GPD Pocket - ArchWiki

# GPD Pocket

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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

## Installation

### Automatic

You can download a pre-patched ISO from here.

### Manual

Because WiFi is not working with the default configuration, you have to fix WiFi first(see #WiFi), or use a supported USB Ethernet/WiFi dongle.

## Configuration

### Automatic

During install append the following to /etc/pacman.conf:

    /etc/pacman.conf

    ...
    [gpd-pocket-arch]
    SigLevel = Never
    Server = https://github.com/joshskidmore/gpd-pocket-arch/raw/master
    ...

Install the changes necessary for the GPD Pocket to run Arch properly by running:

`# pacman -Syu gpd-pocket-support`

Because the patch for alsa-lib is an optional dependency, it must be installed manually to get audio to work:

`# pacman -S gpd-pocket-alsa-lib`

### Manual

#### WiFi

Install the package gpd-pocket-support-bcm4356-gitAUR and reload the WiFi kernel module:

    # modprobe -r brcmfmac
    # modprobe brcmfmac

#### Backlight and KMS

In order to enable backlight control with early KMS change `/etc/mkinitcpio.conf` to match the following:

    /etc/mkinitcpio.conf

    ...
    MODULES=(pwm_lpss pwm_lpss_platform i915)
    ...

#### 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) does not expose these configurations properly. However, the regarding functionality is still available in `libinput`. Since these compositors normally loads `/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` (modesetting) or `DSI1` (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

Change 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 toucheggAUR, 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 `/etc/X11/xinit/xinitrc.d/01_touchegg`

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

Set the permissions on `/etc/X11/xinit/xinitrc.d/01_touchegg`

    # chmod 0755 /etc/X11/xinit/xinitrc.d/01_touchegg

##### Making use of 半/全 key on Pocket 2

Out of the box the `半/全` key is configured to send the ``` symbol and keycode 49, making it a duplicated of a regular ``/~` key. In order to be able to map it to something more useful go to the GPD2 Firmware and download "GPD Pocket 2 Keyboard Firmware (Japan)". This must be flashed with the Windows 10 OS supplied with the device. It is advised to have a USB mouse, since the keyboard and mouse will be disabled during the update.

After the update is done `半/全` will send keycode 49 and ``` symbol, while the dedicated ``/~` key will send keycode 132. In order to fix this create a file `~/.Xmodmap`

    ~/.Xmodmap

    keycode  132 = grave asciitilde
    keycode  49  = XF86Launch1 NoSymbol

Test it immediately

    $ xmodmap ~/.Xmodmap

For more information read xmodmap

#### 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 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
    ...

#### PulseAudio

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

#### USB-C Power source status

USB-C power source status does not work on Kernel 4.14-15. Hans' kernel has a patch fixing this.

#### systemd-gpt-auto-generator failed to dissect

Due to this issue, an error message appears at boot:

`systemd-gpt-auto-generator[199]: Failed to dissect: Input/output error`.

To avoid the error message, add this boot parameter to your boot loader.

    systemd.gpt_auto=0

## See also

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

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