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shlape
n00b
Joined: 04 Feb 2005
Posts: 29
Location: Cranny, Aus.
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 Posted: Thu Apr 02, 2009 11:53 pm Post subject: [SOLVED] LCD brightness buttons don't work. |
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Having installed Gentoo 2008.0 on my new Vostro 1710 I noticed the brightness controls don't work as they did on my old Latitude D800 laptop. Before hassling Dell about the possibility that there was a problem with the laptop itself, I booted an Ubuntu live CD and found it worked perfectly.
Before anyone diverts this topic to "why don't you just install Ubuntu", I'll mention briefly that I think Ubuntu is a great Linux distro but my preference is Gentoo.
I believe the problem may be an incorrect kernel configuration. Any ideas?
Last edited by shlape on Sat Apr 04, 2009 12:28 am; edited 2 times in total |
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avieth
Veteran
Joined: 17 Sep 2004
Posts: 1945
Location: Canada
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| Posted: Fri Apr 03, 2009 1:54 am Post subject: Re: LCD brightness buttons don't work. |
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| shlape wrote: | | Before anyone diverts this topic to "why don't you just install Ubuntu" |
 That would never happen here!
I googled and found this page. There's some good information on there that you can try on your system, like the echo -n # /proc/acpi/video/VGA/LCD/brightness . Half way down there are a couple scripts that are offered up to replace some apparently useless acpi files, you should try that. |
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shlape
n00b
Joined: 04 Feb 2005
Posts: 29
Location: Cranny, Aus.
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| Posted: Fri Apr 03, 2009 3:10 am Post subject: Re: LCD brightness buttons don't work. |
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| avieth wrote: |
I googled and found this page. There's some good information on there that you can try on your system, like the echo -n # /proc/acpi/video/VGA/LCD/brightness . Half way down there are a couple scripts that are offered up to replace some apparently useless acpi files, you should try that. |
Yeah, Google gave me results like that too. UnfortunatelyI have no "video" in my /proc/acpi directory.
The thing that has me believing it may be a kernel config problem is, after booting the Ubuntu live CD, I can see a /proc/acpi/video/...
While in Ubuntu, I copied the lsmod output to see what modules *may* be added, but instead of mindlessly adding modules which I'm not sure of, I'm hoping someone can direct me down a wiser path.
...or maybe I'm off in the wrong direction?
*help*
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shlape
n00b
Joined: 04 Feb 2005
Posts: 29
Location: Cranny, Aus.
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| Posted: Fri Apr 03, 2009 8:04 pm Post subject: How did he do it??? |
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I guess it's always useful to provide a 'how did I do it' after marking the post as SOLVED, so here it goes....
After finding out that the Ubuntu live CD was succeeding in configuring the laptop to use the brightness keys I thought I'd have a look at the .config it was using.
I found that CONFIG_ACPI_VIDEO was set, but in my kernel config it was no where to be found. Instead of doing a nasty cut-n-past to my .config file
I looked around and found this:
http://www.nabble.com/T61-Brightness-keys-with-2.6.26-not-working-(NVIDIA)-td18577619.html"
(sorry, the URL function just wasn't working for me this morning) 
More importantly...
| Quote: | In 2.6.26 the dependencies for video.c changed. please make sure you have
CONFIG_ACPI_VIDEO enabled (i think it requires CONFIG_VIDEO_OUTPUT_CONTROL
now). |
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| Quote: | Previously I could not enable CONFIG_ACPI_VIDEO because it wasn't displayed in
menuconfig. After I enabled CONFIG_VIDEO_OUTPUT_CONTROL I finally could select it. |
After doing this, and a quick reboot... problem solved. |
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pilla
Bodhisattva
Joined: 07 Aug 2002
Posts: 7731
Location: Underworld
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| Posted: Sun Apr 05, 2009 2:10 am Post subject: |
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Moved from Installing Gentoo to Kernel & Hardware.
_________________
"I'm just very selective about the reality I choose to accept." -- Calvin |
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durand101
n00b
Joined: 11 Nov 2007
Posts: 24
Location: Nottingham, UK
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| Posted: Thu Jul 23, 2009 10:36 pm Post subject: |
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| shlape, thanks for posting the solution! |
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piponazo
Tux's lil' helper
Joined: 09 Feb 2008
Posts: 102
Location: Córdoba - Spain
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| Posted: Wed Jul 29, 2009 11:49 pm Post subject: |
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My eyes will be grateful to you forever  . This solution works.
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La plaga tux!  |
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Kernel & Hardware
