From 262146dc7631b962b515e7e972930f6e12607d7f Mon Sep 17 00:00:00 2001
From: ChaosAttractor <46527539+LostAttractor@users.noreply.github.com>
Date: Fri, 16 Dec 2022 07:59:45 +0800
Subject: [PATCH] Override edid of built-in display
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Fix the problem that the edid of the built-in display only provided 60hz mode when use Hybrid Graphics

It appears to be a Lenovo firmware issue and i try to fix it. This issue still reproducible on BIOS version GKCN58WW(22/12/16)
Lenovo Legion 5 Pro is a laptop which support a technology called "DDG" that can allow you switch between discrete graphics mode and hybrid mode (optiums).
In discrete graphics mode, the firmware provides the correct edid and anything works fine, the built-in display work well at 165hz.
But if switch to hybrid mode, the firmware provides a different edid, causing the built-in display only can work at 60hz.
So I extracted the edid file of discrete graphics mode and override the edid that built-in display provide to solve this problem.

Co-Authored-By: Jörg Thalheim <Mic92@users.noreply.github.com>
---
 lenovo/legion/16ach6h/default.nix      |   3 +++
 lenovo/legion/16ach6h/edid/16ach6h.bin | Bin 0 -> 384 bytes
 lenovo/legion/16ach6h/edid/default.nix |  15 +++++++++++++++
 3 files changed, 18 insertions(+)
 create mode 100644 lenovo/legion/16ach6h/edid/16ach6h.bin
 create mode 100644 lenovo/legion/16ach6h/edid/default.nix

diff --git a/lenovo/legion/16ach6h/default.nix b/lenovo/legion/16ach6h/default.nix
index db13b9f..afdc7d9 100644
--- a/lenovo/legion/16ach6h/default.nix
+++ b/lenovo/legion/16ach6h/default.nix
@@ -7,8 +7,11 @@
     ../../../common/gpu/nvidia/prime.nix
     ../../../common/pc/laptop
     ../../../common/pc/laptop/ssd
+    ./edid
   ];
 
+  hardware.amdgpu.loadInInitrd = lib.mkDefault false;
+
   hardware.nvidia.prime = {
     amdgpuBusId = "PCI:6:0:0";
     nvidiaBusId = "PCI:1:0:0";
diff --git a/lenovo/legion/16ach6h/edid/16ach6h.bin b/lenovo/legion/16ach6h/edid/16ach6h.bin
new file mode 100644
index 0000000000000000000000000000000000000000..87256135d9cf7597594d013d06d1814148d2f91e
GIT binary patch
literal 384
zcmZSh4+ac;`3zzVARx!cvQ<f}g8ALl#UVa3)%XKKfP#!@ATN($!2*Yt1Oo*#hREvz
z3=9%LMSpp0mdeZfF>)z@0Z`;0gLANdh(d@lL<lV6>*sD@VD92*sB6fjz{JGFEX(ki
zwSnOo8!Ka0mP)P^0|OJY%~A%IER`%3pavR){{_O83=GVSB5U*+TmN&;XV7PmXRv2$
QW?*7qrLol@<IN`k0G=-?0RR91

literal 0
HcmV?d00001

diff --git a/lenovo/legion/16ach6h/edid/default.nix b/lenovo/legion/16ach6h/edid/default.nix
new file mode 100644
index 0000000..d9d8b52
--- /dev/null
+++ b/lenovo/legion/16ach6h/edid/default.nix
@@ -0,0 +1,15 @@
+{ config, pkgs, lib, ...}:
+
+let
+  # This file was obtained from the display while "DDG" mode was enabled.
+  chip_edid = pkgs.runCommandNoCC "chip_edid" { } ''
+    mkdir -p $out/lib/firmware/edid
+    cp ${./16ach6h.bin} $out/lib/firmware/edid/16ach6h.bin
+  '';
+in
+{
+  hardware.firmware = [ chip_edid ];
+
+  boot.kernelParams = [ "drm.edid_firmware=edid/16ach6h.bin" ];
+  boot.initrd.extraFiles."lib/firmware/edid/16ach6h.bin".source = pkgs.runCommandLocal "chip_edid" { } "cp ${./16ach6h.bin} $out";
+}
\ No newline at end of file