On Sun, 10 Oct 2010 08:29:52 +0700, Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx> wrote:
> On Sat, Oct 9, 2010 at 14:46, Ali Polatel <alip@xxxxxxxxxxx> wrote:
> > Hi everyone,
> >
> > I want to write laptop extras for my laptop so that changing brightness
> > of the screen etc. are supported by Linux.
>
> I am just thinking, how about starting with how xbacklight works and
> see its source code? :)
Well xbacklight doesn't work at all on this box:
$> xbacklight
No outputs have backlight property
Let me give a bit more detail about the ACPI properties:
$> tree --charset=ascii /proc/acpi/video
/proc/acpi/video
`-- VGA1
|-- CRT
| |-- brightness
| |-- EDID
| |-- info
| `-- state
|-- DOS
|-- HDMI
| |-- brightness
| |-- EDID
| |-- info
| `-- state
|-- info
|-- LCD
| |-- brightness
| |-- EDID
| |-- info
| `-- state
|-- POST
|-- POST_info
`-- ROM
4 directories, 17 files
$> cat /proc/acpi/video/VGA1/*/brightness
<not supported>
<not supported>
<not supported>
$> cat /proc/acpi/video/VGA1/*/info
device_id: 0x0100
type: CRT
known by bios: no
device_id: 0x0121
type: UNKNOWN
known by bios: no
device_id: 0x0110
type: LCD
known by bios: no
As you can see, the brightness property of VGA1 is not supported.
> --
> regards,
>
> Mulyadi Santosa
> Freelance Linux trainer and consultant
>
> blog: the-hydra.blogspot.com
> training: mulyaditraining.blogspot.com
>
--
Regards,
Ali Polatel
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