diff options
Diffstat (limited to 'src/ec/google/chromeec/acpi/keyboard_backlight.asl')
| -rw-r--r-- | src/ec/google/chromeec/acpi/keyboard_backlight.asl | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/ec/google/chromeec/acpi/keyboard_backlight.asl b/src/ec/google/chromeec/acpi/keyboard_backlight.asl index 75a8df3cca..d76bed87ea 100644 --- a/src/ec/google/chromeec/acpi/keyboard_backlight.asl +++ b/src/ec/google/chromeec/acpi/keyboard_backlight.asl @@ -23,6 +23,20 @@ Scope (\_SB) Name (_HID, "GOOG0002") Name (_UID, 1) + /* Ask EC if we even have a backlight + * Return 0xf (present, enabled, show in UI, functioning) or 0 + * + * With older EC codebases that don't support the Device + * Features bitfield, this reports the keyboard backlight as + * enabled since reads to undefined addresses in EC address + * space return 0xff and so KBLE will be 1. + */ + Method (_STA, 0, NotSerialized) + { + Multiply (0xf, \_SB.PCI0.LPCB.EC0.KBLE, Local0) + Return (Local0) + } + /* Read current backlight value */ Method (KBQC, 0, NotSerialized) { |