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

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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 ...
4
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1answer
358 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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65 views

My Toshiba Satellite P855-331 PSPKFE laptop's keyboard backlight is not working under Ubuntu 14.04

My Toshiba Satellite P855-331 PSPKFE backlit keyboard not working under Ubuntu 14.04. In BIOS and bootup it works but after Ubuntu boots, it is not working anymore. I have read similar threads of ...
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1answer
63 views

How to make suspend work without the screen staying black afterwards?

I recently installed Ubuntu 14.04 on my laptop, and whenever I try to resume my computer after suspending it, everything starts up fine except my screen, which remains black (no backlight). My laptop ...
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1answer
188 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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4answers
213 views

Backlight issues with Asus X551MAV-EB01-B

I've got a fresh install of trusty (xubuntu if that matters, I don't think it should) on a Asus X551MAV-EB01-B. My function keys for brightness don't work. Here's what I know so far: If I pass ...
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6answers
28k 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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1answer
122 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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0answers
145 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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1answer
464 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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1answer
50 views

Backlight keyboard won't turn on samsung ativbook 6 ubuntu 14.04

So I have recently installed Ubuntu 14.04 and I like it but I can't seem to make the back-light keyboard to work. I have search hours for a solution but I can't find the script: kbd_brightness ...
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4answers
698 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
19 views

kubuntu : backlight problem on vostro 3555 (radeon HD 6520G)

having recurrent trouble running (k)ubuntu on a dell vostro 3555 using a radeon hd 6520g chipset, i'd solved those on 13.10, re-installing the proprietary driver (because the resume on lid open and ...
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2answers
148 views

Keyboard light and screen brightness at 100% after startup

After every restart the default screen and keyboard light is at 100% and it is quite annoying. Is there a workaround for this?
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0answers
25 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
36 views

Xubuntu - How do I map the brightness keys to run a script?

I'm pretty new to Linux so bear with me. I have an emachines laptop (ugh) with FN + Left Arr / Right Arr brightness keys. These work perfectly fine in Windows but do not work in Xubuntu. What happens ...
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0answers
28 views

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

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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2answers
127 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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1answer
875 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 ...
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1answer
175 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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0answers
23 views

Keyboard Backlight Software [Novatech N1716]

I have a Novatech N1716 laptop: http://www.novatech.co.uk/products/laptops/n1716.html it comes with a windows driver disk (who would have thought), and now that I have switched to linux, I was ...
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4answers
23k views

How do I set default display brightness?

Is it possible to set the default display brightness so you don't have to re-adjust it everytime you reboot? My laptop display is killing my eyes at the login screen already because it starts at 100% ...
0
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1answer
27 views

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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0answers
35 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
84 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
67 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
2k views

Last couple of fglrx drivers on Ubuntu 12.04 have backlight support broken

I've been keeping up with latest fglrx releases on AMD's website and it appears that both the last stable (13.4) and beta (13.6) drivers have brightness broken in Ubuntu 12.04 with all the latest ...
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2answers
149 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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5answers
7k views

Backlight can't be turn on in Acer Aspire 4736

When I booted up my newly installed Ubuntu 11.04, I discovered, to my dismay, that the backlight was off by default. The keyboard shortcut (which is Fn+F6 on my Acer Aspire 4736) for turning on the ...
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1answer
200 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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1answer
54 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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0answers
87 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
38 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 ...
4
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1answer
184 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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0answers
23 views

backlight on laptop

My laptops backlight adjustment keys don't work on 13.10 and the "brightness and lock" ui doesn't work. I think it may have worked before installing nvidia drivers, but I don't remember. I've ...
0
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1answer
158 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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0answers
105 views

System crash: empty /sys/class/backlight (deleted acpi_video0) & now the error “disk drive is not ready yet or present”

I "tried" to set the default brightness for Ubuntu 14.04. Following here, At first I did: echo 5 > /sys/class/backlight/acpi_video0/brightness then: sudo apt-get install xbacklight then ...
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0answers
62 views

Keyboard Backlight Samsung Ativ 6

I have a Samsung Ativ 6, it's my first notebook, and I'm new with Ubuntu and having some problems ;P My keyboard backlight doesn't work, I've already made a big search and couldn't solve the problem. ...
0
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1answer
94 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 ...
0
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0answers
50 views

Turn on ThinkLight?

I have an old Lenovo ThinkPad R61. It is fully loaded and it has the the ThinkLight option. For me to be able to turn it on and do other things like adjust the brightness, I have to use the blue ...
1
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0answers
311 views

Touchpad/Backlight keys on Asus Transformer T300LA

I have Asus Transformer book T300. Almost all my hardware working perfectly on Ubuntu 13.10/14.04 Beta but my touchpad defined as Mouse and gestures not working :( I need this option. Touchpad ...
3
votes
1answer
92 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 ...
0
votes
0answers
201 views

Can't adjust screen brightness on lenova y410p

Can't adjust screen brightness on lenova y410p. I'm running unbutu 13.10. I tried different answers on here but nothing seems to work. I changed GRUB_CMDLINE_LINUX in /etc/default/grub to include ...
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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 ...
6
votes
4answers
2k views

Macbook Pro boots with full screen brightness and keyboard backlight

I have dual-booted my Macbook Pro with Ubuntu 12.04 . Whenever i log-in to Ubuntu, it does so with full screen brightness and keyboard backlight at full . How do i get rid of this? How can i tweak the ...
0
votes
1answer
824 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 ...
4
votes
2answers
730 views

How to increase the amount of steps of brightness adjustment-key

The screen of my laptop (Dell Vostro 3460) supports 16 levels of brightness: Not only according to the manufacturer, but also as is clear from two OSs: Both Windows 7 and Ubuntu (dual-booted) support ...
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1answer
117 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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3answers
2k views

Brightness Hotkeys Only Slightly Work

I just installed Precise on my Samsung Laptop (QX412-S01au, using Ubuntu 2D). The brightness hotkeys sort of work: Adjusting the brightness using the slider in the control panel works just fine ...
0
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0answers
210 views

Samsung NP900X3G issues on Ubuntu 12.04 ( keyboard backlight, multitouch…)

I recently got the newest member of the Samsung Ativ Book 9 Family NP900X3G and I'm having the same issues that have been reported for the previous models but none of the fixes worked for me. ...