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-rw-r--r--src/drivers/intel/gma/acpi/configure_brightness_levels.asl87
1 files changed, 36 insertions, 51 deletions
diff --git a/src/drivers/intel/gma/acpi/configure_brightness_levels.asl b/src/drivers/intel/gma/acpi/configure_brightness_levels.asl
index 01642ddc6b..dfd878cb26 100644
--- a/src/drivers/intel/gma/acpi/configure_brightness_levels.asl
+++ b/src/drivers/intel/gma/acpi/configure_brightness_levels.asl
@@ -98,36 +98,6 @@
Return (Ones)
}
-
- /*
- * Get current back-light brightness through mailbox 3
- *
- * @Return The current brightness or Ones on error
- * Errors: * ASLS is zero
- * * Mailbox 3 support not advertised
- * * Driver not loaded or not ready
- * * CBLV is not marked valid
- */
- Method (XBQC, 0, NotSerialized)
- {
- If (LEqual(ASLS, Zero))
- {
- Return (Ones)
- }
- If (LEqual(And(MBOX, 0x4), Zero))
- {
- Return (Ones)
- }
- If (LEqual(ARDY, Zero))
- {
- Return (Ones)
- }
- If (LEqual(And (CBLV, 0x80000000), Zero))
- {
- Return (Ones)
- }
- Return (And (CBLV, 0xff))
- }
}
/*
@@ -137,29 +107,45 @@
{
Name (_ADR, 0)
+ /* Divide round closest */
+ Method (DRCL, 2)
+ {
+ Return (Divide (Add (Arg0, Divide (Arg1, 2)), Arg1))
+ }
+
Method (XBCM, 1, NotSerialized)
{
- Store (Divide (Multiply (Arg0, BCLM), 100), BCLV)
+ Store (DRCL (Multiply (Arg0, BCLM), 100), BCLV)
}
+ /* Find value closest to BCLV in BRIG (which must be ordered) */
Method (XBQC, 0, NotSerialized)
{
- /* 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)))
+ /* Local0: current percentage */
+ Store (DRCL (Multiply (BCLV, 100), BCLM), Local0)
+
+ /* Local1: loop index (selectable values start at 2 in BRIG) */
+ Store (2, Local1)
+ While (LLess (Local1, Subtract (SizeOf (BRIG), 1))) {
+ /* Local[23]: adjacent values in BRIG */
+ Store (DeRefOf (Index (BRIG, Local1)), Local2)
+ Store (DeRefOf (Index (BRIG, Add (Local1, 1))), Local3)
+
+ If (LLess (Local0, Local3)) {
+ If (LOr (LLess (Local0, Local2),
+ LLess (Subtract (Local0, Local2),
+ Subtract (Local3, Local0)))) {
+ Return (Local2)
+ } Else {
+ Return (Local3)
+ }
}
- Add (Local2, 1, Local2)
+
+ Increment (Local1)
}
+
/* Didn't find greater/equal value: use the last */
- Return (DeRefOf (Index (BRIG, Local2)))
+ Return (Local3)
}
}
@@ -173,11 +159,10 @@
Method (XBQC, 0, NotSerialized)
{
- Store (^BOX3.XBQC (), Local0)
- If (LEqual(Local0, Ones))
- {
- Store (^LEGA.XBQC (), Local0)
- }
-
- Return (Local0)
+ /*
+ * Always query the hardware directly. Not all OS drivers
+ * keep CBLV up to date (one is Linux' i915). Some years
+ * after that is fixed we can probably use CBLV?
+ */
+ Return (^LEGA.XBQC ())
}