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How to change brightness on CRT display through the Linux command line?

I have a Debian Linux desktop and a CRT display. I want to change the screen's brightness without using the monitor's brightness controls. How can I do this? Is this possible in the command line or is there an application to be installed?

How to disable automatic brightness setting on LG monitors?

I have two LG monitors (both 23MB35PM) which have an annoying and distracting feature of automatically changing their brightness at random times, probably due to some power saving mechanism.

How can I switch it off?

Brightness settings gone, how do I bring it back?

I have a VAIO CW laptop with Windows 7 x64, and after installing new NVIDIA drivers, my screen brightness controls are no longer available. (Not in the control center, not in the power options, buttons don't work even though VAIO's brightness adjust window pops up, etc.).

My display doesn't dim either.

It works fine on other OSes (e.g. Windows 8).

I've tried uninstalling and reinstalling a bunch of drivers (even tried installing the factory-default NVIDIA driver) and software (including the VAIO event service), but it doesn't work.

Any idea how to fix this?

How to change to brightness of an external display on a macbook pro running OSX 10.6

I am using a macbook pro running OSX 10.6 snow leopard.

In System Preferences/Displays/Display, I can change the brightness of the macbook's screen. However, this option is not available for the external monitor.

Is there a way to change the brightness of an external monitor without resorting to changing the settings manually on the monitor itself ?

This happens using both of the mini-displayports adapters (DVI & VGA)

Laptop monitor brightness changes depending on image displayed

I have a windows 8 laptop. My desktop background is very dark (almost black) and when i have no windows open, my brightness dims. When i open an application that is primarily white (google chrome's start page) or just a white image, the screen brightens. It seems to be caused by the color of the screen. If i open http://www.fanhow.com/images/1/10/Green_Storm_Fill_Black_Color.jpg and zoom in and out, when the black image is small, the screen brightens, when it gets bigger, the screen darkens.

I have most likely ruled out "Adaptive Brightness" because I do not have an ambient light sensor.

Is this a feature?

How to prevent laptop screen brightness from changing when un/plugging battery power

When I am using my laptop, I continually adjust the screen's brightness based on the lighting conditions in the room (e.g. how much light is coming in from windows, etc.). But if I unplug the laptop or plug it back in, Windows looks at the default brightness setting in the power profile for "on battery" or "plugged in" and changes the brightness accordingly. This is a jarring experience and then I have to hunt down the ideal brightness for my current situation again, rather than getting on with my work.

I would like to make it so that plugging or unplugging the battery is not a trigger that adjusts the screen brightness at all. The screen brightness should only change when I adjust it myself. Does anybody know how this might be accomplished?

Edit: I have encountered this issue in both Windows Vista and Windows 7.

How can I find a light sensor to adapt my monitor's brightness to the room?

Where can I find a standalone light sensor that updates the brightness of my screen to match the ambient light level in realtime for Windows 7? My monitor does not have a sensor. I had the idea there was such a thing, but all I can find is for laptops or Macs.

Adjusting laptop display brightness doesn't work in Linux Mint 14

I recently installed Linux Mint 14 on my Samsung R580 laptop. The Fn-keys worked out of the box, I can switch screens, adjust volume and so on.

When I try to adjust the brightness (Fn + ↑/↓), the slider shows up and moves to the left and right, but screen brightness does not change at all, it always stays at 100%.

I tried to change the brightness in the system settings and it also doesn't do anything.

When I'm inactive for 5-10 minutes, the energy saving profile kicks in and the screen is dimmed. So the dimming does work, but not when I change it manually.

I found some threads stating that you should change the acpi_background setting to "vendor" in Grub config, but that didn't change anything for me.

What else can I try?

Is there a way to adjust colors of a specific window?

Is there a (Windows) program or something that will allow the user to adjust the brightness/contrast/gamma of a specific window rather than the whole screen?

As a use-case scenario, imagine having a web-page showing on one half of the screen, and another program taking up the rest of the screen. This other program uses the default Windows colors (e.g., white background), so it may be glaringly bright. Alternately, the web-page may be too dark to see. Adjusting the monitor or video-card settings would affect everything which will be no good. Adjusting the default Windows colors is, at best, inconvenient. Instead, there needs to be a way to set the colors of one of the windows to equalize the whole screen.

Windows 8 Fn key doesn't work for brightness

I have an Asus laptop with Windows 8 and clicking Fn+F5 / Fn+F6 keys (for brightness) doesn't work. In fact, they work, but they can increase/decrease the brightness only one time. What I mean is that after pressing Fn+F5 once, nothing happens if I try to press Fn+F5 again, before I press Fn+F6.

This only happens after logging in. At the login screen and during Windows boot I can adjust the brightness as I want, but after login I can't.

I installed the latest ATK driver and NVIDIA graphics driver for Windows 8, and I think that my problem is related to conflict with drivers. I tried to reinstall/delete some drivers, but it didn't help.
How can I detect where is the problem?

Windows 8 on ASUS notebook, Brightness Down does not work

Recently my brother installed Windows 8 on his ASUS notebook. He had problems with the FN keys, so he asked me to have a look at it.

I've installed the ATK Package from ASUS found in this other question. This package fixed the problems I had with my own notebook, so I thought it would work for my brother too. However, on his notebook there is still one hotkey that does not work: brightness down (FN+F5).

Whenever that hotkey is pressed, it will only turn the brightness down one step, and after that all hotkeys suddenly stop working. It seems like the entire hotkey driver freezes. After a while (30s to 2m) the on-screen notification from the brightness change suddenly pops back up, and everything seems to work fine again. That is of course until I press FN+F5 again. Strangely, brightness up (FN+F6) works just fine.

I already tried reinstalling both ATK drivers and NVIDIA video drivers, but that did not solve it. I've googled around, and found at least 3 other forums with multiple people experiencing the same problem, with no solution either.

Since I couldn't find anything related on superuser, I'm asking it here. Do you guys have any suggestions on how to solve this problem?

Backlight control in Eee PC 1015PEM

When I boot my Linux with acpi_osi=Linux, I can control backlight brightness from almost_zero to moderately_bright. (Actually, the maximum revolves around the brightness level that is set before Linux starts)

When I boot my Linux with acpi_osi=Linux acpi_backlight=vendor, I can control brigtness from middle to maximum_bright

How to be able to control it from almost_zero to maximum_bright?

                 very_dim:   dim:   normal:  bright:  very_bright:
acpi_backlight:                          *************************
only acpi_osi:   ***************************
I want:          *************************************************

Can I fine-tune my screen brightness keys? (Ubuntu Studio, Thinkpad T420s)

I am in a similar situation as question Can I fine-tune my screen brightness? . For me, Thinkpad T420s and Ubuntu Studio 11.10. The brightness keys work fine but the increments are too large. I have the /sys/class/backlight/acpi_video0 and I can see the value of actual_brightness changing as I use the brightness keys - it changes between values 0,3,6,9,12,15.

None of the listed answers for fine control works here, as follows:

• As the root user I can echo integers to brightness in the above folder. As an ordinary user I cannot.
• I do not have /usr/sbin/gnome-power-backlight-helper (because I'm using xfce perhaps?), and not sure what package it's from or if installing such a package would make sense since it's not what's currently managing the backlight.

EDIT: In an answer below, I describe a command-line way to do it. However, I'd like the brightness keys on my keyboard to do smaller steps. I don't know what component handles those keys (I'm in Xfce BTW). Which component is handling it, and how can I configure it to use finer steps please?

Can I fine-tune my screen brightness?

My laptop is Lenovo T400, and my OS is Ubuntu 10.10. I change the brightness of my screen by pressing the FN key and one of the two keys for increasing/decreasing brightness.

The brightness I feel comfortable is between two consecutive levels that are offered. So I wonder if it is possible to fine-tune the screen's brightness?

Are TFTs intended for brightly lit enviroments only? [closed]

I recently bought a 22" (LG) TFT to replace my old 17" CRT monitor. The very first thing I noticed was how bright it was. I reduced the brightness from 100 to just 20 and toned down the gammma and contrast. Then I opened my videocard settings and reduced the brightness there as well. I used this screen for a few days in a dimply-lit environment and my eyes are really sore. I had no problem with the CRT in that same spot.

Are these things supposed to run in bright environments only or are my eyes just sensitive?