Brightness controls not working on a Sony Vaio VPCEH38FN

Question

I have ubuntu 12.04 installed on windows 7. When I use the Fn alongside the key to reduce brightness, or even using the system settings, I am not being able to reduce the screen brightness. What is the problem?

@JorgeCastro it is sony vaio VPCEH38FN, but i dont know how it shud help — , Jun 18 '12 at 13:10
possible duplicate of Brightness doesn't change on Sony laptop — belacqua, Nov 03 '12 at 22:36

score 3 · Answer 1 · edited Oct 05 '12 at 22:51

3

Run:

sudo gedit /etc/default/grub

Update these lines:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

... with the following arguments:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
GRUB_CMDLINE_LINUX="acpi_osi=Linux"

Then run sudo update-grub and reboot.

edited Oct 05 '12 at 22:51

Eliran Malka

1,205
18
36

answered Jun 10 '12 at 12:35

Zumy

31

1

hey..this is not working for me..Instead my Fn key has completely stoppd working, first it showed the brightness bar, but the brightness just didnt reduce..Now, it is not even showing the brightness level when I press the Fn key alongside key to reduce brigtness. – Jun 11 '12 at 05:41
1

It worked on my system with the 2 modifications on one line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor" – To Do Dec 13 '12 at 14:45

score 1 · Answer 2 · edited Aug 06 '12 at 03:57

1

I have a SONY VPCEG Vaio and to manipulate brightness in Ubuntu. Based on a article that I lost, I use this:

https://github.com/ricardodani/sony-vpc-brightness-linux/blob/master/bright.py

edited Aug 06 '12 at 03:57

Eliah Kagan

117,780

answered Aug 06 '12 at 02:30

Ricardo

111

score 1 · Answer 3 · edited Jul 30 '13 at 14:55

Here's how i fixed mine :

LCD Brightness Control

Once you have installed the proprietary Nvidia drivers as suggested above, you may notice that your brightness control keys do not work properly. This is fixable by editing one's xorg.conf file. Open a terminal window and type the following:

sudo nano /etc/X11/xorg.conf

This will open your X server configuration (after prompting for your password). You should see a section titled "Device" that looks as follows:

Section "Device"
        Identifier      "Default Device"
        Driver  "nvidia"
        Option  "NoLogo"        "True"
EndSection

Append a line so it appears like this:

Section "Device"
        Identifier      "Default Device"
        Driver  "nvidia"
        Option  "NoLogo"        "True"
        Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection

You will need to restart your graphical server (or reboot) for this change to take effect.

score 0 · Answer 4 · edited Aug 06 '12 at 04:00

0

I had the same problem and I solved it as follows.

This page shows how to set up the 3D cube and I am enclosing it because I used the same tool: CompizConfig Settings Manager.

That page tells you what to install and how to do it. Once it's installed, open CompizConfig Settings Manager, go to Accessibility > Opacity. Click on the Brightness and Saturation/*Brightness* tab.

Enable "Increase and Decrease Brightness" and set the key combination for it. Be careful. CompizConfig Settings Manager is a very powerful tool and if you don't know what you are doing, you may damage your Ubuntu system.

I would have posted screenshots but it is prohibited to new users. It is fairly simply though.

edited Aug 06 '12 at 04:00

Eliah Kagan

117,780

answered Jun 16 '12 at 14:34

christos

1

Can you post the screenshots elsewhere and link here...so someone eventually come and modify this post to include it in your answer – deostroll Jun 17 '12 at 17:12
hey christos, this is not working for me..i did exactly wt u said, but nothing is happening.. – Jun 18 '12 at 13:05
@christos If you post a comment with link(s) to screenshot(s), and you ping me in the comment (by including the string @EliahKagan), I'll put them in this answer for you. – Eliah Kagan Aug 06 '12 at 04:01

deostroll · Answer 5 · 2012-06-19T14:49:33.980

0

There is an app for it...Brightness And Lock

enter image description here

edited Jun 19 '12 at 14:49

answered Jun 19 '12 at 14:31

deostroll

1,769

but u dont have the option to reduce or increase the brightness in this app.. – Jun 19 '12 at 14:44
I've edited the answer with a pic...you can see the brightness slider... – deostroll Jun 19 '12 at 14:52
is this in 12.04, cause i am not being able to see one... – Jun 19 '12 at 14:53
post the screenshot of your system settings on some image service like imgur...post that link here – deostroll Jun 19 '12 at 14:56
OK. Hold on deostroll. – Jun 19 '12 at 15:04
http://imgur.com/Pt9K2. Here it is – Jun 19 '12 at 15:05
May be you should update your post citing this difference...and regtag your post with 12.04, driver and support. Mention is a sony and publish its configuration out here. – deostroll Jun 19 '12 at 16:13

score 0 · Answer 6 · answered Sep 13 '12 at 12:19

0

I have a SONY Vaio E15 ( E15113 ) and was able to solve the problem using the solution mentioned in an earlier post

https://github.com/ricardodani/sony-vpc-brightness-linux/blob/master/bright.py

answered Sep 13 '12 at 12:19

user89349

1

2

While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. – Peachy Sep 13 '12 at 17:07

Brightness controls not working on a Sony Vaio VPCEH38FN

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