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Old 12-25-2007, 04:48 PM   #1
YodaSlack
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Brightness control on laptops.


Hi to all.

Could you give me the start point for this problem.
I mean I have got hp pavilion dv6630er laptop. Everything is fine but the brightness control of my monitor does not work.
I supposed that there is some acpi function to make it works but I know nothing about this.

Thanks.
 
Old 12-25-2007, 04:53 PM   #2
Junior Hacker
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Many laptops have 2 brightness settings in the bios, one for AC powered and one for battery powered. This is setup through "setup" or similar before the operating system boots up.
 
Old 12-26-2007, 11:02 PM   #3
YodaSlack
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Thanks,

But I think that is not good solution. I know that britness controll works fine under Windows and can't get it uder Linux.
 
Old 12-27-2007, 08:55 AM   #4
dracolich
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What are you using to change brightness under Windows and Linux? I have an old Pavilion ze4315 and I've always used the Fn key with the F1 and F2 keys to change brightness. I believe all laptops have something similar designated by symbols printed on the keys and it should be controlled by the hardware and not the os.
 
Old 12-27-2007, 10:30 AM   #5
Alien_Hominid
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It is controlled by special drivers, which you installed when installing windows. Those drivers probably access acpi/apm and consequently manages your screen brightness. What does happen if you follow dracolich advice?
 
Old 01-24-2008, 02:16 PM   #6
YodaSlack
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It seems that my English not so well. "dracolich advice" What does it means?
I understood that there is some acpi or apm interface to control brightness. And I want to know which one. But it seems that it is not possible.
 
Old 01-24-2008, 02:38 PM   #7
dracolich
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My Pavilion laptop, for example, has symbols on the F1 and F2 keys that look like stars. If I hold the Fn button and press F1 repeatedly the screen gets brighter. Fn + F2 makes it darker. This function is controlled by the BIOS. I don't use graphic utilities for power management. There may be KDE or GNOME tools to change brightness using acpi but I've never checked.
 
Old 01-24-2008, 02:56 PM   #8
Uncle_Theodore
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Quote:
Originally Posted by YodaSlack View Post
It seems that my English not so well. "dracolich advice" What does it means?
I understood that there is some acpi or apm interface to control brightness. And I want to know which one. But it seems that it is not possible.
Have you tried modprobing "video.ko"? You might wanna look here
http://brightlcd.blogspot.com/2007/1...as-bright.html

PS
"dracolich advice" means the advice given by user dracolich, I suppose.
 
  


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