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Questions tagged [brightness]

Questions related to screen brightness.

1686 questions
224
votes
18 answers

How to change LCD brightness from command line (or via script)?

To work around bug #1005495 (changing LCD brightness via hotkeys impossible), I'd like to have one command line query for increasing and one for reducing the brightness of my LCD. I could then map a hotkey to each one of this queries. The problem…
user69748
  • 2,453
155
votes
20 answers

Brightness is reset to maximum on every restart

The brightness of my laptop is reset to max on every restart. I tried the solution provided at this website but had no luck. This command cat /sys/class/backlight/acpi_video0/max_brightness Returns cat:…
b-ak
  • 4,420
130
votes
2 answers

What is the difference between GRUB_CMDLINE_LINUX and GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub

I'm troubleshooting a fn-key brightness control problem on my laptop, so I'm wading through a lot of config options in /etc/default/grub, as you can imagine. However, it's raised a question for me: What's the difference between the lines marked…
analogyschema
  • 1,411
94
votes
14 answers

Changing the screen brightness of the external screen

I have installed Ubuntu 16.04 LTS on my laptop and connected it to an external monitor via an HDMI cable. I can easily change the brightness of the laptop screen but that does not affect the brightness of the external monitor. Is there any way to…
Ad Infinitum
  • 1,129
69
votes
11 answers

Cannot change brightness (Ubuntu 16.04 LTS, Unity)

I'm new to Linux systems in general (I'm using Ubuntu 16.04 LTS) and I'm having difficulty in changing the brightness of my notebook. When I use the Fn+F8 or Fn+F9 the brightness bar shows up but there is no change in the actual brightness of the…
Andrei
  • 793
58
votes
11 answers

Desktop doesn't remember brightness settings after a reboot

Every time I reboot my machine the brightness goes back to 100% in Gnome. I wish it would keep the last setting. Is there anyway?
Decio Lira
  • 8,154
56
votes
10 answers

Is there a software utility to adjust screen gamma/brightness/contrast?

I use to work at night and it is eye-hurting to watch at lightbulb-bright screens (I've got two - laptop's built-in panel and an external 18-inch CRT) in a dark environment. So I adjust my screens to be darker. Can I do this a software way instead…
Ivan
  • 58,745
49
votes
16 answers

Unable to change brightness in a Lenovo laptop

Brightness adjustment keys have no effect (although they are recognized by the environment), and I can't change the brightness using GUI tools as well. This seems like a problem in Linux itself, not the desktop environment. I can change…
Oleh Prypin
  • 2,595
49
votes
10 answers

Decrease Backlight Below Minimum

I have this laptop that doesn't handle the backlight very well. In /etc/default/grub, I have added a acpi_backlight=vendor function to get it to work at all. Which is cool, and the backlight now actually works, but the minimum backlight setting is…
Ruben Bakker
  • 2,360
46
votes
8 answers

How do you change brightness, color and sharpness from command line?

I am controlling my PC with SSH and scripting. How can i change the brightness, color and sharpness from command line? Try 1: failed $ sudo redshift -t 5000:5000 -g .5 Cannot list GNOME panel applets. Initialization of gnome-clock failed. Trying…
user25165
44
votes
13 answers

Brightness fn key shortcut doesn't work on ASUS laptop

The brightness shortcuts via fn key don't work. I tried each solution from this answer and its comments. After editing /etc/default/grub file I…
Ionică Bizău
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  • 25
  • 89
  • 129
39
votes
5 answers

How do I set default display brightness?

Is it possible to set the default display brightness so you don't have to re-adjust it everytime you reboot? My laptop display is killing my eyes at the login screen already because it starts at 100% brightness every time.
Jeremy
  • 391
35
votes
9 answers

How can I change brightness through terminal

Now I can change it by Fn+ arrow right but now I need to do it via my shell script
RiaD
  • 1,395
34
votes
20 answers

Brightness not working after installing NVIDIA driver

I recently installed Ubuntu 11.10 on my Mac Book Pro 7,1. I installed the NVIDIA driver (285). The brightness keys are working (F1 and F2) and I get the box showing the brightness but it does nothing. I can change the brightness in the NVIDIA X…
YFGD
  • 351
34
votes
20 answers

Cannot change backlight brightness Ubuntu 14.04

This morning I found that I cannot change the brightness of my Dell XPs 13 laptop's display anymore. I tried the following to change the brightness Use keyboard brightness keys Run the commands shown below Boot with kernel option…
Lespaul86
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