https://bugzilla.kernel.org/show_bug.cgi?id=36322
--- Comment #8 from Lee, Chun-Yi <j...@novell.com> 2011-05-31 09:20:11 ---
For your brightness control problem, I traced your DSDT, it follow standard
acpi event to notify GFX0 video device to change brightness, acpi video driver
write a value to EC register for brightness level change:
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 */
}
EC must can handle the BLVL changed, but don't know why your brightness control
not work.
If want to confirm the value in BLVL changed by _BCM,
please kindly enable CONFIG_ACPI_EC_DEBUGFS=m, then run Thomas's ec_access
tool:
ftp://ftp.suse.com/pub/people/trenn/sources/ec/
Check value:
./ec_access -b 0x51
Please check the value changed when you press brightness up/down key.
For the acer-wmi part, I will provide a patch to you for support acer-wmi on
your machine.
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