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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>
This commit is contained in:
David Anderson 2020-03-14 20:55:05 -07:00
parent 9f6d639110
commit 03dedf4cfd
1 changed files with 5 additions and 0 deletions
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5
lenovo/thinkpad/t495/default.nix
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@ -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;
}