Just disassembled laptop's DSDT, there a 3 device LCDD descriptors. All have
method _BCL.
First 2 instances:
Device (LCDD)
{
...
Method (_BCL, 0, NotSerialized)
{
Return (Package (0x10)
{
0x0F,
0x0E,
0x0D,
0x0C,
0x0B,
0x0A,
0x09,
0x08,
0x07,
0x06,
0x05,
0x04,
0x03,
0x02,
One,
Zero
})
}
...
}
And here is third one:
Device (LCDD)
{
...
Method (_BCL, 0, NotSerialized)
{
Return (Package (0x09)
{
0x08,
0x07,
0x06,
0x05,
0x04,
0x03,
0x02,
One,
Zero
})
}
...
}
As far as I understand, this causes backlight control problems and
modifying first 2 instances to be like 3d one will fix problem without
kernel modification (by overriding DSDT in initrd)?
--
Random reaction to brightness hotkeys
https://bugs.launchpad.net/bugs/376924
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