http://bugzilla.kernel.org/show_bug.cgi?id=13121
--- Comment #11 from Maxim Levitsky <maximlevit...@gmail.com> 2009-04-18
16:39:19 ---
It is oblivious, why the driver is broken, this is due to bug in acpi table,
that now got exposed, (It was present before, and resuled it brightness going
three levels down, when I pressed brightness down key)
Method (_BQC, 0, NotSerialized)
{
Multiply (\_SB.PCI0.LPC.EC0.BRTS, 0x0A, Local0)
Add (Local0, 0x01, Local0)
Sleep (0x64)
Return (Local0)
}
It should look like that:
Add (Local0, 0x01, Local0)
Multiply (\_SB.PCI0.LPC.EC0.BRTS, 0x0A, Local0)
Sleep (0x64)
Return (Local0)
And if I add 9 to _BQC result, everything work just fine.
What to do next:
- Add a dmi quirk,
- catch similiar errors (if they return x*10+1, and model is acer, then add 9)
- ignore that bug
I have small question, does windows use the acpi video interface?
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