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

[Jesse Barnes]

On Wed, 19 Aug 2009 01:25:57 +0100
Mike Lothian <mike at fireburn.co.uk> wrote:

> 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

Oh, you have a GM45, that should have OpRegion support afaik...  Just
for fun though, can you send me your VBIOS image?

# cd /sys/devices/pci0000\:00/0000\:00\:02.0/
# echo 1 > rom
# cat rom > /tmp/rom.bin
# echo 0 > rom

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center