wacom pointer so that the stylus will still work.

    rotate.sh

    #!/bin/bash

    case $(xfconf-query -c pointers -p /Wacom_ISDv4_90_Pen_stylus/Properties/Wacom_Rotation) in
        2)  # Currently top is rotated left, we should set it normal (0°)
              xrandr -o 0
              xfconf-query -c pointers -p /Wacom_ISDv4_90_Pen_stylus/Properties/Wacom_Rotation -s 0
              xfconf-query -c xsettings -p /Xft/RGBA -s rgb
              ;;
        0)  # Screen is not rotated, we should rotate it right (90°)
               xrandr -o 3
               xfconf-query -c pointers -p /Wacom_ISDv4_90_Pen_stylus/Properties/Wacom_Rotation -s 1
               xfconf-query -c xsettings -p /Xft/RGBA -s vbgr
               ;;
        1)    # Top of screen is rotated right, we should invert it (180°)
               xrandr -o 2
               xfconf-query -c pointers -p /Wacom_ISDv4_90_Pen_stylus/Properties/Wacom_Rotation -s 3
               xfconf-query -c xsettings -p /Xft/RGBA -s bgr
               ;;
        3)  # Screen is inverted, we should rotate it left (270°)
               xrandr -o 1
               xfconf-query -c pointers -p /Wacom_ISDv4_90_Pen_stylus/Properties/Wacom_Rotation -s 2
               xfconf-query -c xsettings -p /Xft/RGBA -s vrgb
               ;;
        *)
               echo "Unknown result from 'xfconf-query -c pointers -p /Wacom_ISDv4_90_Pen_stylus/Properties/Wacom_Rotation'" >&2
               exit 1
               ;;
    esac

Save the file and make it executable:

    chmod +x rotate.sh

You can create a link to it on your desktop or panel, or link it to a keyboard shortcut or special button on your tablet.

### Touchscreen rotation

Grox is a simple script for rotating a touchscreen absolutely or by relative increments. It only uses xrandr to query the current state, rather than XFCE-specific features.

## Automatic rotation

### With xrandr + xinput

The following python script was developed to automatic rotate the screen and the touchscreen. Furthermore, it disable the touchpad for inverted, right, and left orientation, and supports automatic detection of accelerometers, touchscreens, and touchpad devices.

It works for devices with an accelerometer communicating through the industrial I/O subsystem `/sys/bus/iio/devices/iio:deviceX`, where X is the number of the device. Usually, it is necessary to change the following parameters dpath, devicename, and touchpad.

See rotate.py and for scripts the Surface in the github Surface Tools[dead link 2020-04-03 ⓘ] repository.

Here's a C version of the script that aims to reduce some system overhead: 2in1screen.c You will need to replace your actual touch device name and recompile. Instruction to recompile is located at the 1st line. You can put this in .xinitrc like so before the exec line:

    .xinitrc

    #!/bin/sh
    # xrandr --dpi 180
    xrdb -merge ~/.Xresources
    ~/bin/2in1screen &   # <<< invoke the binary around here will be fine
    exec i3

Note that there are many other surface pro 3 rotate scripts on github, including:

- https://github.com/freundTech/surface-tools/tree/master/autorotate
- https://github.com/simonwjackson/surface-pro-3-scripts[dead link 2020-04-03 ⓘ]
- https://github.com/andrewrembrandt/surface-autorotate2

### With GNOME

See iio-sensor-proxy. iio-sensor-proxy is available, the git version iio-sensor-proxy-gitAUR is available in the AUR.

If you want the rotation, but have the problem that GNOME is adjusting your brightness automatically in a bad way, then you can use these commands to disable it.

For current user, which can also be done via power management GUI:

    dbus-launch gsettings set org.gnome.settings-daemon.plugins.power ambient-enabled false

For GDM, which cannot be done via GUI:

    sudo -u gdm dbus-launch gsettings set org.gnome.settings-daemon.plugins.power ambient-enabled false

### With a KDE module

Note: kded_rotation is in early development stages and is a bit hacky. Use caution.

Install iio-sensor-proxy-gitAUR and kded-rotation-gitAUR, then restart your Plasma session. Screen rotation should now just work.

For automatic touch screen rotation edit `/usr/bin/orientation-helper` script, changing the hardcoded input device name to match the one you have (choose from the output of `xinput list`).

### With Screen Rotator

Note: ScreenRotator is in early development stages.

Install iio-sensor-proxy-gitAUR and screenrotator-gitAUR. It will start automatically at each session, but you can also launch it from the Applications menu (system section).

Screen rotator has no configuration, it will automatically detect orientation changes and rotate both your screen and touchscreen orientation accordingly.

## Tablet mode

You can use detect-tablet-mode-gitAUR to configure laptop and tablet modes (e.g. enable/disable keyboard/touchpad/trackpoint, start/kill on-screen keyboard etc.)

If no sensor is detected, it can be manually triggered using tablet-modeAUR.

## Desktop Environments / Window Managers

### i3

Using a tiling window manager like i3 makes a lot of sense for a tablet, where screen space is limited. While that may seem unintuitive at first -- think about it: Android, iOS and Windows 10's tablet mode all use tiling window managers. Thus, i3 is an excellent window managers for tablets running Arch. The problem is that i3 is designed to be used with a keyboard, without a mouse, so there are no touch controls built in. For the most part, users will need to build their own, though touch gestures (see #Tips and tricks) or by adding touch button controls to a status bar or panel. Users of the polybar status bar can try i3touchmenu.

## Tips and tricks

### Easystroke

Easystroke is a gesture recognition application, recognizing gestures by a variety of input devices, to include pen stylus, mouse, and touch. Gestures can be used to launch programs, enter text, emulate buttons and keys, and scroll. Easystroke is available in the AUR: easystroke-gitAUR.

#### Launch CellWriter under pen

One useful application of Easystroke is to use it to launch CellWriter right below your mouse pointer.

This article or section needs language, wiki syntax or style improvements. See Help:Style for reference.

Reason: Script dump, in-code comments (Discuss in Talk:Tablet PC#)
Note: This script requires the xdotool package, which is not installed by default.

    #!/bin/bash
    # Original author: mr_deimos (ubuntuforums.org). February 14, 2010
    # Many bugs fixed and improvements made by Ben Wong.  October 20, 2010

    # This script toggles the cellwriter letter recognizer window.
    # If a cellwriter window is visible, it will be hidden.
    # If cellwriter is not already running, this will create a new process.
    # If coordinates are specified, the window pops up at those coordinates.
    # If coordinates are not specified, the window is toggled, but not moved.

    # Implementation Note: this script is trickier than it should be
    # because cellwriter does two stupid things. First, it has no
    # --get-state option, so we can't tell if it is hidden or not. Second,
    # both the notification area applet and the actual program window have
    # the same window name in X, which means we can't simply use xwininfo
    # to find out if it is showing or not.
    #
    # (Of course, we wouldn't have to be doing this crazy script at all,
    # if cellwriter had a --toggle-window option to toggle showing the
    # keyboard, but that's another rant...)
    #
    # To work around the problem, we'll assume that if the window we got
    # information about from xwininfo is smaller than 100 pixels wide, it
    # must be an icon in the notification area. This may be the wrong
    # assumption, but, oh well...

    if [[ "$1" == "-v" || "$1" == "--verbose" ]]; then
        verbose=echo
        shift
    else
        verbose=:
    fi

    if [[ "$1" && -z "$2"  ||  "$1" == "-h"  ||  "$1" == "--help" ]] ; then
        cat >&2 <<EOF
    $(basename $0): Toggle showing the cellwriter window, optionally moving it."

    Usage:  $(basename $0) [x y]"
    	Where x and y are the desired position of the cellwriter window."
    	If x and y are omitted, the window is not moved."
    EOF
        exit 1
    fi

    if [[ "$1" && "$2" ]]; then
        x=$[$1-20]			# Offset slightly so cursor will be in window
        y=$[$2-30]
        [ $x -lt 0 ] && x=0		# Minimum value is zero
        [ $y -lt 0 ] && y=0
    fi

    if ! xwininfo -root >/dev/null; then
        echo "$(basename $0): Error: Could not connect to your X server." >&2
        exit 1
    fi

    # Try to obtain CellWriter's window id.
    # We can't use "xwininfo -name" b/c that might find the notification icon.
    OLDIFS="$IFS"
    IFS=$'\n'
    for line in $(xwininfo -root -tree | grep CellWriter); do
        line=0x${line#*0x}		# Just to get rid of white space before 0x.
        $verbose -en "Checking: $line\t"
        if [[ $line =~ (0x[A-Fa-f0-9]+).*\)\ *([0-9]+)x([0-9]+) ]]; then
    	id=${BASH_REMATCH[1]}
    	width=${BASH_REMATCH[2]}
    	height=${BASH_REMATCH[3]}
    	if [[ $width -gt 100 ]]; then
    	    $verbose "looks good."
    	    CW_WIN_ID=$id
    	    break;
    	else
    	    $verbose "too small, ignoring."
    	fi
        else
    	echo "BUG: The xwininfo regular expression in $0 is broken." >&2
        fi
    done
    IFS="$OLDIFS"

    #Check if Cellwriter's window is visible
    if [ "$CW_WIN_ID" ] ; then
        CW_MAP_STATE=`xwininfo -id "$CW_WIN_ID"|grep "Map State"|cut -f 2 -d :`
    else
        $verbose "Can't find cellwriter window, checking for a running process..."
        if ! pgrep -x cellwriter >& /dev/null; then
    	$verbose "No cellwriter process running, starting a new one."
    	if [[ "$x" && "$y" ]]; then
    	    cellwriter --show-window --window-x=$x --window-y=$y &
    	else
    	    cellwriter --show-window &
    	fi
    	exit 0
        else
    	$verbose "Found a process, so the window has not been created yet."
    	$verbose "Pretending the window is UnMapped."
    	CW_MAP_STATE=IsUnMapped
        fi
    fi

    $verbose "Map state: $CW_MAP_STATE"

    case "$CW_MAP_STATE" in

        *IsViewable*)		# Window is currently visible.
    	$verbose "hiding window"
    	cellwriter --hide-window &
    	;;

        *IsUnMapped*)		# Window is currently hidden or non-existent.
    	if [[ "$x" && "$y" && "$CW_WIN_ID" ]]; then
    	    $verbose "moving window to $x $y"
    	    xdotool windowmove $CW_WIN_ID $x $y
    	fi
    	$verbose "showing window"
    	cellwriter --show-window &    # In bg in case cw is not already running
    	;;

        *) 				# This will never happen...
    	echo "BUG: cellwriter is neither viewable nor unmapped" >&2
    	echo "BUG: ...which means this script, $0, is buggy." >&2
    	exit 1
    	;;
    esac

    exit 0

Save the script as cellwriter.sh in either `/usr/local/bin/` or `$HOME/bin`, and give it executable rights:

    chmod +x cellwriter.sh

Then create a gesture in Easystroke tied to the following command:

    cellwriter.sh $EASYSTROKE_X1 $EASYSTROKE_Y1

When you launch it (using the gesture you created), it will open right under your pen.

#### Gestures for the Alphabet

You can also use Easystroke to make gestures for the entire alphabet, replacing much of the need for CellWriter. To avoid having to make seperate gestures for the uppser-case letters, you can use the following script to activate the shift key.

Note: This script requires the xautomation package, which is not installed by default.

    #!/bin/bash
    if [ -f /tmp/shift ]
    then
      xte "keydown Shift_L" "key $1" "keyup Shift_L"
      rm -f /tmp/shift
    else
      xte "key $1"
    fi

Save the script as keypress.sh in either `/usr/local/bin/` or `$HOME/bin`, and give it executable rights:

    chmod +x keypress.sh

Then create a gesture in Easystroke tied to the following command:

    touch /tmp/shift

This will activate the shift key. To activate the letter keys, tie your gestures to the following command:

    keypress.sh $LETTER

Replace `$LETTER` with the letter in the alphabet in question.

So, when you want to enter an upper-case letter, use your gesture for the shift key followed by the letter. If you want a lower-case letter, simply use your gesture for the letter.

### Xournal & Xournal++

#### Xournal

Xournal is an application for notetaking, sketching, and keeping a journal using a stylus. Xournal aims to provide superior graphical quality (subpixel resolution) and overall functionality. xournalAUR can be installed from the extra repository.

You can also extend the functionality of Xournal with patches, to enable things such as autosaving documents and inserting images. See SourceForge for links to all the available patches. To apply a patch, download the PKGBUILD for Xournal from the ABS, and reference the article Patching in ABS.

#### Xournal++

Xournal++ (xournalpp) is the successor to Xournal that is currently in development. If you want a newer version Xournal, then you could try this. It is currently stable with little to no bugs that causes crashes.

### GNOME Screensaver

To unlock your gnome-screensaver using Cellwriter to enter your password, first start dconf-editor:

    $ dconf-editor

Under `/org/gnome/desktop/screensaver`, `embedded-keyboard-command` to `cellwriter --xid --keyboard-only`, and check the `embedded-keyboard-enabled` checkbox.

Alternatively, instead of using the graphical registry editor, you can simply type these into your command line:

    $ gsettings set org.gnome.desktop.screensaver embedded-keyboard-command "cellwriter --xid --keyboard-only"
    $ gsettings set org.gnome.desktop.screensaver embedded-keyboard-enabled true

### GDM

You can also use CellWriter with GDM. First open `/etc/gdm/Init/Default` as root with a text editor. Then near the bottom of the file, add the lines in bold as shown:

    fi
    cellwriter --keyboard-only &
    exit 0

You can add `--window-x` and `--window-y` to adjust the position of CellWriter accordingly. For example:

    cellwriter --keyboard-only --window-x=512 --window-y=768 &

Note: You can only use CellWriter with a Plain style GDM.

To start a fully fledged CellWriter instance within the user session, you might want to terminate the instance started with the keyboard-only switch within the gdm context. Add something such as `killall cellwriter` to your newly created file `/etc/gdm/PostLogin/Default`.

Note: This works in a single-user setup, if you have a multi-user setup, you might want to develop and post your more elaborate solution.

### LightDM

Configuring LightDM to use Onboard for touchscreen login and unlocking is likely the simplest option (and stable) to provide onscreen keyboard login (when using the default GTK greeter).

Ensure onboard and lightdm-gtk-greeter-settings are installed and run `lightdm-gtk-greeter-settings` to configure onboard to start.

Specifiying `onboard -t Droid -l Phone` configures the Droid theme and sets the Phone layout.

### Touchegg

Touchegg is a multitouch gesture recognizer. It can recongize up to five finger gestures (tap, drag, pinch, rotate...).

## Troubleshooting

### Wacom Drivers

These commands are useful in troubleshooting:

    wacdump -f tpc /dev/ttyS0
    xidump -l
    xidump -u stylus

If xidump shows that your tablet's max resolution is the same as screen resolution, then your wacom driver has rescaled your wacom coordinates to the X server's resolution. To fix this, try recompiling your linuxwacom driver with:

    ./configure --disable-quirk-tablet-rescale

### Screen Rotation

Some video drivers do not support rotation. To check if your driver supports rotation, check the output of `xrandr` for the list orientations:

    normal left inverted right

Note: The following driver(s) are known not to support rotation: fglrx
Category:

- Mobile devices

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