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Subject: Re: Lenovo Y570 backlight
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Thanks for your reply Kevin Oberman,

#acpi_call -p '\VBRC' -i 5
Unknown object type '-1515870811'

Here are some values that may be related:

#acpi_call -p '\_SB.PCI0.LPCB.EC0.BRTS'
10
#acpi_call -p '\_SB.PCI0.GFX0.DD02._BCM'
0
#acpi_call -p '\_SB.PCI0.GFX0.DD02._BQC'
0
#acpi_call -p '\_SB.PCI0.GFX0.DD02.LVLS'
10
#acpi_call -p '\_SB.PCI0.GFX0.DD02._BCL'
Unknown object type '4'
#acpi_call -p '\_SB.PCI0.PEG0.VGA.LCD.PLVL'
Unknown object type '4'

\_SB.PCI0.GFX0.DD02._BCM can be changed:
#acpi_call -p '\_SB.PCI0.GFX0.DD02._BCM' -i 4
4

After that \_SB.PCI0.GFX0.DD02._BQC value is changed to 1:
#acpi_call -p '\_SB.PCI0.GFX0.DD02._BQC'
1

But still this has no effect to the brightness.
DSDT files were attached in an earlier post.



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