Acer Laptop Bightness and Volume Hotkeys not working!

[Mike C.]

On 07/03/13 01:30, Mike C. wrote:
> On 06/23/13 23:57, CeDeROM wrote:
>> Hey :-) For my Dell laptop the backlight is controlled by hardware,
>> unlike sound keys where you can assign them to use
>> xf86audiovolumeup/down (or similar) to interact with mixer. I would
>> search for automatic backlight hothey that would block manual control,
>> or BIOS settings (like automatic backlight) or maybe new BIOS would
>> fix that problem..?
>> Best regards,
>> Tomek
>>
>> --
>> CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
>>
> I don't hae any BIOS settings for this... I have the most recent version
> of my bios but this Ultrabooks don't really have many options :)
>

I tried the xbrightness port, but no luck however I don't really
understand the error:

xbrightness 1.0                                                            
xbrightness:  unable to open default display.


Could this be related to the fact that I've built Xorg with:
WITH_NEW_XORG=true
WITH_KMS=true

Thanks!