On Mon, Feb 23, 2009 at 9:57 PM, Damian <damian.o...@gmail.com> wrote:
> Hi Sebastian,
>
>> acpi_os-name = "Linux" as kernel parameter might help.
> Ok, I've changed the grub menu.lst file. After the reboot I will write
> if something changes.
Nope :(
>>
>> and take a look if /sys/class/backlight/acpi_video0/ is present:
>> this is the kernel interface to set the brightness.
> I have it, but running
> cho 2 > /sys/class/backlight/acpi_video0/brightness
> has no effect in the display brightness.
>
>> CONFIG_BACKLIGHT_LCD_SUPPORT
>>
>> is the appropriate kernel config category to look at in recent kernels.
> Yes, that variable is set.
>
>> BTW which kernel are you using?
> 2.6.27-r2
>
>> No doubt: the first dimms the videocard output, the latter the LCD.
> I didn't know the reasons for this "missmatch", thanks a lot for this
> brief but useful explanation.
>
>> You can use xev to see which keycode is emmitted and then look in your
>> desktop environment if this is match with some action.
> In fact, Fn + dimming keys produces output. Now, to do something
> useful, I need to know how to dim the light of the LCD.
>
>> Well. it should be somehow applicable, because it is rather generic.
> I don't know how to replace this line
> echo "level ${LEVEL}" > /proc/acpi/ibm/brightness
>
> I have a file
> /proc/acpi/video/C14B/C160/brightness
> whose contents look like
> levels: 100 51 30 37 44 51 58 65 72 79 86 93 100
> current: 72
>
> I did some echoes to that file, but no luck so far :(
>
