http://bugzilla.kernel.org/show_bug.cgi?id=9902
[EMAIL PROTECTED] changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDINFO |REJECTED
Resolution| |WILL_NOT_FIX
------- Comment #28 from [EMAIL PROTECTED] 2008-07-06 23:45 -------
(In reply to comment #26)
> if acpi_osi="!Windows 2006", the AML code uses the legacy way (poking LBB
> register in the graphics device's pci config space) to change the backlight
> directly.
>
this is wrong, sorry, I mixed it up with another bug.
the AML code pokes the EC address space to change the backlight in your laptop.
/proc/acpi/video/GFX0/DD02/brightness:levels: 75 13 13 25 38 50 63 75 88 100
/proc/acpi/video/GFX0/DD02/brightness:current: 13
/proc/acpi/video/GFX0/DD02/info:device_id: 0x0410
This is the LCD device and the AML code tries to send ACPI event to this
device.
But the stupid AML code keeps on looking for a device with device equals
0x0400, and of course it fails all the time.
If (LEqual (And (0xFFFF, DID1), 0x0400))
{
Notify (^^^GFX0.DD01, 0x86)
}
If (LEqual (And (0xFFFF, DID2), 0x0400))
{
Notify (^^^GFX0.DD02, 0x86)
}
If (LEqual (And (0xFFFF, DID3), 0x0400))
{
Notify (^^^GFX0.DD03, 0x86)
}
If (LEqual (And (0xFFFF, DID4), 0x0400))
{
Notify (^^^GFX0.DD04, 0x86)
}
If (LEqual (And (0xFFFF, DID5), 0x0400))
{
Notify (^^^GFX0.DD05, 0x86)
}
Given that the BIOS already knows DD02 is the LCD (it exports _BCM/_BCL method
for DD02), it's really stupid to check the device id again to decide which
device to send the ACPI event to.
So this is rather a BIOS bug than a Linux kernel problem to me.
Unfortunately, we can not use the customized DSDT for your laptop, as there are
too many errors when compiling it.
Maximum error count (200) exceeded
ASL Input: DSDT.dsl - 6378 lines, 214236 bytes, 2473 keywords
Compilation complete. 201 Errors, 0 Warnings, 1 Remarks, 4 Optimizations
Maximum error count (200) exceeded
Segmentation fault
IMO, you should look for some BIOS update to get this problem fixed.
I'll reject this bug as we WILL_NOT_FIX it in Linux kernel.
Please reopen it if you still have some problems.
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