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

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Lubuntu MacBook no screen backlight after resume/wake

I'm running Lubuntu 15.10 on a MacBook Intel Core2Duo. After suspending/hibernating and then resuming/waking the screen's backlight does not come on. With a bright enough light, one can see what the ...
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35 views

Change default brightness level in Ubuntu 14. 04 LTS / Brightness is reset to Maximum on every Restart on Ubuntu 14.04 LTS [duplicate]

Recently I was going through the link below (Brightness is reset to Maximum on every Restart) and was trying to change the default brightness level on my system as its very annoying as the default ...
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1answer
118 views

15.10 Dell Vostro 3700 display brightness fn+key change problem

I have 15.10 default install, no any changes to /etc/default/grub. Now when I press Fn + arrowUp/Down I can see display brightness change notification. Moreover, /sys/class/backlight/acpi_video0/* ...
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89 views

Strange problem with backlight (it worked and now no more?)

EDIT : It's started working again?! i went out on friday night and i left pc ON. This morning it was working. looking in syslog i saw this : Dec 10 22:41:00 LittleHP kernel: [ 262.553256] video ...
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64 views

Original MacBook Air Running 14.04 Won't Turn on Backlight after waking

I have the original MacBook Air running Ubuntu 14.04 (Which is running really well, except for one thing.) I seem to have everything working, except waking the computer from a lid close. After I ...
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78 views

Changes in system screen brightness aren't reflected on actual screen. [Ubuntu 15.10][Laptop]

I've had this issue since 14.04.3 but I never bothered to fix it since I didn't use Ubuntu much. Pressing the brightness up/down function keys brings up the popup displaying the brightness level, ...
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2answers
137 views

xbacklight works, system settings don't affect

I am running Ubuntu 15.10 x64 on my Dell M4800 with the lvds connected to the Nvidia K2100M via nvidia-355, as the intel card does not support the 3K screen. So when I change the screen brightness ...
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1answer
44 views

How to switch the screen illumination off and continue typing? [duplicate]

I can switch the screen illumination manually off by pressing Fn+F6 on my laptop keyboard. This is the same as automatically switching it off on idle as it can be set in the power management. The ...
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1answer
102 views

Ubuntu brightness max_level

Notebook is Lenovo IdeaPad Z500. Ubuntu 14.04 LTS with latest updates. When I first time clicked on F12 (which change brightness up by default) light become lower, but not 0 (I see the text, but it's ...
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1answer
239 views

Brightness Control : Asus X453MA : Xubuntu 14.04

I cannot adjust the screen brightness using the Fn keys. I have scoured the net to find a solution and so far this is what I have : I've tried creating/editing /usr/share/X11/xorg.conf.d/20-intel....
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43 views

Problem with backlight

I always have problems with brightness control in my computer,(I have intel graphics HD 400) Until yesterday, I was running ubuntu 15.04 without problem at all. I just have to modify grub with these ...
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72 views

Keyboard backlight keeps turning on after uprgade to Wily on Dell V131, what can be the cause? [duplicate]

I have a Dell V131 with and recently upgraded it to Ubuntu (15.10) Wily Werewolf. Now, the keyboard backlight keeps turning on. I have not seen it turn on and mostly notice when I come back to the ...
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2answers
1k views

Dell XPS 13 9343 - keyboard backlight on at boot Ubuntu 15.10

I upgrade from Ubuntu 15.04 to Ubuntu 15.10 and now on the first boot the keyboard backlight is on. I can manually turn it off, but the setting is not remembered and the next boot results in the ...
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0answers
43 views

How to install recognized backlight software on my Toshiba Tecra R850?

I'm running Ubuntu 14.04 on VirtualBox, which seems to have emulated graphics. I can adjust my brightness and have graphics drivers installed, but Calise doesn't recognise either. It wants sysfs ...
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23 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.
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241 views

Brightness Ubuntu vs. Kubuntu and Xubuntu

On Kubuntu and Xubuntu the brightness of my monitor goes down to zero (i.e. the backlight got switched off). On Ubuntu this does not happen, the minimux brightness is still with backlight on and ...
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1answer
67 views

Backlight does not come on after booting

I have a slightly old Gateway NV series laptop, and just installed Ubuntu 14.04 LTS because Windows was getting slow. Once it installed though, I found that the screen backlight does not come on after ...
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261 views

Samsung tools ubuntu 15.04

I know there is a samsung tools for ubuntu 14.04, but I am currently on ubuntu 15.04. Does anyone know of samsung tools working on ubuntu 15.04? I do not want to go through reintalling 14.04 for it. ...
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0answers
30 views

Ubuntu 14.04. Samsung Ativ Book 6. Brightness doesn't change [duplicate]

When I change my brightness, the slider moves, the brightness level changes, but actual brightness is the same. I have read a lot of topics about this problem. I tried to change grub, to create /usr/...
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297 views

Dell XPS 13 9343 keyboard backlight

I have just re-installed 15.04 after updating my older BIOS to a newer version, prior to this re-installation the keyboard back light was functional; however, it doesn't seem to be working anymore ...
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0answers
167 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 ...
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1answer
378 views

backlight trouble xubuntu lenovo ideapad 100

Brightness control is reversed. When I press the brightness control keys the increase button will make it dim and visa versa. The indicator for the brightness on display is also backwards, and before ...
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2answers
238 views

Is there an App that can make my desktop dimmer

I used an app in Windows 7, I think called dimmer to make the screen change its contrast settings so I could dim it lower than the controls of the PC defaults such as function key or the power options ...
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73 views

Ubuntu on Macbook 4,1 (pre-October 2008) Backlight Laptop Screen Issue

I cannot get Ubuntu or Ubuntu-based systems to wake from sleep properly on a Macbook 4,1 pre-October 2008. The backlight for the laptop screen does not turn back on after waking and signal does not ...
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1answer
231 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 ...
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0answers
27 views

Brightness slider is too fine (14.04)

I'm running ubuntu 14.04 on a Dell laptop (XPS 13 Developer Edition). The brightness slider stopped working (the slider would fill up and empty as usual but the brightness wouldn't change). This fix ...
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2answers
1k views

Can't change brightness of laptop in ubuntu 14.04 / 15.04

When i just try adjusting brightness, the indicator changes but the screen does not change brightness. I have tried adding acpi_backlight=vendor to my grub file and also doing echo x > sudo tee /...
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1answer
170 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 /sys/...
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1answer
404 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 ...
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0answers
124 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 ...
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1answer
233 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 /sys/class/...
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1answer
45 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 ...
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3answers
86 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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19 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 ...
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0answers
623 views

*ERROR* Cannot find a backlight controller

So I just updated my kernel version on Ubuntu 15.04 64bit to Kernel 4.1.6 latest mainline. Now every boot of my laptop, I got this error. starting version 219 _ ...screen blink... starting version ...
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122 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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1answer
4k 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 ...
2
votes
3answers
910 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
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1answer
535 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 ...
3
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0answers
2k 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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2answers
1k 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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1answer
2k 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
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1answer
543 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 ...
4
votes
1answer
330 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 ...
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189 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 http://store.hp.com/webapp/wcs/stores/servlet/us/en/mdp/...
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1answer
464 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
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1answer
268 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 ...
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votes
1answer
99 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 worked....
0
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1answer
717 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) ...
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0answers
166 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 ...