Questions related to screen brightness.

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0
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3answers
29 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
3k 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 ...
1
vote
2answers
31 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 ...
1
vote
2answers
890 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 ...
0
votes
2answers
1k 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
2answers
4k views

Brightness options in Ubuntu 12.04 desktop missing

I am unable to change the brightness of my desktop screen using this path. System settings{top right corner of the screen)>Under Personal Brightness & lock.No option to change brightness is ...
0
votes
0answers
5 views

How to turn 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 ...
0
votes
1answer
14 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 ...
0
votes
0answers
8 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
38 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 ...
84
votes
18answers
72k views

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. ...
6
votes
2answers
3k 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
0answers
131 views

FGLRX drivers boots without backlight

Fglrx Not working after install (I know) HW : Asus K72j with AMD HD5470 laptop So, after installing the ATI drivers fglrx on my ASUS K72J laptop via CL my screen booted black. So at first I thought ...
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 ...
1
vote
1answer
6k views

atheros wireless ar9285 driver

I have been having problems with wireless on Ubuntu 10 and above, Mint 11 and above. The problem is in the driver for the wireless... I can see that there is no driver installed and yet it works but ...
0
votes
2answers
294 views

Fn+F5,F6 keys to adjust brightness doesn't work

I have an Asus N56JK computer and I have tried many different options such as updating the Grub file in /etc/default/grub but to no avail. All other Function keys seems to be working but only function ...
5
votes
5answers
20k views

How to make my screen brightness not change when I plug my laptop in

I do not want my laptop to change brightness when my laptop power is plugged in or unplugged. I set my brightness based on how bright my surroundings are. If I am in a dark room, I set my brightness ...
1
vote
5answers
456 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 ...
0
votes
1answer
2k 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: ...
1
vote
2answers
2k views

Can't change brightness on Toshiba l755 laptop

I have a Toshiba l755 laptop, and I installed 12.04 64bit on it. The default brightness of the laptop is set to maximum value, and I can't change it. If I go to Configuration → Brightness, the ...
0
votes
0answers
16 views

Software controller for any ATI/Nvidia GPU

I wanted to know which GPU to buy for my new PC in order to: 1) Work with Ubuntu. 2) Manage the contrast, brightness... etc. This is really important as I normally have my screens very dim (Via ...
0
votes
0answers
20 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
14 views

XModMap Key Remapping Not Totally Working

I have a Mac Keyboard I am using with new version of Ubuntu. Whenever in a web browser, I try and hit the F5 key to naturally refresh the page but in Ubuntu this key seems to be mapped to Keyboard ...
0
votes
0answers
20 views

gedit error gedit:2128

I am a beginner Linux user I use Lubuntu Core... I have been trying to add echo 9 > /sys/class/backlight/acpi_video0/brightness to /etc/rc.local and every time when I change something in ...
0
votes
0answers
14 views

Notifyd brightness notification not showing properly

I have the exact same problem described here. I'm using an nvidia driver and it was all right (I had to use a similar procedure to have my brightness control working). My xorg configuration files are ...
0
votes
2answers
380 views

Brightness keys not working and no obvious interface for adjustment either

New to Ubuntu and so far pretty happy with it but one niggle is the brightness controls do not seem to work. I have looked at fixes on here + google but nothing seems to get it right. Mostly effecting ...
1
vote
1answer
4k views

Fn keys for Brightness not working on Toshiba Satellite L755

I am running Ubuntu 12.04 and I love it! The only problem is the keys for my brightness, F6 and F7, does not work when I am on battery power or AC power. It randomly works after I am idle for a while ...
0
votes
0answers
56 views

Adjust screen brightness option missing in Ubuntu 14.04 LTS

I understand that there are command-line alternatives to this but I'm trying to figure out why the option is missing from my Brightness-Lock menu under system settings. The highlighted portion of ...
0
votes
2answers
910 views

Change brightness on Asus G53JW with Ubuntu 14.04

I have an Asus G53JW and I can't manage to change the brightness anyhow (fn hotkeys are not working). I used Debian for 6 months and had the same issue and never found I way around this. I did ...
0
votes
0answers
28 views

How to Remap Brightness Keys

I have a Dell laptop which has some fairly standard media keys along F1-F12 as well as three special keys by the power button. For the longest time, my brightness down button hasn't worked. For some ...
1
vote
2answers
5k views

No back light on my Acer Aspire 5734z

I installed Ubuntu (12.04) on my Acer Aspire 5734z and the back light stopped working. I have tried the fix by editing the grub file posted on here a couple of days ago but that hasn't fixed it. I ...
0
votes
1answer
15 views

Nvidia Higher Resolution becomes bright and grainy

Does anyone know how to solve this issue? I'd like to use the higher resolutions, but when I do the display becomes annoyingly bright and grainy. I can confirm it happens on the Geforce 610 and higher ...
0
votes
1answer
12k views

Unable to adjust brightness in Ubuntu/Xubuntu/Lubuntu13.04

I've recently upgraded to Xubuntu 13.04 and noticed that I'm unable to use the brightness keys to adjust the brightness of my screen. I've tried just about everything this thread suggest and I'm still ...
5
votes
1answer
945 views

How to increase the screen brightness control sensitivity?

In Ubuntu 13.04, when I use the keyboard hotkeys to control my screen brightness, I only get 5 steps to go from the darkest to the brightest level, for a total of 6 levels. However, I noticed a ...
1
vote
0answers
33 views

Screen Dimming Anomaly

My Lenovo G780 with Ubuntu 14.04 is fine when the AC charger is plugged in. However, when unplugged, if my mouse does not move for ~12 seconds, the screen dims a bit, but this is not detected by my ...
0
votes
1answer
3k views

How to adjust brightness on Lubuntu?

I can't adjust my screen brightness. Indeed, I can't find this option in my system parameters. I am using Lubuntu 12.04. Thank you for your time :)
1
vote
0answers
60 views

How to make the ambient light sensor work on Asus Zenbook UX303?

I have a Asus Zenboo UX303LN. There is a known issue with the brightness keys, which is no big deal for me but I would like the ambient light sensor to work. I didn't find much information on this ...
0
votes
1answer
28 views

Remap Fn+F3 from XF86Sleep to XF86MonBrightnessUp

I have got a new laptop which is Toshiba Sattelite Pro R50 and I've installed Linux Mint 17.1 on it. After a while it turned out brightness buttons are mapped incorrectly. Fn + F3 is mapped to ...
14
votes
12answers
62k views

How to control Brightness

I didn't install anything myself, but only Ubuntu 12.04 LTS on an Acer 4741g. I use Fn+left/right to change the brightness, but failed. How can I control the brightness levels?
0
votes
0answers
15 views

Brighness and Lock now working

I installed xscreensaver but this ended up not being what I needed. So I removed it. But now My system wont lock the screen like it use to. The settings are set to lock after 1 min and ask for a ...
23
votes
4answers
4k views

Use webcam to sense lighting condition and adjust screen brightness

Is there a way to have my webcam sense lighting conditions and adjust screen brightness accordingly?
1
vote
2answers
82 views

screen brightness

Regarding the below topic please tell me is that possible to do it without adding any script to the startup. brightness of the screen So, I could use the function keys to adjust the screen ...
-1
votes
1answer
70 views

brightness of the screen

Every time after I restart I have to enter this in the terminal to set the brightness: xrandr -q | grep " connected" xrandr --output LVDS --brightness 0.5 Could someone tell me if there is there ...
0
votes
1answer
61 views

Screen Dimming Changed After Upgrade to 15.04?

Up until this week I was able to dim my laptop to a very dim setting, barely any brightness at all, which I liked at night. After upgrading to 15.04, the maximum dim is way brighter than it was ...
4
votes
6answers
12k views

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 ...
2
votes
1answer
161 views

14.04 on Asus GL552JX: Fn+F5 and Fn+F6 Brightness Problem

I've recently installed Ubuntu 14.04.2 LTS on my ASUS GL552JX. The one that always bugs me is the Fn+F# button functionality. This time, all Fn+F# button combinations work except for Fn+F5 ...
1
vote
0answers
37 views

Backlight control broken on 14.04 on Lenovo U310

I'm unable to change the backlight brightness under 14.04. habefaro@habefaro-Lenovo-U310:~$ uname -a Linux habefaro-Lenovo-U310 3.16.0-34-generic #47~14.04.1-Ubuntu SMP Fri Apr 10 17:49:16 UTC 2015 ...
1
vote
0answers
67 views

Special Function Keys are not working in Ubuntu 14.0.4.2 LTS

Volume (+/-/Mute), Brightness (up/down), Disable Webcam, Mute Microphone and Projector Function keys are not working (when used through laptop keyboard) but Next, Pause/Play and Previous keys are ...
0
votes
0answers
56 views

How do I can reset brightness settings to default by Live ubuntu?

I tried to set my machine brightness via this link (How do I set default display brightness?). After rebooting, I haven't any screen now. I use ubuntu 14.04, Can say me any body that how do I can set ...
0
votes
1answer
43 views

Brighness control problem

I'm using 14.04LTS. The function keys that control brightness have been reversed such that when I press Fn + right arrow key, the brightness reduces and when I press Fn + left arrow key, the ...