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[ubuntu] Unable to Adjust Screen Brightness 12.10

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http://ubuntuforums.org – Hello! I have just installed Ubuntu 12.10 on my Acer Aspire One 725 but I cannot seem to adjust my screen brightness and it is stuck on maxmimum draining my battery quickly. I have searched through every thread but nothing seems to work for my specific laptop. I have tried editing my Code: /etc/default/grub as tried in many other threads but it has not worked for me. I might also add that I have tried using both Fn + L and R arrow keys, as well as going to the system settings and adjusting the screen brightness (although after I messed with the /etc/default/grub the brightness slider ha (Hardware)

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Submitted by xskl on 10/29/2012

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I have an Acer Aspire one 5742 laptop. I installed Linux Ubuntu 12.10 on it. I have one problem with it. no matter how I press the Fn+ up or Fn + down keys I cannot adjust the Screen Brightness. It is at its maximum brightness and this drains the laptop battery. I did some googling and found out that you needed to change some settings in the grub file but I don't know exactly what to do.

I'm currently using a LG laptop with Nvidia Cuda GeForce GT 335M.

I have difficulty adjusting the screen brightness using FN+Arrow Up/Arrow Down. The brightness indicator will appear and the bar will not decrease beyond the first jump.

Can't adjust brightness on Acer Aspire 5738 running Karmic. The same happened under Jaunty. The screen never seems to reach its full brightness and it flickers.

I have a gateway m-series laptop, and I just recently installed ubuntu 9.04 (x64) in attempts to broadening my OS use. For the most part this is working great, but my current issue is with my screen brightness. When attempting to adjust the brightness either through ubuntu or on my keyboard(fn+up or down) ubuntu shows that I am adjusting the brightness but there is no actual change.

Definitely a laptop problem, hopefully not a hardware problem.

When I try to adjust my laptops screen brightness, it goes to some very low brightness and then the screen starts flickering (ie changing between different brightness levels). When my laptop boots, it's at full brightness, and when I adjust that, flickering starts. After that I cannot get it back to any non-very-low brightness.

Can't Adjust Screen Brightness 36 weeks 3 days ago

I tried using Fn+<- to turn the brightness down, and it showed the little sun icon indicating the brightness was turning down, but it didn't do anything. I also tried xbacklight -set 100 but that didn't do anything either.

How can I adjust my backlight?

I'm not able to adjust brightness on my laptop, neither from the GUI tool nor via my laptop's built in FN keys. The prompt for brightness does come up, and the slider moves, but it has no effect and my laptop remains stuck on the highest brightness settings possible.

How do I fix this?

Hi

I have just installed xubuntu on my laptop and I am unable to adjust the brightness of the screen....at the moment it is very bright!!!

The laptop is an Acer 5755G core i7 nvidia gt540m

The function keys (FN+arrows) bring up the image of the sun and the slider moves, but the screen brightness doesn't actually change.

I recently installed Ubuntu 9.04 (x64) on my gateway m-series laptop. Works great minus the fact that I can adjust the screen brightness. when using an applet or my keyboard, ubuntu shows that it is being adjusted, but the actually screen brightness is constant(100%). Besides the fact that it is killing my battery, my eyes dont really adjust well to it.