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

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Nvidia 410m - No backlight

I've been running Ubuntu 14.04 on my laptop, a Sony Vaio VCGEP33F, but a few days ago I began using Nvidia drivers (331.79) This laptop also has an Intel integrated GPU, but I have disabled it in the ...
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1answer
391 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 ...
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1answer
139 views

Preserve screen backlight intensity over sleep

I am running Kubuntu 14.04 on my MacBook Pro Retina 13" (MacBookPro10,2) with integrated Intel graphics, and no other graphics chips. Currently, when I put my machine to sleep and later wake it up ...
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0answers
198 views

Keyboard Backlight not working

I'm using Ubuntu 12.04 on a Toshiba Satellite P775-S7100. The keyboard backlight was working initially, but after reinstalling the same version of Ubuntu it stopped working, and as far as I can tell, ...
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5answers
9k 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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2answers
402 views

Brightness keys no longer work

My Fn+F8 and Fn+F9 keys to change the screen's brightness appear to no longer work on my Thinkpad laptop. # ls /sys/class/backlight/ thinkpad_screen Some guide told me to make this: # cat ...
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0answers
214 views

Keyboard backlight only stays on in a light environment

So on my ASUS laptop (Q501LA), I can adjust the keyboard backlight with the hotkeys just fine, but the backlight seems to behave opposite to what you would expect - in a dark environment (like a room ...
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0answers
76 views

samsung np350u2b screen brightness out of control after 14.04 do-release-upgrade

I have upgraded 13.10 to 14.04 on my samsung np350u2b notebook. everything works fine except that when I put the notebook into standby then powerup again, screen backlight becomes darker and I cannot ...
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2answers
187 views

Macbook starts with the screen on minimum brightness

I have a Macbook2,1 with Ubuntu 12.04. When I start the computer the back light is on and I can see all of the boot stuff. Once the GUI begins to start up the backlight is turned completely off and I ...
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1answer
497 views

Ubuntu 14.04LTS hangs when i change brightness of my display on Dell N5010 laptop

I have dell n5010 my system hang when I try to change brightness of the display and this happen only when my system on battery please help how to solve this problem
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vote
1answer
223 views

Pixel Qi screen on ubuntu

I just installed Pixel Qi screen (PQ101WX01), but I can only control dimming of the screen. It doesn't become more readable in the sunlight. And if I go to sleep, screen becomes completely black. How ...
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votes
1answer
447 views

How to recognize backlit of an Asus UX31E keyboard?

I replaced the keyboard in my Asus UX31E with one from later UX31A. The only technical difference between the two is that the latter has keyboard backlight and uses Fn + F3 / F4 for this. However, I ...
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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 ...
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0answers
288 views

Backlight button not working ( Dell inspiron 14z) - 14.04

The main point is that everything was working on 12.04 but now I can only change brightness using the applet. Here's what I have done so far: Following the info provided on Ubuntu Wiki Backlight I ...
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2answers
528 views

Brightness controls mismatch

This seems to be a hardware issue rather than a Ubuntu issue, but nevertheless, here goes. I have an Acer ao756-2617 with Ubuntu 14.04, elementary os luna, bodhi linux, and zorin os 8. most of these ...
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1answer
204 views

Brightness Save on Reboot

I have a problem where the brightness does not save after a reboot on 14.04 LTS, but I had the same problem on 12.04 LTS (before I broke the system). Before you say this is a duplicate of a million ...
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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 ...
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1answer
148 views

Suspend not working due to backlight issue

I am using the Radeon HD 6320 video card with the radeon xorg driver. I have tried using the flgrx dirver but it isn't as snappy as the xorg and also has brightness issues. The xorg driver has ...
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1answer
110 views

How to find backlight is managed by which card?

Is there any command in ubuntu/linux which can help me in finding out that which card(intel or ATI card) is managing my backlight? When I looked at sys/class/backlight then I am able to find three ...
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2answers
296 views

How to fix backlight for Dell inspiron on ubuntu 12.0.4 LTS?

I work on a Dell Inspiron laptop. The backlight is not working on Ubuntu. Is there any known issues like this with Ubuntu on Dell machines? I've tried some solutions such as changing grub like the ...
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0answers
36 views

Ubuntu 12.04 boots to blank screen without backlight after upgrade on ASUS A72J [duplicate]

I had a working version of Ubuntu 12.04 in dual boot with Windows 7 on my ASUS A72J. However, after installing the last ~350 upgrades (I had not used Ubuntu in a long time) using the normal updating ...
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1answer
180 views

Keyboard backlight

I have a Samsung Series 7 NP700Z5AH with keyboard backlight. After Ubuntu install it doesnt work, is it possible to fix? There was a "Fucntion" shortcut for the sharpness of the light FN+F9/F10.
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1answer
2k views

Toshiba Satellite P755-S5269 keyboard backlight doesn't work

I'm new to Ubuntu and I have a problem with the keyboard backlight on my laptop. I was looking for solutions on the web but unfortunately I could not find anything specific. My laptop model is ...
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1answer
553 views

How do I adjust screen brightness / backight on a Toshiba Satellite C50D?

I know this is a known bug, it been asked and answered thousands of times before. I've spent the past couple of months searching for a solution and all have failed. My Fn keys won't adjust brightness ...
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1answer
135 views

no display backlight after boot on my notebook

i insttalled ubuntu 13.10 on my COMPAQ PRESARIO CQ-41 209TU notebook.but whenever it comes on login screen, display backlight turns to 0.why?please help me.
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1answer
430 views

How can control my brightness of the display on hp nseries laptop

I just bought a new laptop and i have installed windows 8 and ubuntu 12.04 on it. And while using ubuntu i am not able to control my brightness with the dedicated keys or the softwares such as ...
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1answer
105 views

Blender causes my screen backlights to flicker

I am using a desktop with a Radeon HD 5xxx CGU. Every time I work with Blender (no matter the version), my screen flickers at what seems to be random times (meaning I don't feel I am doing anything ...
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2answers
440 views

Toshiba T110 brightness control “FN” doesn't work (Ubuntu 12.04 LTS 32 bit)

I recently installed Ubuntu 12.04 32 bit in my Toshiba T110 laptop, and the brightness control doesn't work. I have tried gedit /etc/default/grub, and have modified the "quite splash" to many ...
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0answers
825 views

Backlight Controls Acer Aspire v5-572G

I know there are already a lot of similar questions regarding issues with no back light control with Acer models. I'm not having that issue anymore I followed the necessary changes needed in ...
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1answer
202 views

How can I force the backlight to never turn off?

I'm using Ubuntu 13.10 with GNOME 3.10 on a Packard Bell EasyNote-TK37 (Intel GM45 Express graphics), and I've had significant problems with my backlight. Initially, upon booting the backlight would ...
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votes
2answers
18k views

Enable the keyboard backlights on supported Lenovo (e.g. Carbon X1) with command

Some Lenovo laptops have keyboard backlights, and they can be turned on using Fn + Space. There are three states: off, normal and bright. When I start Ubuntu, these laptops always default back to a ...
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1answer
3k views

Xubuntu 13.10 Screen Brightness Fn Keys

I have a Samsung Series 9 NP900X3C, which has a Intel HD Graphics 4000 chip. When I use the the Fn keys for changing the brightness, it shows me a nice OSD and sets the value in ...
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2answers
929 views

Keyboard backlight function keys for Samsung Series 9 np900x3d and Ubuntu 13.10

I purchased a new Samsung New Series 9 NP900X3D and installed Ubuntu 13.10 tonight. The keyboard illumination function keys do not work. I've read on https://help.ubuntu.com/community/SamsungSeries9 ...
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votes
1answer
2k views

Start asus laptop UX32VD with keyboard backlight off

I'd like a way to set the default keyboard backlight state to "off". I'm running Ubuntu 13.04 on an Asus Zenbook UX32VD. All the function keys work, but currently I have to turn off the keyboard ...
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votes
2answers
3k views

13.10 Can't Adjust Dell Laptop Backlight

I have a Dell Studio 1558. When I originally installed 13.04 on it, I had to modify my /etc/default/grub with the following: GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=vendor dell_laptop.backlight=0 ...
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0answers
617 views

No laptop backlight when using AMD driver recommended by Steam

When I install the fglrx-experimental-13 driver that Steam recommends for my laptop (ATI Mobility Radeon HD 5000 Series) I have no backlight when I log in, but an external monitor works. I've tried a ...
3
votes
2answers
3k views

Screen backlight problem Ubuntu 13.04 Lenovo G700

I have installed Ubuntu 13.04 on Lenovo G700 Laptop. Screen backlight is going off after boot. I have tried to fix it with setting GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor" in ...
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0answers
585 views

FN brightness keys only has 3 steps on laptop with nVidia Optimus

First, I'm a noob at linux. I've tried about everything to fix this but nothing seems to work. My FN keys for the backlight only has 3 steps - either its maximum, medium or minumum. ls ...
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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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0answers
101 views

VLC does not prevent backlight from turning off on battery

On Kubuntu 12.04 i have noticed that VLC does not prevent my backlight from dimming when watching a movie in fullscreen on battery. I have the following enabled in the advanced preferences: Inhibit ...
0
votes
1answer
275 views

Backlight controls stop working once X starts

I'm using a Lenovo Thinkpad X120e with Ubuntu 12.04 LTS 64-bit and a Gnome 3.4 (gnome-shell) desktop environment. I have installed the latest proprietary AMD drivers (From their website) for the AMD ...
0
votes
1answer
793 views

Disable keyboard backlight on Sony Vaio S series (2012) (Ubuntu 13.04)

Basically I'd like to disable the keyboard backlight which at the moment is always on, on my Sony Vaio S15 (2012 series). I've read a few responses in the past which want me to look for the ...
0
votes
1answer
852 views

How to hotkey the brightness settings

I want to hotkey certain often used brightness settings under ctrl+ F7 through F10. I can already change it with the therminal. To be able to do this I ran the following command chmod 666 ...
0
votes
1answer
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
votes
1answer
1k views

Backlight adjustment not working in Lenovo IdeaPad Y580

I installed Ubuntu 13.04 on my Y580, and I added the acpi_backlight=vendor option to the bootloader. The OS boots without the black screen now, but I can't adjust the brightness with Fn+Up/Down keys. ...
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votes
1answer
147 views

writing a script, making it executable then assigning it keys

I have a Samsung np700z5a and have managed to get most features working but would love to get the keyboard backlight keys working. I have tried several methods including through the terminal. I have ...
0
votes
1answer
363 views

How can I avoid maximum brightness settings upon every boot?

Whenever I boot Ubuntu the display and keyboard brightness are reset to maximum. Since I almost never need such high brightness settings, every boot includes an aftermath of excessive key pressing. ...
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0answers
332 views

How do I turn off the display (DPMS) without X?

I've been trying to switch off the built-in screen of a device I've got, but I can't seem to completely control it without X running. If I run a GUI (I've tried Kubuntu 12.10) and issue the command ...
2
votes
1answer
673 views

LCD backlight keys on Fujitsu Siemens Amilo Pro

I have a FS Amilo Pro V3505, which runs 12.04 fine, apart from an anomoly with the brightness. The function keys (Fn-F8 & Fn-F9) both control the LCD brightness as you would expect. However only ...
2
votes
1answer
170 views

Console: switching off a built-in backlight

I'm trying to find out how to power off the backlight in a device I'm using with a built-in screen. I believe that DPMS works with the screen, but X is not installed, so I can't use xset. I thought ...