Brightness Control

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ahimmerman
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Brightness Control

Postby ahimmerman » Sun Jul 01, 2012 3:13 am

Hello,

I'm running Linux Mint 13 stock with Cinnamon on a Lenovo ThinkPad W520 4276-39U laptop with an NVIDIA Quadro M1000 GF108GL (NVIDIA driver version 295.40). The Fn+Home and Fn+End (LED brightness increase and decrease, respectively), works when in consoles; however, in Cinnamon, they don't. When those keys are clicked, the brightness slider pops up and indicates changes, though brightness doesn't change. Also, the software brightness control, under Cinnamon Settings: Brightness and Lock, also has no effect.

Not sure if it's relevant, though, while trying to work through the issue, I switched the kernel from acpi_backlight=vendor (implicit default) to acpi_backlight=thinkpad_acpi. When operating under that driver, Fn+Home and Fn+End poped the brightness slider up, yet no change was indicated (and no change occurred). Also, under that driver, unhandled HKEY events were sent to syslog. Since then, I've restored the default configuration.

Any assistance would be appreciated.

Andrew

okko7
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Re: Brightness Control

Postby okko7 » Wed Jul 04, 2012 7:40 am

Try the following: 

Code: Select all

sudo nvidia-xconfig
(if there is no xorg.conf file yet)

Then

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sudo gedit /etc/X11/xorg.conf


Under "Section "Screen", before "EndSection" add:

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Option  "RegistryDwords" "EnableBrightnessControl=1"


So that section would look something like this (yours might not be exactly the same) -

Code: Select all

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24
    EndSubSection
    Option      "RegistryDwords" "EnableBrightnessControl=1"
EndSection


Then reboot.

sharat87
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Re: Brightness Control

Postby sharat87 » Wed Jul 11, 2012 12:42 pm

Hi okko7,

I am facing this same problem but I don't have an nvidia card. I also don't have an `xorg.conf` file. Can you tell me how I can create it or otherwise get the brightness controls working?

Thank you.

AmneetBedi
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Re: Brightness Control

Postby AmneetBedi » Tue Jul 17, 2012 2:10 pm

Facing the same problem on Acer Aspire 5749 running Linux Mint 13 cinnamon. Tried modifying xorg.conf file as suggested above, but the issue still persists.

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lunatico
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Re: Brightness Control

Postby lunatico » Tue Jul 24, 2012 7:44 am

Running Linux Mint 13 Cinnamon 32-bit on a Thinkpad W520. I was also having this problem and the suggestion from okko7 did fix it for me.

Thanks!

Lebrontron
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Re: Brightness Control

Postby Lebrontron » Wed Jul 25, 2012 11:12 am

I did this on my Lenovo z570 with a onboard intel graphics card. After restarting i got a prompt that X server has stopped working. Then on the command line i renamed the xorg.conf file i created to xorg.conf.failsafe and i could reboot the system into cinnamon. What's the right way please suggest.

baliiii
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Re: Brightness Control

Postby baliiii » Mon Aug 06, 2012 5:54 am

@okko7
Thanks mate.

jvb
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Re: Brightness Control

Postby jvb » Wed Aug 22, 2012 8:29 pm

@okko7 works for me too.

I had recently (19th August 2012) installed the latest graphics driver from NVIDIA (file:///home/jvb/downloads/installed/NVIDIA-Linux-x86_64-304.37.run) and lost the use of the brightness keys too, probably due to overwriting xconf.org in the NVIDIA driver installatiion.

x64 Linux Mint Debian Edition

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Xethron
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Re: Brightness Control

Postby Xethron » Sun Oct 21, 2012 1:09 pm

@okko7 Thanks! This works great! Bookmarked!
Image

muzule
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Re: Brightness Control

Postby muzule » Tue Jul 01, 2014 3:42 pm

works for me too mate! and I had to dig deep!
I've a W510 with Mint 17.
Thank you so much!

obscenic
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Re: Brightness Control

Postby obscenic » Sun Nov 02, 2014 12:45 pm

This also worked for me (Lenovo T510) on Mint 17 too. Thank you!


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