diff options
author | David Anderson <dave@natulte.net> | 2020-03-14 20:55:05 -0700 |
---|---|---|
committer | David Anderson <dave@natulte.net> | 2020-03-14 20:57:22 -0700 |
commit | 03dedf4cfd6762810b08b452258dd64e6584259a (patch) | |
tree | 9b914006229313a44283a06a828847cc254251a7 | |
parent | 9f6d639110ace24914a7459e445a3e6322e49266 (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.nix | 5 |
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; } |