http://bugzilla.kernel.org/show_bug.cgi?id=11095
[EMAIL PROTECTED] changed:
What |Removed |Added
----------------------------------------------------------------------------
CC|acpi- |[EMAIL PROTECTED],
|[EMAIL PROTECTED]|[EMAIL PROTECTED]
|et |
AssignedTo|[EMAIL PROTECTED] |[EMAIL PROTECTED]
| |bugs.osdl.org
Status|NEEDINFO |NEW
Component|Platform-Drivers |Video(Other)
Product|ACPI |Drivers
Summary|no brigthness control - Sony|IGD OpRegion doesn't work -
|Vaio SZ61MN |Sony Vaio SZ61MN
------- Comment #25 from [EMAIL PROTECTED] 2008-12-09 23:37 -------
I can reproduce this problem on a Sony VGN Z540.
here is the AML code path when invoking _BCM method,
Store ("Arg0", Debug)
Store (Arg0, Debug)
Store ("Arg1", Debug)
Store (Arg1, Debug)
Store (Arg1, BCLP)
Or (BCLP, 0x80000000, BCLP)
Store (0x02, ASLC)
IMO, this is a IGD OpRegion problem.
when I run echo {0,4,8} > /sys/class/backlight/acpi_video0/brightness,
I got this in dmesg
[ 875.931991] [ACPI Debug] String [0x04] "Arg0"
[ 875.933758] [ACPI Debug] Integer 0x00000001
[ 875.933826] [ACPI Debug] String [0x04] "Arg1"
[ 875.933891] [ACPI Debug] Integer 0x00000008
[ 880.088142] [ACPI Debug] String [0x04] "Arg0"
[ 880.089780] [ACPI Debug] Integer 0x00000001
[ 880.089845] [ACPI Debug] String [0x04] "Arg1"
[ 880.089908] [ACPI Debug] Integer 0x0000002A
[ 884.249103] [ACPI Debug] String [0x04] "Arg0"
[ 884.249170] [ACPI Debug] Integer 0x00000001
[ 884.249230] [ACPI Debug] String [0x04] "Arg1"
[ 884.249289] [ACPI Debug] Integer 0x000000FF
it seems that the AML code has sent a notification to the graphics driver, but
the graphics driver doesn't change the backlight correctly. right?
cc Matthew and Jesse.
~
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