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authorDavid Anderson <dave@natulte.net>2020-03-14 20:55:05 -0700
committerDavid Anderson <dave@natulte.net>2020-03-14 20:57:22 -0700
commit03dedf4cfd6762810b08b452258dd64e6584259a (patch)
tree9b914006229313a44283a06a828847cc254251a7
parent9f6d639110ace24914a7459e445a3e6322e49266 (diff)
thinkpad/t495: fix backlight save/load and and battery conditioning.
Saving/loading the backlight state requires the acpi_backlight=native kernel parameter. acpi_call is required by TLP to get access to battery conditioning information from the firmware. Signed-off-by: David Anderson <dave@natulte.net>
-rw-r--r--lenovo/thinkpad/t495/default.nix5
1 files changed, 5 insertions, 0 deletions
diff --git a/lenovo/thinkpad/t495/default.nix b/lenovo/thinkpad/t495/default.nix
index 51ddb5c..64957e6 100644
--- a/lenovo/thinkpad/t495/default.nix
+++ b/lenovo/thinkpad/t495/default.nix
@@ -4,8 +4,13 @@
imports = [
../.
../../../common/cpu/amd
+ ../../../common/pc/laptop/acpi_call.nix
];
+ # Force use of the thinkpad_acpi driver for backlight control.
+ # This allows the backlight save/load systemd service to work.
+ boot.kernelParams = [ "acpi_backlight=native" ];
+
# see https://github.com/NixOS/nixpkgs/issues/69289
boot.kernelPackages = lib.mkIf (lib.versionOlder pkgs.linux.version "5.2") pkgs.linuxPackages_latest;
}