diff options
| -rw-r--r-- | src/drivers/intel/gma/acpi/configure_brightness_levels.asl | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/src/drivers/intel/gma/acpi/configure_brightness_levels.asl b/src/drivers/intel/gma/acpi/configure_brightness_levels.asl index 0867c5ae06..01642ddc6b 100644 --- a/src/drivers/intel/gma/acpi/configure_brightness_levels.asl +++ b/src/drivers/intel/gma/acpi/configure_brightness_levels.asl @@ -2,6 +2,7 @@ * This file is part of the coreboot project. * * Copyright (C) 2015 Nico Huber <nico.huber@secunet.com> + * Copyright (C) 2018 Nico Huber <nico.h@gmx.de> * Copyright (C) 2018 Patrick Rudolph * * This program is free software; you can redistribute it and/or modify @@ -64,19 +65,21 @@ { Return (Ones) } - If (LEqual(ARDY, Zero)) - { - Return (Ones) - } - /* BCLP requires brightness unsigned 8bit. 255 = 100 % */ + /* Always keep BCLP up to date, even if driver is not ready. + It requires a full 8-bit brightness value. 255 = 100% */ Store (Divide (Multiply (Arg0, 255), 100), Local1) If (LGreater(Local1, 255)) { Store (255, Local1) } - /* set valid bit */ + /* also set valid bit */ Store (Or (Local1, 0x80000000), BCLP) + If (LEqual(ARDY, Zero)) + { + Return (Ones) + } + /* Request back-light change */ Store (0x2, ASLC) /* Trigger IRQ */ |