https://bugzilla.kernel.org/show_bug.cgi?id=36322
--- Comment #19 from Lee, Chun-Yi <j...@novell.com> 2011-06-03 23:52:31 ---
Hi Thomas,
(In reply to comment #16)
> Adding Matthew and Rui, they might know more and may be able to help about
> OpRegion, _OSI("Windows 2009") brightness issues/regressions.
In comment #8, _BCM have logic to write value to BLVL register on EC0:
Method (OBCM, 1, NotSerialized)
{
Store ("_BCM : Arg0 = ", Debug)
Store (Arg0, Debug)
Store (Subtract (Divide (Arg0, 0x0A, ), One), Local0)
Store (Local0, BRTN)
Store (Local0, ^LPCB.EC0.BLVL) /* change */
}
I thought EC must to read the BLVL register when it modified then change LCD
panel's brightness level, that means LVDS must wired to EC.
Do you have any idea why EC didn't change brightness level when BLVL changed?
or my understand is totally wrong?
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