diff options
Diffstat (limited to 'src/drivers/intel/gma/acpi/brightness_levels.asl')
| -rw-r--r-- | src/drivers/intel/gma/acpi/brightness_levels.asl | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/src/drivers/intel/gma/acpi/brightness_levels.asl b/src/drivers/intel/gma/acpi/brightness_levels.asl index c186989fda..d0e70a9418 100644 --- a/src/drivers/intel/gma/acpi/brightness_levels.asl +++ b/src/drivers/intel/gma/acpi/brightness_levels.asl @@ -22,14 +22,25 @@ Method (XBCM, 1, NotSerialized) { - Store (ShiftLeft (Arg0, 4), BCLV) - Store (0x80000000, CR1) - Store (0x0610, BCLM) + Store (Divide (Multiply (Arg0, BCLM), 100), BCLV) } Method (XBQC, 0, NotSerialized) { - Store (BCLV, Local0) - ShiftRight (Local0, 4, Local0) - Return (Local0) + /* Find value close to BCLV in BRIG (which must be ordered) */ + Store (BCLV, Local0) // Current value + Store (BCLM, Local1) // For calculations + Store (2, Local2) // Loop index + While (LLess (Local2, Subtract (SizeOf (BRIG), 1))) { + Store (DeRefOf (Index (BRIG, Local2)), Local3) + /* Use same calculation as XBCM, to get exact matches */ + Store (Divide (Multiply (Local3, Local1), 100), Local3) + + If (LLessEqual (Local0, Local3)) { + Return (DeRefOf (Index (BRIG, Local2))) + } + Add (Local2, 1, Local2) + } + /* Didn't find greater/equal value: use the last */ + Return (DeRefOf (Index (BRIG, Local2))) } |