[Intel-gfx] Legacy backlight control with KMS and BACKLIGHT property

[Mike Lothian]

2009/8/18 Jesse Barnes <jbarnes at virtuousgeek.org>:
> On Mon, 17 Aug 2009 01:41:03 +0100
> Mike Lothian <mike at fireburn.co.uk> wrote:
>> You are an absolute STAR Greg!!!
>>
>> Finally I have brightness control for this laptop on Linux
>>
>> I needed to set the DMI names to "R510/P510" and the pci device to
>> 0x2a42 but apart from that it works!!!
>>
>> Now I just have to get the keys working :D
>
> Any chance I could get you to test this patch out?  It should add an
> "i915-backlight" interface to sysfs instead, but hopefully will work
> similarly otherwise...
>
> Thanks,
> --
> Jesse Barnes, Intel Open Source Technology Center
>

Sorry I tried this on the latest tip from Linus and it has no effect

It might be because I do have acpi video (with or without the patch)
it just doesn't do anything when I change the values

Let me know if there are any logs you need, parameters I need to pass
or other patches to try

Thanks

Mike