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

learn more… | top users | synonyms

0
votes
0answers
10 views

How to configure the triggers for my laptop's keyboard backlight?

I want my keyboard backlight to be generally disabled and glow only when I do a manual Fn-key toggle. The problem is that I can not find a way to edit the files - trigger and start_triggers in ...
0
votes
1answer
68 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
0answers
28 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
1answer
35 views

ASUS ROG G551JK Backlight

I am new linux user and I have problem with my backlight. When I press the combination for turning it off, this appears on the screen. I use Ubuntu MATE 14.04 samuel@samuel-G551JK:~$ ls ...
0
votes
1answer
19 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
3answers
62 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
0answers
15 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 ...
0
votes
0answers
50 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 ...
1
vote
0answers
44 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 ...
1
vote
0answers
47 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 ...
0
votes
0answers
44 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), ...
0
votes
0answers
58 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
votes
0answers
77 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 ...
3
votes
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 ...
1
vote
3answers
372 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, ...
0
votes
0answers
51 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 ...
1
vote
0answers
181 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
0answers
300 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 ...
0
votes
0answers
109 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 ...
0
votes
0answers
83 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 ...
0
votes
0answers
71 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
votes
0answers
21 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
votes
0answers
28 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.
0
votes
0answers
63 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 ...
0
votes
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
260 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 ...
0
votes
1answer
638 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 ...
1
vote
1answer
229 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 ...
3
votes
0answers
131 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
vote
0answers
92 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
votes
1answer
151 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 ...
7
votes
1answer
201 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
0answers
104 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
65 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
317 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) ...
1
vote
0answers
108 views

SONY VAIO Turn off backlight, locked windows partition, need help downloading java SEMIDUPLICATE SOS STAT

Sony Vaio SVF15N17CXB Turn off keyboard back-light Sony (VAIO SVF1521DCXW) Hello all, Total newbie, tried to dualboot but ubuntu locked up my windows partition, my windows is locked and i need 10 ...
0
votes
2answers
416 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
192 views

How to do monitor brightness changes on the desktop like on the laptop?

On a laptop you usually have working keys for changing the backlight and you see OSD notifications while changing them. How to patch this up for “normal” desktops? How to get parts of this going?
0
votes
1answer
205 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 ...
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 ...
0
votes
1answer
373 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 ...
0
votes
0answers
307 views

How to enable ambient light sensor function key on HP Elitebook 8460p?

The ambient light sensor is not enabled by default, but even when enabled, the function key does nothing. Is there a way to fix this so that the key turns it on and off?
0
votes
2answers
175 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 ...
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 ...
1
vote
0answers
84 views

Ubuntu isn't able to boot: Keyboard backlight function in Sony vaio

I have installed Ubuntu 12.04.5 alongside with Windows 7 and it's been working fine until yesterday. After choosing Ubuntu from the dual boot menu a message appears and says: "Sony Vaio: couldn't set ...
0
votes
0answers
128 views

Acer Aspire 4820t brightness fn-keys skip steps

My acer adjusts brightness 3 steps at a time. I've used solutions from: Why does my Thinkpad brightness control skip steps? I've disabled the video driver from adjusting brightness: sudo sh -c 'echo ...
1
vote
2answers
285 views

sudo is denied access to change keyboard backlight?

Opening vim as sudo -i or sudo - still doesn't let me write to the file. Trying to change the keyboard backlight settings on my laptop gives me this output; even with sudo I can't change anything in ...
0
votes
1answer
74 views

Where is the laptop brightness script located?

Online I found the command: echo 1 > /sys/class/backlight/acpi_video0/brightness to set my screen brightness to the lowest possible value, currently I am grepping my entire disk for that path, ...
1
vote
0answers
141 views

Apple Cinema LED Display: using regular brightness controls?

I have a Dell Latitude E6430 laptop, running Ubuntu 14.04, connected to a 27" Apple Cinema LED Display (which works fine). By tweaking the appledisplay kernel module a little bit, I can even get ...
0
votes
0answers
55 views

I can not install windown back. I get error message “cannot find backlight controller” “Support for cores revisions 0x17 and 0x18 disabled by module”

I tried to install ubuntu to my win8 pre installed computer and I am new at ubuntu so I chose lvm option while installing. and now ubuntu deleted all data about win8 and does not let me install ...