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

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Display still reset to minimum after restarting in ubuntu 14.04

I already follow these instructions provided in Ubuntu StackExchange and display is still reset to minimum after restarting. 1- cat /sys/class/backlight/acpi_videoX/brightness gksu gedit ...
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6 views

Cannot adjust brightness on Samsung NP370R5E-A06UK running Ubuntu 15.04

The issue is in the title. I have tried this as well as the top answer here, both achieved nothing. I should note however, that if I start up (or wake up from sleep) while not plugged in, I will get ...
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1answer
15 views

how to change ubuntu brightness?

i have repeatedly found it very difficult on desktops. echo 40 > /sys/class/backlight/ doesn't work as there are no backlight files. in laptop too sometimes there are not there but fn key works! so ...
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1answer
31 views

Adjust screen backlight on ancient HP, with Lubuntu 15.10

I've installed Lubuntu 15.10 on my HP nx9005 (circa 2001), and all works great except that I can find no way to adjust the backlight brightness. I've had a look at various solutions, here and ...
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0answers
13 views

Sony VAIO SVF1521 Not turn off keyboard backlight

I use ubuntu 15.10. My sony SVF1521JSTB hasn't got kbd_bakclight file in "/sys/devices/platform/sony-laptop/" path, and when I try run as root this "echo 0 | sudo tee /sys/.../kbd_backlight" command, ...
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1answer
269 views

15.10 Brightness adjustment

I have a 2015 Thinkpad X1 Carbon that I just installed Ubuntu 15.10 on. I have noticed that there is a huge jump between the minimum screen brightness, where the backlight is completely off, to the ...
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1answer
22 views

Laptop screen brightness change seems to affect color, not backlight

I have a problem with my laptop (Acer Aspire 5750G), I can't change the screen brightness. I noticed that the only application with which I was able to change the brightness of my laptop screen is ...
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0answers
16 views

How to turn off keyboard backlight if keyboard is broken?

My keyboard had the backlight on when it stopped working (due to spillage) and now I can't use the Fn + space to shut it off. Are there any commands or settings I can use without using the laptop ...
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1answer
25 views

Backlight controle is not working

i recently updatet my laptop to ubuntu 15.04 and my backlightcontrole is not working with the fn keys i tried a few things but it did not worked out for me. hp pavilion dv6 01:00.0 VGA compatible ...
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1answer
154 views

xbacklight: No outputs have backlight property - No /sys/class/backlight folder

I installed xbacklight, hoping that it would be able to control my brightness. When trying to change brightness, I was told "No outputs have backlight property". After looking around, I found that ...
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0answers
64 views

Hotkeys and slider for brightness don't work

I have an Intel processor with no graphics and Nvidia GTX980M with Nvidia driver. I just installed Ubuntu Gnome 15.10 and everything works fine except for the brightness controls. Changing both from ...
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0answers
56 views

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
71 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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61 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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34 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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0answers
57 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
74 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
30 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 ...
0
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1answer
75 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
99 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 ...
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0answers
41 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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0answers
69 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
682 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
28 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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17 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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209 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 ...
0
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1answer
36 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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0answers
162 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 ...
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0answers
187 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
99 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
323 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
202 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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0answers
51 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 ...
2
votes
1answer
172 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 ...
2
votes
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 ...
0
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2answers
801 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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94 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
276 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
87 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
154 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 ...
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votes
1answer
42 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
75 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
18 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
138 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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0answers
267 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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0answers
90 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
70 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
124 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 ...