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brightness control doesn't seem to work

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http://askubuntu.com – I have Ubuntu 12.04 LTS on a Toshiba Satellite M115 laptop. The brightness control doesn't seem to work with the "brightness and lock" setting or fn f6 and fn f7 (which usually works in Windows). How can I adjust the brightness and/or access different power settings, so my computer isn't running on full power all the time? (HowTos)

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Submitted by Danial on 11/07/2012 – Made popular on 11/07/2012

Stories similar to brightness control doesn't seem to work

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]

Can't adjust brightness 36 weeks 3 days ago

I have a Toshiba Satellite A105-4244 (Intel Chipset+Integrated Graphics) and I can't adjust the brightness. Neither the buttons nor the system settings/brightness and lock work.

Also I tried the grub suggestions acpi_backlight and it didn't solve anything.

Brightness control via System Settings->Power Management doesn't work anymore when I install the NVIDIA proprietary driver, it does work with the 'nv' driver. I have a tool nvclock that I can use to control the brightness, can this be integrated into the Power Management tool? Another problem is that the Fn+BrightnessUp and Fn+BrightnessDown buttons don't work.

When I use the brightness changing buttons Unity changes the brightness by two levels each time to create a nice effect. However, I only have about 10 different brightness settings and so this effect has caused a reduction in brightness settings to 5.

After a fresh Ubuntu install on my laptop, I discovered the function keys for screen brightness control (Fn+F4 and Fn+F5) are not working.

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.

[ubuntu] brightness level. 24 weeks 2 days ago

ok, this is no big deal, but it is slightly annoying.

whenever I boot into ubuntu the brightness level is set really low.

Hi!

I have a Toshiba R830 laptop. The problem I have is that the screen brightness controller stops work after I resume the computer from sleep mode. If I do a complete reboot - I can change the screen brightness. It works if I wake it up from hibernate too.

Brightness of my Laptop LCD 2 years 40 weeks ago

Hi everyone, when I start my computer it starts with max brightness, I don't like it. So in rc.local I put

Quote:

echo -n 25 >/proc/acpi/video/GFX0/LCDD/brightness

It work fine for run-level 3, but when I startx the brightness go to max again. Can I control/save brightness for X.

I use slackware64 13.1 with a Ati graphic card.