GPD Pocket - ArchWiki

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Notes for the GPD Pocket.

## Specs

- Display: 7inch IPS 1920x1200
- CPU: Intel Atom X7-Z8750
- RAM: 8GB LPDDR3-1600
- Storage: 128GB eMMC SSD (non-replaceable)
- Battery: 7000mAh
- WiFi: Broadcom 4356 802.11ac
- Bluetooth: Broadcom 2045
- Audio: Realtek ALC5645
- Ports: 1 x USB 3 type A, 1 x MicroHDMI, 1 x USB 3 type C, 1 x 3.5mm Headphone Jack

## Configuration

### Manual

#### Backlight and KMS

Change `/etc/mkinitcpio.conf` to match the following:

    /etc/mkinitcpio.conf

    ...
    MODULES=(i915 pwm-lpss-platform)
    ...

This will enable backlight control, and fix a blackscreen on resume from suspend.

#### Screen rotation

Thanks to a kernel patch, the linux kernel should automatically hint screen rotation for the GPD pocket. If it does not, or if you do not use a desktop manager, follow instructions below.

#### Wayland

##### Basic Configuration

Create `/etc/udev/rules.d/99-goodix-touch.rules` to rotate the touchscreen, and fill it with:

    ACTION=="add|change", KERNEL=="event[0-9]*", ATTRS{name}=="Goodix Capacitive TouchScreen", ENV{LIBINPUT_CALIBRATION_MATRIX}="0 1 0 -1 0 1"

##### Right Click Emulation

Unlike Xorg, under which right click emulation can be enabled by the standard Xorg configuration files, under Wayland, such configuration is supposed to be exposed by the compositor, and unfortunately, some compositors (e.g. GNOME Wayland) do not expose these configurations properly. However, the regarding functionality is still available in `libinput`. Since these compositors normally load `/etc/profile.d`, `LD_PRELOAD` can be used to hook into `libinput` and force apply these configurations.

A sample implementation of this approach is available here.

#### Xorg

##### Basic Configuration

Create `/etc/X11/xorg.conf.d/30-monitor.conf` to rotate the monitor:

Note: The Identifier may be different depending on your display driver of choice (either `DSI-1` for modesetting or `DSI1` for xf86-video-intel)

    /etc/X11/xorg.conf.d/30-monitor.conf

    Section "Monitor"
      Identifier "DSI-1"
      Option     "Rotate" "right"
    EndSection

##### Gnome and GDM

Edit `~/.config/monitors.xml` (this file might not be present by default):

    ~/.config/monitors.xml

    <monitors version="2">
      <configuration>
        <logicalmonitor>
          <x>0</x>
          <y>0</y>
          <scale>2</scale>
          <primary>yes</primary>
          <transform>
            <rotation>right</rotation>
            <flipped>no</flipped>
          </transform>
          <monitor>
            <monitorspec>
              <connector>DSI-1</connector>
              <vendor>unknown</vendor>
              <product>unknown</product>
              <serial>unknown</serial>
            </monitorspec>
            <mode>
              <width>1200</width>
              <height>1920</height>
              <rate>60.384620666503906</rate>
            </mode>
          </monitor>
        </logicalmonitor>
      </configuration>
    </monitors>

This sets the correct rotation (`<rotation>right</rotation>`) and a scale factor of 2 (`<scale>2</scale>`). For fractional scaling, see HiDPI#GNOME.

For GDM, copy the above `~/.config/monitors.xml` to `/var/lib/gdm/.config/monitors.xml` to set the correct rotation.

##### KDE

In System Settings > Display and Monitor, change Orientation to 90° Clockwise, and Scale Display to a comfortable size.

##### Right Click Emulation

Create `/etc/X11/xorg.conf.d/50-trackpoint.conf` to scroll while holding right click:

    /etc/X11/xorg.conf.d/50-trackpoint.conf

    Section "InputClass"
      Identifier      "GPD trackpoint"
      MatchProduct    "SINO WEALTH Gaming Keyboard"
      MatchIsPointer  "on"
      Driver          "libinput"
      Option          "MiddleEmulation" "1"
      Option          "ScrollButton" "3"
      Option          "ScrollMethod" "button"
    EndSection

##### SDDM

To change the DPI to be readable, append the following lines to `/usr/share/sddm/scripts/Xsetup`:

    /usr/share/sddm/scripts/Xsetup

    # Set DPI
    xrandr --dpi 168"

##### Touchscreen Gestures

Install touchegg, then edit the following line in `/usr/share/touchegg/touchegg.conf`:

    /usr/share/touchegg/touchegg.conf

    ...
    <action type="SCROLL">SPEED=7:INVERTED=true</action>
    ...

Create the following file:

    /etc/X11/xinit/xinitrc.d/01_touchegg

    #!/bin/sh

    # starts touchegg application
    PREFIX="$HOME/.config/touchegg/.run"
    mkdir -p "$PREFIX"
    PIDFILE="$PREFIX/touchegg.$USER$DISPLAY.pid"
    LOCK="$PREFIX/touchegg.$USER$DISPLAY.lock"

    start_touchegg() {
            (
                    flock -n 9 || exit 1
                    touchegg 2>/dev/null >/dev/null &
                    PID=$!
                    echo "$!" >"$PIDFILE"
                    wait $PID
            ) 9>"$LOCK"
    }

    start_touchegg &

And make it executable.

#### Fan

With the latest kernel, your fan should work out of the box.

Note: If you are having issues with your fan not functioning as intended, try the following:

    # modprobe -r gpd-pocket-fan
    # modprobe gpd-pocket-fan temp_limits=40000,40001,40002

Once this has been completed, you should hear your fan start up at 40c. If you hear a clicking sound, power off the device, remove the back panel and very gently push the fan around a few times. Then re-attach the panel and power on the device, running the above commands again once logged in. It seems to be an issue with some devices that the fan cannot start properly when it has not been powered on in a while.

Once you have completed these steps and the fan is working properly, you should then either reboot or reload the fan kernel module in order to return the temperature limits to default:

    # modprobe -r gpd-pocket-fan
    # modprobe gpd-pocket-fan

Note: By default, the fan is always spinning when on AC [1]. To override this behavior, add `gpd-pocket-fan.speed_on_ac=0` to the Kernel parameters.

#### Power Saving

Install tlp and then edit following lines in `/etc/default/tlp`:

    /etc/default/tlp

    ...
    # improve disk IO
    DISK_DEVICES="mmcblk0"
    DISK_IOSCHED="deadline"
    ...
    # disable wifi power saving mode (wifi speed drops MASSIVELY!)
    WIFI_PWR_ON_AC=off
    WIFI_PWR_ON_BAT=off
    ...

#### Audio

Pulseaudio needs to be installed for the sound card.

Append the following lines into `/etc/pulse/default.pa`:

    /etc/pulse/default.pa

    set-card-profile alsa_card.platform-cht-bsw-rt5645 HiFi
    set-default-sink alsa_output.platform-cht-bsw-rt5645.HiFi__hw_chtrt5645_0__sink
    set-sink-port alsa_output.platform-cht-bsw-rt5645.HiFi__hw_chtrt5645_0__sink [Out] Speaker

Turn off realtime scheduling by editing `/etc/pulse/daemon.conf`:

    /etc/pulse/daemon.conf

    realtime-scheduling = no

#### Charge control

It is possible to control the charge current, charge end voltage and a few more settings.

See this reddit post for more information and an example script.

## Known Issues

This article or section is out of date.

Reason: No updates have been made to this section since 2021-07-09, are these issue still relevant today? (Discuss in Talk:GPD Pocket)

### Wifi not seeing channels 12/13/14

As of May 2021 with current kernel and firmware versions, the Broadcom 4356 adapter no longer accesses networks on channels beyond the globally-allowed 1-11 range. Setting the regulatory domain with `iw reg set <alpha2>` does not fix this; apparently, the kernel driver does not support this. Instead, edit `/usr/lib/firmware/brcm/brcmfmac4356-pcie.gpd-win-pocket.txt` and change `ccode=X2` to your country (e.g. `ccode=DE` enables channels 12/13 but not 14) and reboot (hint found in an older mailing list message).

## See also

- https://github.com/njkli/gpd-pocket/
- https://hansdegoede.livejournal.com/

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- GPD

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