Questions related to screen brightness.

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9
votes
1answer
209 views

Disable automatic brightness according to content in Ubuntu 14.04

I am running Ubuntu 14.04 LTS on a Dell Latitude E3440 laptop. My problem is that screen brightness automatically changes depending on content. This means that the screen gets brighter when the ...
8
votes
1answer
872 views

Display problem when adjusting brightness in ubuntu 12.04

Recently I installed Ubuntu 12.04 on my Dell 1554 laptop. I was adjusting my screen brightness when this happened : this has become a recurring problem which is really annoying. I also want to ...
7
votes
1answer
266 views

“monitor brightness down” key resets brightness before lowering it

My monitor brightness down key resets my brightness before lowering it, effectively leaving me at near max brightness. I do not experience any problems with the brightness up key. I'm using a Dell ...
5
votes
1answer
179 views

Enable [Fn]+[cursor arrows] on lock/login screen to change volume and brightness

Having a new Acer Aspire E17 E5-773G with Ubuntu 16.04 on it, I experience that the keyboard combinations to adjust volume (Fn + ↑/↓) and brightness (Fn + ←/→) do not work on the login screen or lock ...
5
votes
1answer
334 views

Can't change brightness after disconnecting second monitor

When I boot up with 2 monitors, or when I connect the second monitor to my laptop, I can change brightness of the laptop screen in the usual sense. After disconnecting the second monitor, when I ...
5
votes
1answer
1k 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 ...
5
votes
1answer
228 views

Brightness resets to zero on an HP dm4 Pavilion

Everytime I reboot my HP dm4 Pavillion the brightness is zero on my screen. BTW I use a Ubuntu 12.04..
4
votes
1answer
90 views

Brightness control is blocked after reaching minimum

Several days ago I tried to fix a quite popular problem. I have Ubuntu 15.10. In my computer the brightness control keys weren't working. I have added a file /usr/share/X11/xorg.conf.d/20-intel.conf ...
4
votes
1answer
100 views

Can I adjust the minimum brightness for my laptop's LCD?

I'm running Ubuntu Gnome 15.04 on my Dell XPS 13 (9333, 2014 model). The LCD brightness can be controlled by the keyboard, and if possible I'd like to adjust the minimum value and/or adjust the ...
4
votes
1answer
1k views

Ubuntu 15.04 brightness doesn't work

brightness on my Lenovo-IdeaPad-P400-touch graphic Intel® Ivybridge Mobile os type 64-bit Ubuntu 15.04 doesn't increase or decrease after updating from 14.04 please help!!!
4
votes
1answer
318 views

Lowest brightness setting turns backlights off

I am running Ubuntu 14.10 on a Laptop. When I turn my brightness to the lowest setting it actually turns my backlights off and my entire screen goes black as if my computer was turned off. I have ...
4
votes
1answer
450 views

Unable to change screen brightness with hotkeys on Ubuntu 14.10

Just upgraded to Ubuntu 14.10, and now my brightness keys aren't working. Is there a fix for this? I suspect that Linux kernel 3.16 is the culprit...
4
votes
1answer
687 views

Ubuntu 14.04 locks screen without dimming during fullscreen video playing?

I upgraded from 13.10 to 14.04 yesterday, and it appears that something has changed concerning how screen dimming works during fullscreen video playback. This problem does not occur during video ...
4
votes
1answer
2k views

Specific function keys not working

My Toshiba C800 laptop (12.04 LTS desktop) has special function keys as follows: fn + : F2 -> BRIGHTNESS DOWN F3 -> BRIGHTNESS UP F4 -> DISPLAY SELECT F5 -> TOUCH PAD on/off F6 -> PREVIOUS ...
4
votes
1answer
813 views

Remap function keys to commands?

I'm running Ubuntu 12.04 on a Samsung Series 9 (900X3A-A03), and changing the brightness through the function keys or the brightness control UI causes flickering and general instability, so I have a ...
3
votes
1answer
109 views

Brightness is reset to Maximum on every Restart in Ubuntu 13.10

I have upgraded from 13.04 to 13.10. After every reboot the brightness is set to maximum. Is there any solution?
3
votes
1answer
1k views

I can't modify the screen brightness on Xubuntu 13.10

I got this problem with brightness on my fresh xubuntu 13.10 install.. It ain't inc/decrease the screen brightness when pressing Fn+F5/F6 !! I've tried some solutions like setting these values in ...
2
votes
1answer
38 views

Ubuntu 14.04 brightness preference option

The lighting preference option seems to allow increased lighting adjustment but after re-setting the screen darkens! When I check the setting it has returned to the previous position. Is there a ...
2
votes
1answer
224 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
1answer
1k 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 ...
2
votes
1answer
3k views

Display brightness problem on ThinkPad X1 Carbon 2015 (3rd Gen)

I now obtained brandnew ThinkPad X1 Carbon 2015 (3rd Gen) (20BS). Almost of setup has been done, but one problem remaining. Display brightness. << What I had done >> Reference pages are Lenovo ...
2
votes
1answer
2k views

Any way to enable dynamic/automatic brightness adjustment?

My Lenovo ThinkPad X201 Tablet has a very bright screen (400 nits!), which is good for when objects on the screen are dark (say a night scene in a movie), but it is of course very blinding when ...
2
votes
1answer
79 views

Adjusting default brightness upon boot

When I boot to ubuntu 12.04, the back light on my display turns off and I have to press the increase brightness button 4 times to get it to the desired brightness. Is there a terminal command I can ...
2
votes
1answer
96 views

Xubuntu 13.10: Only four levels of brightness?

Why do I have only four levels of brightness on my Dell Inspiron laptop, selectable by Fn+ArrowDown/Up? In Linux Mint Mate, I have 7 or 8, and so I have under Windows, on the same machine? This is ...
2
votes
1answer
1k views

Auto-change in brightness after reboot Ubuntu 13.10

I have noticed that after I set the brightness (High to Low) in Ubuntu 13.10 and then after when I do my work. After rebooting up the PC, the brightness again turns to High. I'm literally tired of ...
2
votes
1answer
2k views

Modifying brightness control shortcut key bindings

I have a Toshiba Satellite R830 laptop with Ubuntu 13.04.1 64 bit. The Fn + F6 and Fn + F7 buttons adjust brightness until I put my laptop on sleep. On wakeup they don't work any longer. On Ubuntu ...
2
votes
1answer
406 views

How can I enable brightness control on my iMac 11,3?

I have Apple iMac 11,3 (27" LED, purchased in 2011) with a Radeon HD 5750 graphics card. When I installed Ubuntu 12.04 LTS, everything works fine except brightness control. I want to mention that I ...
2
votes
1answer
282 views

Brightness adjustment impossible after hibernation (MacbookAir 3.2, Ubuntu 12.04)

After waking my computer up from hibernation (close lid, open lid) I loose the ability to adjust the brightness with the F-keys and in the settings. It's the only problem I have with ubuntu on my ...
0
votes
0answers
22 views

Set monitor backlight to minimum level during ubuntu boot

Is it possible to change the default brightness level during boot to the minimum level available.
0
votes
0answers
40 views

Possibility to Limit Processor Utilization by %?

This question refers to the feature in Windows Power Settings that has 2 options: Minimum processor utilization: 0% Maximum processor utilization: 100% Since the default Power Options in Ubuntu ...
0
votes
0answers
113 views

Screen brightness resets when restarting Ubuntu

Every time I start Ubuntu 14.04 the screen brightness resets to default. I would like to keep it at the lowest, yet it keeps changing to highest when I restart. This is a problem that have long ...
0
votes
0answers
45 views

Why Compiz Fusion doesn't work well since Ubuntu 12.04?

Since Ubuntu 12.04 compiz fusion doesn't work well. I don't know why when i active "Cube Reflection Deformation" my screen turns dark. like this: How do I change the brightness in Compiz? and when i ...
0
votes
0answers
40 views

My ubuntu not powering off version 14.04 hp laptop

I am having hp laptop. i installed Ubuntu 14.04. The problem is it is not shutting down. i need to press power button to shut down. i tried almost all steps like changing /etc/default/grub, installing ...
0
votes
0answers
87 views

volume and brightness notifications not working but notify-send do

There is no notification while changing volume and brightness.Volume indicator applet is working fine. notify-send is also working. I think this happened after installing Theme Configuration app(to ...
0
votes
0answers
88 views

14.04 freezes on Acer Aspire 4810T when adjusting screen brightness with keyboard

System hangs only when using Fn key and left and right arrows to change brightness. Does not hang when using slider in System Settings. Already tried this: Ubuntu 14.04LTS hangs when i change ...
0
votes
0answers
158 views

Brightness will not change on Ideapad p400

I recently installed Ubuntu 14 (can't remember which release) to dual boot with Windows 10 on my Lenovo IdeaPad p400 Touch. It gave me the option to upgrade to 15.04, which I decided to do. After ...
0
votes
0answers
58 views

Hardware brightness control on Asus R556LB

I have an Asus R556LB. All my keys but the brightness control work out of the box on the 4.1.2 kernel. I tried booting the kernel with the following extra options acpi_osi= acpi_backlight=vendor ...
0
votes
0answers
20 views

Cant disable touchpad

I am using the latest version of ubuntu and cant disable the touchbad using "fn+F9". F9 has the touchpad symbol and it is crossed out so surely that's the right one. Brightness wont change either with ...
0
votes
0answers
60 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
94 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 ...
0
votes
0answers
317 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 ...
0
votes
0answers
141 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
66 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
0answers
183 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
0answers
53 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
0answers
122 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 ...
0
votes
0answers
43 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
0answers
226 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 /sys/class/leds/smc::...
0
votes
0answers
36 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
113 views

Problem, cannot set brightness on Lenovo Z570

My problem is that I cannot set brightness using fn+arrows and any other way. I'm currently using elementary os base on 12.04 and that problem is not showing, but on every ubuntu with higher number I ...