GPD Pocket

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

To run Arch properly, install gpd-pocket-support and gpd-pocket-alsa-lib from the gpd-pocket-arch repository. Because the patch for alsa-lib is an optional dependency, it must be installed manually to get audio to work.

Manual

WiFi

Install the package gpd-pocket-support-bcm4356-git^AUR 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 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

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 touchegg^AUR, 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.

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
...

Audio

From kernel version 5.5, sof-firmware needs to be installed to have the required firmware 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

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

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/