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

@@ -12,18 +12,21 @@
       url = "git+https://git.lix.systems/lix-project/lix?ref=main";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    nixpkgs-uconsole.url = "github:NixOS/nixpkgs/nixos-25.11";
     nixos-uconsole = {
-      url = "github:nixos-uconsole/nixos-uconsole";
+      url = "github:nixos-uconsole/nixos-uconsole/v1.1.0";
-      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.nixpkgs.follows = "nixpkgs-uconsole";
+      inputs.nixos-raspberrypi.follows = "nixos-raspberrypi";
     };
     nixos-raspberrypi = {
-      url = "github:nvmd/nixos-raspberrypi/v1.20260517.0";
+      url = "github:gortium/nixos-raspberrypi/cm5-cross-v1";
-      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.nixpkgs.follows = "nixpkgs-uconsole";
     };
-    self.submodules = true;
   };
 
-  outputs = { self, nixpkgs, agenix, 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;
@@ -34,20 +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 = [
+        config.permittedInsecurePackages = [ "openclaw-2026.3.12" ];
-          "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; };
@@ -56,9 +55,7 @@
               nixpkgs.overlays = overlays;
               nixpkgs.config.allowUnfree = true;
               nixpkgs.config.rocmSupport = true;
-                nixpkgs.config.permittedInsecurePackages = [
+              nixpkgs.config.permittedInsecurePackages = [ "openclaw-2026.3.12" ];
-                  "openclaw-2026.3.12"
-                ];
               nix.package = lix.packages.${system}.default;
             }
             agenix.nixosModules.default
@@ -89,22 +86,71 @@
           ];
         };
 
-          uConsole = nixos-raspberrypi.lib.nixosSystem {
+        uconsole-cm5 = nixpkgs-uconsole.lib.nixosSystem {
-            specialArgs = { inherit self keys paths inputs nixos-raspberrypi; };
+          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.config.allowUnfree = true;
               nixpkgs.hostPlatform = "aarch64-linux";
-                nix.package = lix.packages."aarch64-linux".default;
+              nixpkgs.config.allowUnfree = true;
+              boot.loader.raspberry-pi.bootloader = "kernel";
             }
+            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
-              ./hosts/uConsole/configuration.nix
+            ({ config, lib, pkgs, inputs, ... }: let
-              ./hosts/uConsole/hardware-configuration.nix
+              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;
+      };
     };
 }

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);