From d1a07fc978b60be77721d9ad842e987fecd18cfa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?m=C3=BCde?= <git@darkest.space>
Date: Fri, 9 Oct 2026 00:05:52 +0200
Subject: [PATCH] maybe fix flaky power management

---
 nixosConfigurations/muede-lpt2/hardware.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/nixosConfigurations/muede-lpt2/hardware.nix b/nixosConfigurations/muede-lpt2/hardware.nix
index 175a168..6e7557d 100644
--- a/nixosConfigurations/muede-lpt2/hardware.nix
+++ b/nixosConfigurations/muede-lpt2/hardware.nix
@@ -14,6 +14,9 @@
   boot = {
     kernelPackages = pkgs.linuxPackages_zen;
     supportedFilesystems = [ "btrfs" ];
+    # Samsung 990 PRO dropped off the bus (CSTS=0x1, reset failed) on 2026-10-03;
+    # disable APST so the controller never enters deep power states.
+    kernelParams = [ "nvme_core.default_ps_max_latency_us=0" ];
     initrd = {
       supportedFilesystems = [ "btrfs" ];
       availableKernelModules = [
@@ -49,6 +52,10 @@
     }
   ];
 
+  boot.extraModprobeConfig = ''
+    options snd_hda_intel power_save=0 power_save_controller=N
+  '';
+
   services.thermald.enable = true;
   services.hardware.bolt.enable = true; # thunderbolt security