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

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

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/