max PWM is zero

[Marcos Paulo de Souza]

Hi Keith,

On Sat, 19 Nov 2011, Keith Packard wrote:

> On Sat, 19 Nov 2011 11:26:07 +0000 (Local time zone must be set--see zic manual page), Marcos Paulo de Souza <marcos.mage at gmail.com> wrote:
>> So, anybody gets the same message?
>>
>> I'm trying the 3.2-rc2 and it gives the same message.
>>
>> Again, if you need someone to make tests, or test some patches, I'm
>> able to do this.
>
> Is your machine even using the intel backlight device? You can test this
> by:
>
> # cd /sys/class/backlight/intel_backlight
>
> Then look at 'max_brightness' and try echoing a range of numbers from 0
> to max_brightness into the brightness file and see if it changes the
> backlight.
My max_brightness is 1, and my brightness is 0. But, my acpi_video0 have a 
max_brightness value = 9...
> It's more than possible that your machine is simply using some other
> hardware to drive the backlight and that the integrated backlight
> controller is simply disabled.
So, what can I do to silence this warning...? Change the driver of 
backlight?
> -- 
> keith.packard at intel.com
>