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Screen brightness not working

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http://askubuntu.com – I use Ubuntu 12.04 on my Sony Vaio(VPCCW2HGX). At the first times, brightness control works well, but after the activating additional drivers(nvidia accelerated graphics driver) brightness control doesn't work. I searched this issue on so many Ubuntu and Linux forums, but solutions doesn't work. I tried these ways: Installing xbacklight, Adding Option "RegistryDwords" "EnableBrightnessControl=1" to /etc/X11/xorg.conf Updating Nvidia drivers To try to change brightness by typing "sudo setpci -s 00:02.0 F4.B=xx" All of these ways doesn't work. I still can't set screen brightness. Is there an (HowTos)

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Submitted by funckax on 07/11/2012

Stories similar to Screen brightness not working

Hello,

Hello,

I'm using a Sony VAIO with Fedora 18. My graphics driver is AMD Radeo HD7650M 2GB.

Problem: I'm unable to decrease the brightness level, which is running at its maximum setting.

What all I tried:

1. I first tried to fix the problem by trying these one by one and then in combination. a. Changing the value in /sys/class/backlight/acpi_video0/brightness b.

Hello everybody,I have a Vaio S13 laptop with a Nvidia 310M graphics card. For some time now I have been having a recurring problem with the brightness controls.

Hello everybody,

My laptop is a Sony Vaio S13 laptop with a Nvidia 310M graphics card. Ever since I installed Ubuntu on it (11.10, now running 12.04) I have been having a recurring problem with the brightness controls.

I am using Sony Vaio VPCCW15FN/R model..I am running Live Ubuntu 12.10 using USB.The problem I am facing is that after booting, in Ubuntu i am unable control brightness.I can control volume using Fn key shortcut but not brightness..i got to know that its Nvidia Graphics card issue..Due to extreme brightness, I am getting lots of stretch on my eyes..Please help ASAP..Thanks in advance.!

I installed ubuntu 12.04 on my laptop for first time and every thing work well but the only thing doesn't work is the brightness doesn't change when i press F5 and F6 with Fn

So i can't adjust the Brightness and sometimes i need to decrease it for more time working on battery

and the bubble appear that it changed but nothing happen

my laptop is Sony VAIO series F with NVIDIA GEFORCE ...

and

Hardware: 13" MacBook Pro 5,5 (Summer 2009), GeForce 9400M.

OS: Ubuntu 12.04.2 AMD64

My hardware and OS are similar to what some others with this problem had, but what worked for them doesn't work for me.

Unfortunately, with the nvidia driver, the brightness controls (F1 and F2) do not work - no feedback at all.

Lenovo Y500 can't set brightness 25 weeks 13 hours ago

I've installed Ubuntu on a Lenovo Y500 laptop (2012), video card is Nvidia 650M (no integrated graphics), I'm using driver 310.19. The problem is that I can't adjust brightness at all.

I installed Ubuntu 12.10 on a Sony vpc cw18gf.

I can not decrease or increase brightness and my Fn key does not work.

My brightness and lock settings are as in this image:

I tried both pages below but my problem is not solved.

page 1: Brightness control doesn't seem to work on a Toshiba Satellite M115 laptop

page 2: Ubuntu 12.04 - Brightness controls not working [duplicate]