diff options
Diffstat (limited to 'src/drivers/intel/gma')
| -rw-r--r-- | src/drivers/intel/gma/acpi/configure_brightness_levels.asl | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/src/drivers/intel/gma/acpi/configure_brightness_levels.asl b/src/drivers/intel/gma/acpi/configure_brightness_levels.asl index 8625f04a9f..0867c5ae06 100644 --- a/src/drivers/intel/gma/acpi/configure_brightness_levels.asl +++ b/src/drivers/intel/gma/acpi/configure_brightness_levels.asl @@ -69,7 +69,14 @@ Return (Ones) } - Store (Or (Arg0, 0x80000000), BCLP) + /* BCLP requires brightness unsigned 8bit. 255 = 100 % */ + Store (Divide (Multiply (Arg0, 255), 100), Local1) + If (LGreater(Local1, 255)) { + Store (255, Local1) + } + /* set valid bit */ + Store (Or (Local1, 0x80000000), BCLP) + /* Request back-light change */ Store (0x2, ASLC) /* Trigger IRQ */ |