Dear NixOS community,
I’m struggling to get the official Raspberrypi 7" touchscreen to work on a Raspberry Pi 4.
On Raspbian it works out of the box but on NixOS only the display output works.
The touchscreen isn’t recognized as input device…
xinput list on NixOS:
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Cherry USB Keyboard id=6 [slave keyboard (3)]
↳ Cherry USB Keyboard System Control id=7 [slave keyboard (3)]
↳ Cherry USB Keyboard Consumer Control id=8 [slave keyboard (3)]
xinput list on Raspbian:
pi@raspberrypi:~ $ DISPLAY=:0.0 xinput -list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ FT5406 memory based driver id=7 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Cherry GmbH SmartBoard XX44 id=6 [slave keyboard (3)]
The NixOS installation was done by following this guide so the current configuration looks similar:
{ config, pkgs, lib, ... }:
let
user = "guest";
password = "guest";
hostname = "nixos";
in {
imports = ["${fetchTarball "https://github.com/NixOS/nixos-hardware/archive/342048461da7fc743e588ee744080c045613a226.tar.gz" }/raspberry-pi/4"];
fileSystems = {
"/" = {
device = "/dev/disk/by-label/NIXOS_SD";
fsType = "ext4";
options = [ "noatime" ];
};
};
networking.networkmanager.enable = true;
environment.systemPackages = with pkgs; [
vim
];
services.openssh.enable = true;
users = {
mutableUsers = false;
users."${user}" = {
isNormalUser = true;
password = password;
extraGroups = [ "networkmanager" "wheel" ];
};
};
# Enable GPU acceleration
hardware.raspberry-pi."4".fkms-3d.enable = true;
services.xserver = {
enable = true;
displayManager.lightdm.enable = true;
desktopManager.xfce.enable = true;
};
hardware.pulseaudio.enable = true;
}
The config.txt file on the boot partition wasn’t changed.
I recognized that the kernel version differs (NixOS: 5.10.52, Raspbian: 4.19.97-v7+).
Does this have something to do with it?
The drivers for the official touchscreen should be in the mainline kernel since 4.21 (source).
Or is a kernel module missing?
And did anybody manage to successfully use a touchscreen with NixOS on the Raspberry Pi 4?
Thanks in advance and best regards!