Lenovo Y570 backlight

[matt]

On 09/04/12 07:59, SicoSico wrote:
> Yes, I did. Some values can be changed like 'hw.acpi.video.lcd0.brightness',
> others don't like 'hw.acpi.video.lcd0.active'. The brightness is max in all
> cases.
>
> #kldload acpi_video
>
> #sysctl hw.acpi.video
> hw.acpi.video.crt0.active: 0
> hw.acpi.video.lcd0.active: 0
> hw.acpi.video.lcd0.brightness: 70
> hw.acpi.video.lcd0.fullpower: 70
> hw.acpi.video.lcd0.economy: 30
> hw.acpi.video.lcd0.levels: 70 30 10 17 23 30 40 50 60 70 80 90 100
> hw.acpi.video.ext0.active: 0
> hw.acpi.video.crt1.active: 0
> hw.acpi.video.lcd1.active: 0
> hw.acpi.video.lcd1.brightness: 70
> hw.acpi.video.lcd1.fullpower: 70
> hw.acpi.video.lcd1.economy: 30
> hw.acpi.video.lcd1.levels: 70 30 10 17 23 30 40 50 60 70 80 90 100
> hw.acpi.video.ext1.active: 0
> hw.acpi.video.ext2.active: 0
> hw.acpi.video.ext3.active: 0
> hw.acpi.video.ext4.active: 0
> hw.acpi.video.ext5.active: 0
>
> #sysctl hw.acpi.video.lcd0.active=1
> hw.acpi.video.lcd0.active: 0 -> 0
> #sysctl hw.acpi.video.lcd0.brightness=30
> hw.acpi.video.lcd0.brightness: 70 -> 30
> #sysctl hw.acpi.video.lcd1.active=1
> hw.acpi.video.lcd1.active: 0 -> 0
> #sysctl hw.acpi.video.lcd1.brightness=30
> hw.acpi.video.lcd1.brightness: 70 -> 30
>
>
>
> --
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Are you using KMS? Have you tried xbacklight from ports?

The last shot I can think of beside trying random ACPI handles (You can 
sometimes tell because of checks of \IGD or \PEG that a handle is 
graphics related on at least X220), is to see if there is an address in 
the graphics device's pci space to write a value to with pciconf. I have 
to do something similar on an Asus 1001pxd under debian, sometimes the 
backlight is offset toward high or low, so I do setpci (pciconf is our 
equivalent) XX:YY f4.b=NN where XX:YY is the PCI address and NN is 
16-bit hex value I think. The f4.b part is variable, you'd have to find 
the correct address for your card, and it's possibly quite risky (being 
a user-induced write to the PCI space at goodness knows what address :) 
). This is probably the WrongWayToDoIt (tm) but it may be an option. If 
you see the pciconf manpage, you can see that our equivalent would be 
some variant of pciconf -w

You may have some luck finding this value by digging through (or 
trolling through, whatever floats your boat) Linux forums for backlight 
fixes for your model. I'll take a look at your DSDT if I get a chance.

Matt