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Adjusting Screen brightness

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On the Xfce Desktop   PANEL" there an Option to Add a BRIGHTNESS PLUGIN . It works as expected except the SLIDER does not change the brightness. There are Brightness Function Keys on the keyboard that can move the slider display but have no effect on brightness .

Has anyone had the same problem or it would be useful to know if you can control the brightness on yours OK.

My PC is a Samsung NC 110 Netbook with an Integrated Intel Video Chip


A quick Google of "xubuntu 14.04 brightness" shows this is clearly an issue.

This link looks promising.



Results from Googling "xubuntu 14.04 brightness"


If you get it fixed write back and let us know what worked.  ~Scott

This is just one of many remedies needed throughout the decades to cope with hardware vendor pranks. Maybe it will suggest a productive direction of inquiry.

Hi Scott
Thanks for the ideas . had looked at   http://itsfoss.com/fix-brightness-ubuntu-1310/
but its a Command solution and fails to respond at the Terminal stage for me . That opens a new can of worms for me for me to sort.

That was why I was looking for someone who had experience of using the Brightness Control . Does it work OK for them or not and  have they found a working solution for  Lite .


Hi Scott
As you say its a old Problem .

I understand the developers time is limited and this problem may not be considered important and so does not get fixed . The downside it leads to a lot of frustrated users wasting time and effort trying to fix it themselves .
 This can have a negative impact on the take up of Ubutu and its derivatives because they are deemed not fit for purpose for the non tech user who wants it to work out of the box  .

I found this --- but Lite does not have Gedit installed .  Should I be able to use the "Simple Text Editor " ad how do I get the equivalent of( sudo gedit /etc/default/grub)

Well my friends have been facing brightness problem in Ubuntu 12.04 Precise Pangolin. And every one were facing and asking me to help me out with it. So, I viewed all over the Internet and helped them out. I helped with it myself too in Dell XPS 13. And for friends Acer Aspire, HP Pavilion DV6. So it might work on most of all the PCs.

My friends were just trying the xrand solution that just decreases the Contrast which had no effect on the power consumption. So, this solution was the most to be kept. I am feeling quite when the Fn(Function key) and the Brightness Up and Down are working great. You can follow up the procedure that I have kept in an easy steps.

Open terminal ( Ctrl+Alt+T ) and type:

sudo gedit /etc/default/grub

You will find this line in the new opened window:

Change it to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
Save and close the window and type this in the terminal:

sudo update-grub

This will update your grub and while rebooting your PC, it will set an extra parameter on the grub menu during boot. This problem might have occur on due to the upgrade on kernel.

Enjoy the power saving system.


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