Questions related to screen brightness.

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0
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1answer
86 views

How to Disable Ubuntu Phone “auto dim” function?

Is there a way to disable the auto dim function of the Ubuntu Phone (14.10 r22)? Even though I can disable the auto-brightness function and set the screen timeout to 10 minutes (or never) the screen ...
1
vote
0answers
54 views

Editing system settings not working

So this happened after I tried to plug an external monitor into a 10,1 Macbook Pro running Ubuntu 14.04 64-bit. I first started playing with nvidia-settings without success and then I tried to ...
0
votes
0answers
118 views

my ubuntu 15 dose not boot on lenovo e440 . unsupported brightness interface

I have lenovo e 440 thinkpad and I'v installed ubuntu 15 on it. every thing worked fine. but know when I power on my laptop ubuntu dose not boot and it says : unsupported brightness interface . what ...
0
votes
0answers
41 views

Brightness is set to 0 and I'm not able to change it

I changed my brightness to 0 and kept the laptop running and after few hours battery died and the laptop was turned off. Now whenever I turn on the computer after the splash screen goes dark. If I ...
0
votes
0answers
55 views

ACPI special keys all have the same code

I've ran into the problem of my brightness keys (and everything but my volume keys) not working. I've been following this guide on how to fix them: https://help.ubuntu.com/community/LaptopSpecialKeys ...
3
votes
1answer
408 views

Using /etc/rc.local to turn off keyboard backlight no longer working in 15.04

I have an Asus laptop, and the keyboard backlight comes on full at startup. I formerly used the instructions here to issue a sudo command to turn it off. Basically, the steps were: gksudo gedit ...
0
votes
0answers
272 views

Ubuntu 15.04: unknown display & can't change brightness

I have Ubuntu 15.04 on my Toshiba Satellite A500-14H with ATI Mobility Radeon HD 4650. First Problem: When I go to settings - display devices (hardwares), it tells me "Unknown Display". I get the ...
1
vote
2answers
416 views

Unable to shutdown, restart or logout

I am unable to shutdown, restart or logout from my ubuntu 14.04 machine. The screen goes blank, but the system hangs, then the fan begins to run fast. I have to turnoff the laptop by pressing and ...
1
vote
1answer
444 views

cannot adjust brightness in ubuntu gnome

I just installed ubuntu 14.04 gnome edition. I cant change my brightness using my keyboard shortcuts. I tried to install a gnome shell extension, but its not compatible with ubuntu 14.04. I cant find ...
27
votes
6answers
40k views

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% ...
0
votes
1answer
48 views

control brightness on pc

I want to control brightness on pc. There isn't any setting for brightness. I can control brightness on monitor but I want to change it more. Screen is too bright. I also want something that change ...
3
votes
0answers
448 views

Ubuntu 15.04 - Dual monitor problems

I installed Ubuntu 15.04 and I have problem with my 2 monitors. I was googling so long time and didn't find any working solution for this. 1) I need to set my left monitor primary before login ...
2
votes
1answer
173 views

Laptop backlight sets to maximum at startup (Xubuntu 15.04)

I've tried many solutions I've found on the Net, but had no luck with them: Tried first with xbacklight = value: output is No outputs have backlight property. Then I tried with GRUB options like ...
2
votes
2answers
5k views

Message {1.079026} ACPI PCC probe failed; starting version 219

I am running Ubuntu 15.04 (Vivid Vervet) with 3.19.5-031905-generic #201504211114 kernel and GNOME Shell 3.14.4 on a Samsung NP370R4E laptop. When I boot up, I see [1.079026] ACPI PCC probe failed ...
0
votes
1answer
126 views

Custom Function Keys

The brightness keys don't work on the UX305 so I managed to bind Ctrl+F5/6 to execute xdotool key --clearmodifiers XF86MonBrightness{Up/Down} While this works fine and even shows the visual ...
0
votes
0answers
52 views

Can't change brightness when plugged off (ubuntu 14.04)

I have a Samsung NP470R4E and recently installed ubuntu 14.04, but can't change brightness when the laptop is not charging. The Fn brightness keys seem to work (e.g. the upper right bar appears and ...
0
votes
2answers
815 views

Can't change brightness of laptop in ubuntu 14.04 / 15.04

When i just try adjusting brightness, the indicator changes but the screen does not change brightness. I have tried adding acpi_backlight=vendor to my grub file and also doing echo x > sudo tee ...
0
votes
1answer
88 views

Change brightness works in Unity but not spectrwm

I use spectrwm so I want to be able to adjust the screen brightness using command line tools. However, none seem to be working. The odd thing is that if I run Unity and access the "Brightness" ...
2
votes
0answers
27 views

Brightness slider is too fine (14.04)

I'm running ubuntu 14.04 on a Dell laptop (XPS 13 Developer Edition). The brightness slider stopped working (the slider would fill up and empty as usual but the brightness wouldn't change). This fix ...
21
votes
8answers
27k views

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
0
votes
1answer
2k views

Fn keys can't adjust brightness MATE desktop

I just installed Ubuntu 14.04 and removed Unity and installed MATE. Now, the Fn keys on my keyboard can't adjust brightness. Here's the thing that makes it extra extr confusing: my brightness worked ...
1
vote
0answers
57 views

Brightness control not available in ubuntu 14.04 acer veriton desktop

I have just installed ubuntu 14.04 on acer veriton desktop and can not reduce the screen brightness. Below is a screen shot of the 'brightness and lock' settings. Unfortunately it does not show any ...
1
vote
2answers
7k views

How to disable screen dimming in 14.04?

When I am inactive for 4-5 minutes, the screen is automatically dimmed. This is too much boring when I am watching movie. How to disable this thing??
0
votes
0answers
136 views

Brightness control not working on Ubuntu 14.04 with 3.19 kernel

I'm using Ubuntu 14.04 64-bit with kernel 3.19.0-22-generic, and the brightness control doesn't work anymore on my Samsung Chronos 7 laptop (NP770Z5E). On a 3.13.0-54-generic kernel the brightness ...
0
votes
1answer
203 views

Ubuntu 14.04 = fn+f2/f3 (backlight) keys not working

With 14.04 LTS Ubuntu (64-bit), using any of the offered kernel solutions (including ones from the newer releases up to 3.19), f2/f3 brightness controls fail to register. As a matter of fact key ...
3
votes
3answers
2k views

Hot keys brigtness issues with Ubuntu 14.10 in Acer Aspire 5755

I have a Acer Aspire 5755 with Intel video graphic, on Ubuntu 14.04, the combination Fn+←/→(Right/left) arrows can increase/decrease the brightness screen. Works fine on unity and with a ...
2
votes
0answers
466 views

Xubuntu 15.04 black screen after screen lock

I am using Xubuntu 15.04 with Xfce 4.12 in a Dell Inspiron 14 laptop, model 3442. Whenever I lock my screen, then put my password and unlock it, the screen brightness gets very low, it's almost as if ...
0
votes
0answers
44 views

The keyboard brightness controls don't work until after suspend on HP Compaq 6720s

I'm using Ubuntu 14.04.2 amd64 on HP Compaq 6720s. The volume controls work but the brightness controls don't. I did find however that they work only after I suspend the computer and turn it back on. ...
0
votes
1answer
281 views

Fixing brightness levels in 15.04 with systemd

I'm using a MacBook Pro (Mid-2012 model; MacBookPro9,2), dual-booting OS X Yosemite with Ubuntu 15.04, and I'm having an issue with the keyboard backlight brightness. Apparently this issue has been ...
0
votes
1answer
80 views

how to make britness control work on ubuntu 14.04 with nVidia graphic card?

I have a Sony vaio VPCEJ equipped with an Nvidia Gforce 410m with cuda ,currently I am under ubuntu 14.04 and using the Nouveau Nvidia driver for my graphic card because I found it to be the most ...
0
votes
0answers
87 views

Backlight fuction not working lenovo z570 intel i5 nvidia geforce

Processor Intel® Core™ i5-2410M CPU @ 2.30GHz × 4 Graphics GeForce GT 525M/PCIe/SSE2 I can't change the backlight, it's always set on high. Even though when the system goes to sleep, the light gets ...
2
votes
2answers
558 views

How to set automatic brightness in macbook pro?

I have just installes ubuntu 14.04 in my macbook pro, and I already configure all but the keyboard and screen brightness. In OS X, the brightness is controled automatically, I want to know if this is ...
0
votes
0answers
127 views

How to make turning off Logitech K810 keyboard back light automation

I could not find terminal command to turn off the back light of keyboard. For example the following commands do turn off my laptop keyboard back light : sudo chmod 777 ...
1
vote
2answers
82 views

What to choose as application to launch Brightness-Controller?

I'm new in *ubuntu. I'm using lubuntu 14.04. When I'm trying to download Brightness Controller it is saying This link needs to be open with an application. Which application to choose? Actually ...
0
votes
1answer
42 views

Toshiba screen backlight only works occasionally

I am having a weird problem - I recently installed ubuntu 14.04 and the backlight doesn't work consistently. If I power off my machine and leave it sit for an hour or two, the screen will work fine ...
0
votes
1answer
149 views

Brightness adjust Ubuntu vs Xubuntu

I have little problem: LiveCD with ubuntu 14.04 can adjust brigthness on laptop and with xubuntu 14.04(installed from mini.iso) What package i need to install for brightness adjustment. OS ...
0
votes
0answers
42 views

brightness shortcut doesn't work on 15

I'm using hp 530 with ubuntu 15 the brightness shortcut (fn + f7 and fn + f8) doesn't work when I shutdown computer and start it again but when I suspend it and start it ,it work correctly.... I ...
0
votes
3answers
257 views

Brightness control not working for ubuntu 14.04

When pressing brightness control buttons on my laptop, there is no change in brightness. Brightness is set at a very high level and it hurts the eyes. Provide some solution ASAP.
0
votes
3answers
75 views

i can not edit file even after entered root password

i want to edit actual_brightness with gedit in (/sys/class/backlight/acpi_video0) to change brightness level. my way is pressing alt+f2 then gksudo gedit then enter the password after editing the ...
1
vote
1answer
646 views

Lubuntu Display brightness

Just installed Lubuntu 14.10 on my machine. I cannot change the display brightness. I have a slider in my power settings but it does nothing. Cannot post screenshot of the slider because of no rep ...
0
votes
0answers
205 views

Screen brightness not changing Macbook Pro 13 Retina 11,1 Ubuntu 14.04

Just installed Ubuntu on my mac and when I press the brightness keys the meter shows that it it decreases but the screen brightness remains the same. How do you fix this issue?
1
vote
2answers
2k views

screen brightness control not working: Lenovo g50-45: AMD Radeon: Ubuntu 14.04

I've a Lenovo G50-45 machine with AMD processor [Radeon APU A4-6000 with R2 Graphics]. I tried the solution from Rmano but no success. Using Ubuntu 14.04. I tried the solution pasted here: Ubuntu ...
1
vote
2answers
2k views

brightness control not working in 14.04 (dell inspiron 3537)

brightness control not working when keys are pressed with Fn key. it shows indicator on top right corner increasing & decreasing but nothing happens.
0
votes
1answer
302 views

screen brightness on X1 carbon gen 3 wont change

I just installed ubuntu on a new x1 carbon gen 3. Its a great machine but i cant seem to change the screen brightness. when i hit the buttons i get the little on screen notification, but it seems to ...
1
vote
0answers
70 views

Can I display volume or brightness popup using command?

When you adjust your brightness or volume in ubuntu, you would see a popup notification in the top right corner of the screen to notify you the level of brightness or volume. Just as follows: I can ...
0
votes
1answer
566 views

ASUS X555LN Brightness fn key not working in Ubuntu 14.04

I have installed Ubuntu 14.04 on my ASUS X555L Laptop using an nVidia GeForce 520M Graphics card. The fn+f5/f6 keys are unable to adjust brightness. Currently my screen brightness level is maximum. My ...
7
votes
2answers
4k views

How to adjust contrast with xcalib

I'm trying to adjust contrast on my laptop, a ThinkPad E430, running ubuntu 12.04: xcalib -co 70 -a xrandr --output LVDS1 --brightness 0.7 Either of them works only for 1-2 seconds and after that ...
1
vote
6answers
6k views

Unable to change brightness on a Toshiba L750

So, as a number of users seem to be experiencing, I am unable to change brightness on my laptop. Using the Brightness and Lock in settings, the slider moves but brightness does not adjust. The fn keys ...
2
votes
5answers
4k views

Asus UX303LAB brightness keys do not work

I am a beginner at using linux and I have been trying to get Ubuntu to work with the ASUS ZenBook UX303LAB (Broadwell version). I am having problems with Brightness keys, keyboard backlight brightness ...
2
votes
1answer
6k views

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: ...