Some additional information to #12:
The original code is as below, and it checks BRTW as in #12
Method (_BCM, 1, NotSerialized)
{
Store (Match (\_SB.PCI0.LPC.EC.BRTW, MEQ, Arg0, MTR, 0x00, 0x02),
Local0)
If (LNotEqual (Local0, Ones))
{
Subtract (Local0, 0x02, Local1)
Store (Local1, \BRLV)
\_SB.PCI0.LPC.EC.BRNS (\UCMS (0x16))
}
}
It can be done by modifying it to something like below:
Method (_BCM, 1, NotSerialized)
{
Subtract (Local0, 0x02, Local1)
Store (Local1, \BRLV)
\_SB.PCI0.LPC.EC.BRNS (\UCMS (0x16))
}
This will ignore the table comparing.
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https://bugs.launchpad.net/bugs/1270079
Title:
[Lenovo T540p, W540] Backlight interfaces not fully working
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