[Pommed-devel] backlight support for macbook rev 3

[Steffen Schulz]

On 070727 at 00:00, Julien BLACHE wrote:
> Steffen Schulz <pepe at cbg.dyndns.org> wrote:
> >> Very interesting. Do you know if reading back the current backlight
> >> level works ? If not it's not usable for pommed, unfortunately.
> >
> > Yes this works. I just tested the borders, a value of 0 will switch the
> > backlight off and 15 looks pretty much like the maximum.
> Great ! Do you have something under /proc/acpi/video/ ?

Nope. It works without loading the acpi video module, which from the
kernel doc is only a reference implementation anyway.

When I load the driver with modprobe video, I get:

vger:/proc/acpi/video/GFX0# ls
DOS  info  LCD/  POST  POST_info  ROM  TV/  VGA/

cat */*
<not supported>
<not supported>
device_id:    0x0400
type:         LCD
known by bios: yes
state:     0x1f
query:     0x01
<not supported>
<not supported>
device_id:    0x0200
type:         TVOUT
known by bios: yes
state:     0x1d
query:     0x00
<not supported>
<not supported>
device_id:    0x0300
type:         DVI
known by bios: yes
state:     0x1d
query:     0x00

eg:
cat /proc/acpi/video/GFX0/LCD/brightness 
 <not supported>

There is also nothing in /sys either, except for the keyboard backlight.
Nothing in these files changes when I adjust the backlight.


> > vger:/home/pepe# cat /sys/class/hwmon/hwmon2/device/light 
> > (119,75)
> 
> /sys/devices/platform/applesmc/light is what pommed uses, here

For whatever reason, it is named 'applesmc.768' here.
Latest mactel-patches from svn.


/steffen
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