A backlight is a form of illumination used in liquid crystal displays (LCDs).

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2answers
26 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 ...
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0answers
10 views

14.04 increasing backlight above a certain level does not work

I've read every topic I came across but couldn't find a problem similar to mine. I have a laptop with ati graphics card and have fglrx installed. my function keys for increasing - decreasing ...
3
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1answer
1k views

Ubuntu 15.04 Suspend doesn't run `pm-suspend`

After upgrading to Ubuntu GNOME 15.04 (from 14.10), I noticed my pm-utils hooks in /etc/pm/sleep.d aren't running anymore on suspend/resume. I have a custom script which saves the brightness before ...
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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 ...
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0answers
29 views

keyboard backlight not working. Toshiba Qosmio x770-11z

Every ubuntu version I tried, since 12.04, the keyboard backlight never worked. Right now, I'm using ubuntu 14.04 and tried the 14.10 and 15.04 versions and didn't work either. It works until I reach ...
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2answers
2k views

How to turn off keyboard backlight of and Alienware M14X laptop

OK, I have an Alienware M14X and the keyboard backlight is always on and I can't turn it off... Google didn't me much. I want to turn it off because it's disturbing sometimes I uninstalled Windows ...
0
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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 ...
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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 ...
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0answers
27 views

*ERROR* Cannot find a backlight controller

So I just updated my kernel version on Ubuntu 15.04 64bit to Kernel 4.0.5 latest mainline. Now every boot of my laptop, I got this error. starting version 219 _ ...screen blink... starting version ...
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1answer
2k views

How can I enable keyboard backlight on sony vaio pro with ubuntu 13.10

How can I enable keyboard backlight on Sony Vaio pro with Ubuntu 13.10? I have already tried setting the bit in /sys/devices/platform/sony-laptop/kbd_backlight with echo 1 | sudo tee ...
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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 ...
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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 ...
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0answers
37 views

How to display correct keyboard backlight levels?

I have a DELL latitude E6420 running Ubuntu 14.04 LTS. When pressing Fn+right button, I am able to change the keyboard backlight (works good), but on screen, this on screen notification (notifyOSD), ...
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0answers
45 views

Brightness issue with Samsung laptop

I just installed Ubuntu on my Samsung NP470R5E laptop. When the charger is plugged in while booting my brightness is full, otherwise it gets dimmed. It doesn't matter if I plug my charger in or out ...
0
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0answers
60 views

Ubuntu 14.04 Black Screen after login (due to changed brightness?)

I have an hybrid switchable (AMD+Intel) PC, where I have both ubuntu and windows 7. Two days ago I was using Ubuntu, and since the battery was low I lowered the brightness. Usually, when I lowered ...
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3answers
281 views

systemd-backlight on Ubuntu 15.04

Hey people of the internet! I have a problem saving/restoring the brightness on my laptop... I am running Ubuntu 15.04 server, with Xfce4, but booting default to command line. My problem now is, ...
7
votes
1answer
195 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 ...
0
votes
1answer
83 views

Backlit keyboard

I have a dell vostro 3650 running newest Ubuntu install. I read this laptop has a backlit keyboard. I've researched how to turn it on with no luck. I've tried hitting the Fn F6 keys and the Fn right ...
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0answers
33 views

Can't keep monitor backlight off with xset

I use xset dpms force off and the backlight turns off but it turns back on in a minute on its own. The command setterm -powersave powerdown gives the message: setterm: cannot (un)set powersave ...
16
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6answers
45k views

How to make keyboard backlight Fn buttons work in Samsung Series 9?

I've just installed Ubuntu 12.10 on my Samsung 900X4C. However, I can't get the keyboard backlights to work. I added the keymaps as per community docs - Samsung Series 9 (section Function Keys). But ...
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0answers
223 views

Can't change screen brightness running Ubuntu 14.04LTS on Samsung NP510R5E

FIXED! After DBANing my hard drive I installed Ubuntu 14.04LTS and quickly realised I've been unable to change screen brightness. This isn't too much of an issue when AC power is plugged in as the ...
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0answers
92 views

Ubuntu 14.04 Lenovo IdeaPad Z500 backlit keyboard not working

I am hoping someone can help me... I am increasingly becoming a fan of Ubuntu so I decided to load it on to my home laptop which is a Lenovo IdeaPad Z500... Everything seems to work except for the ...
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1answer
354 views

Backlight change with FN keys do not work on Asus

I know this was asked many times but I do not understand how there is no real solution. I hop e someone can help. The problem: Asus g53 laptop, Ubuntu 14.04, KDE 4.13.3 Fn + f5-f6 should change the ...
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0answers
68 views

Backlight Brightness is not adjustable - Dual Boot with Win8.1 and two graphic chips

I'm really sorry to ask again a FAQ, but all suggested solutions does not work out. I have problem with the backlight brigthness controll. Ubuntu response to pressing Hotkeys with an poping up the ...
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0answers
61 views

Can't disable keyboard backlight on Sony vaio sve15115fxs (ubuntu 14.04)

As the title states, I'm having trouble disabling the backlight on my keyboard for this laptop. It's currently on dual boot with Ubuntu 14.04/win 7. I've tried the following command sudo su -c "echo ...
0
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1answer
137 views

Ubuntu in VMware 11 and Cooler Master LED keyboard

I just want to try Ubuntu Linux. Basically Linux for learning purpose. And that's the reason I have installed Ubuntu 14.04 LTS (Trusty Tahr) x86 on my VMware 11. The problem is this: I am using ...
0
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1answer
220 views

No keyboard backlighting

I have bought an MS-industral Fusion keyboard.The keyboard supports backlighting and I have tested it on my friends Windows 7 and it worked.I am using Ubuntu 14.10 and backlighting does not work.All ...
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0answers
20 views

I messed up my lighting controls when trying to fix backlight issue

I had a issue with adjusting the backlight so I went to a post which told me how to fix it. This is the thread: ...
0
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0answers
26 views

Keyboard backlight timer

when I’m using Windows my keyboard backlight turns off after an amount of time of not using the keyboard,is there a way to do that on Ubuntu? Thanks.
10
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5answers
8k views

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 ...
0
votes
1answer
223 views

/sys/class/baclight folder is empty, leading to blank screen [duplicate]

I recently tried to change the default brightness of my ubuntu by echoing values to /sys/class/backlight/acpi_video0/brightness, and installing xbacklight, as suggested by answers to other questions. ...
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0answers
60 views

How to increase Kubuntu 14.04 brightness range?

Hold your horses!. If you are hurrying to flag this as a duplicate of this question or this question, none of those have an answer to what is asked here. Thanks for the attention though. In ...
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0answers
26 views

Brightness resets after changing it manually

Every time I use the shortcut keys or xbacklight to change my screen brightness, it reverts a second later to no backlight. For example, I run xbacklight -set 50 and the screen brightens for a second ...
0
votes
1answer
1k views

GT70 2PE Dominator Pro (or equal) keyboard backlight

Just installed Ubuntu 14.04 on my laptop and have been searching the internet for a couple of hours, trying to get my keyboard's backlight to work . I know it works out of the box when you hit the ...
0
votes
1answer
199 views

Can not change backlight brightness on samsung laptop

Whenever I try to change the backlight brightness with the fn+f1 or fn+f2 keys, the gui does show that the brightness is being adjusted. However the actual brightness stays the same, until I get to ...
1
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1answer
199 views

Laptop brightness too low on Ubuntu 14.10

recently I switched to Ubuntu Gnome 14.10 64 bits on my laptop and I'm having some issues with the brightness. At first I couldn't change with the hotkeys, but I have already fixed it. The problem now ...
0
votes
1answer
483 views

How can I keep my backlight from turning off on my Lenovo G50-30 laptop?

How would I keep the screen backlight from going out after a very short time? My laptop is the Lenovo G50-30 and this is causing me issues with this happening all the time. Could you please assist me ...
3
votes
0answers
125 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 ...
1
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0answers
78 views

keyboard backlight is not working

I have just bought a new computer and I installed ubuntu on it but the problem is that I've lost my keyboard backlight here is my computer ...
0
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2answers
168 views

Lenovo Thinkpad L Brightness Level Intervals

I'm using Ubuntu 14.04. Everything worked out of the box on my L440. The only thing that bothered me was the brightness levels. I can change it by pressing fn + F5 or F6, but there are only a total of ...
3
votes
5answers
3k views

After installing fglrx on Ubuntu 14.04 there is no backlight (hd 5470). Is there any workaround?

I've installed fglrx driver on my Asus k52je laptop with mobility radeon hd 5470 using additional drivers window in ubuntu. I get black screen after reboot. When I hold power button i can barely see ...
6
votes
2answers
1k views

Time to dim the screen in Ubuntu 14.04

Ok so it seems that the key in org.gnome.settings-daemon.plugins.power idle-dim-time is gone in the new Ubuntu version. Since the old method Increase screen idle dim timeout doesn't work anymore are ...
0
votes
1answer
2k views

FN + F7 don't work (before allowed me to turn on/off display)

Here's my problem: I had Ubuntu 8.04 on this Notebook Asus 1015 px and the combination fn + f7 worked well and I could turn on/off the display at my leisure. Then I formatted and started a "new ...
0
votes
1answer
54 views

Lower Minimum Screen Brightness

By using /sys/class/backlight/ the screen brightness can go lower than when using the function keys to do so. Is there a way to change the minimum level used by the function key method, rather than ...
8
votes
11answers
5k views

How to increase brightness in smaller steps?

Is there a way to adjust lighting step ? I have Lenovo L520, and Fn + Light Up or Down adjusts by 20%, how can I adjust the step to 10% ? it will help me fine tune lighting at my dark room.
1
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1answer
390 views

Disable brightness and keyboard back-light at start-up?

I'm new with Linux and I have an issue that I have being researching and have not been able to find a solution so far. I was wondering if any help can be given. I have an Asus Q500A with Win-8 and ...
4
votes
3answers
4k views

Why does Ubuntu reset brightness settings at the loading screen?

Since I first installed Ubuntu 11.10, I noticed that volume and screen brightness get reset every time Ubuntu starts. Why is this so? And what ways are there to keep brightness and volume levels ...
0
votes
0answers
102 views

change screen brightness

I've got a strange situation and I'm hoping someone can shed a light on it. I re-installed my dell laptop (and switched from unity to gnome) today and (as expected) dimming my screen didn't work. So I ...
0
votes
1answer
61 views

Backlight issue on dell xps

I just installed Ubuntu on my dell XPS and everything seems to work fine but the backlight that is constantly turn off. I've tried several options read through previous posts but none of those ...
0
votes
1answer
286 views

Assigning a default Keyboard backlight

I have installed UBUNTU 14.04 on an Asus G56JK laptop with keyboard backlight. The keyboard backlight control function keys are working properly, allowing four levels of brightness from 0 (no light) ...