gpd/pocket-4: init

[miangraham]

Description of changes

Here's a Pocket 4 first pass based on the Pocket 3 setup.

I'm testing this on the Pocket 4 with AI 9 HX 370 using NixOS 24.11 and mainline kernel 6.12. Apart from the display rotation needed in kernel params and WM settings like the Pocket 3, basic desktop stuff seems to just work.

Verified so far:

• Audio
• Bluetooth
• Camera: Works. Tested in OBS
• Display: Built-in screen is on and oriented properly in stage-1 before LUKS passphrase. Sway requires WM-side rotation, not sure about other GUI envs.
• DisplayPort over USB-C: Works
• HDMI: Works. Auto-detects on hotplug and comes back after suspend. On in time for passphrase.
• Internet via RJ45
• MicroSD reader module: Works.
• Mouse: Built-in touchpad and click buttons work fine.
• P-States enabled, EPP settings available
• Suspend and resume (systemctl suspend with default BIOS)
• Touchscreen: Works
• USB ports: All working
• Video: Hardware decoding in mpv and chrome
• Wifi

Not working:

❌ Fingerprint Reader: HOLTEK FocalTech Fingerprint Device. No driver support yet. Places to watch: 1, 2

Untested:

❓ Optional hardware modules (KVM, serial, LTE). I don't have any of these to try out. YMMV.

Things done

• Tested the changes in your own NixOS Configuration
• Tested the changes end-to-end by using your fork of nixos-hardware and
  importing it via <nixos-hardware> or Flake input

[miangraham]

Should be good to go! System's working great.

[LucasFA]

I don't have the hardware to test this, but seems like an interesting computer. My suggestions are based purely on the specs.

[miangraham]

P-States flipped on and briefly tested. I don't have the cycles to do extended power investigation, but they're enabled and not hurting anything. Quick results with otherwise default settings:

$ dmesg | grep "Kernel command line"
[    0.041247] Kernel command line: initrd=\EFI\nixos\g219bvi25xmzhv2qjx5wxa6n2w0342hw-initrd-linux-6.12.9-initrd.efi init=/nix/store/mhwmka1j2wrr8cwvd5nic6qma20zl20c-nixos-system-yuuri-24.11.20250115.e24b4c0/init amd_pstate=active fbcon=rotate:1 video=eDP-1:panel_orientation=right_side_up loglevel=4

$ cat /sys/firmware/acpi/platform_profile_choices
low-power balanced performance

$ cat /sys/firmware/acpi/platform_profile
balanced

$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
performance powersave

$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
powersave

$ cat /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_available_preferences
default performance balance_performance balance_power power

$ cat /sys/devices/system/cpu/cpu0/cpufreq/energy_performance_preference
balance_power

Not sure why there's no schedutil governor. Kernel support maybe not there yet? powersave geekbenches at 4% below performance with 0.2W idle battery draw savings, which seems perfectly reasonable as a default so no governor changes made here.

[Mic92]

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[Mic92]

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