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-rw-r--r--nixos/modules/services/hardware/throttled.nix6
1 files changed, 6 insertions, 0 deletions
diff --git a/nixos/modules/services/hardware/throttled.nix b/nixos/modules/services/hardware/throttled.nix
index 7617c4492d7..1905eb565c6 100644
--- a/nixos/modules/services/hardware/throttled.nix
+++ b/nixos/modules/services/hardware/throttled.nix
@@ -26,5 +26,11 @@ in {
       if cfg.extraConfig != ""
       then pkgs.writeText "lenovo_fix.conf" cfg.extraConfig
       else "${pkgs.throttled}/etc/lenovo_fix.conf";
+
+    # Kernel 5.9 spams warnings whenever userspace writes to CPU MSRs.
+    # See https://github.com/erpalma/throttled/issues/215
+    boot.kernelParams =
+      optional (versionAtLeast config.boot.kernelPackages.kernel.version "5.9")
+      "msr.allow_writes=on";
   };
 }