Questions tagged [xbacklight]

xbacklight - adjust backlight brightness using RandR extension where supported

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Dell ACPI Backlight brightness doesn't change on 20.04

I have a Dell G3 3579 (Secure Boot Disabled) with Ubuntu 20.04 fully updated. The brightness cannot be changed in either the OS or with the hardware keyboard buttons. Here's what I tried: I ...
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0answers
27 views

xbacklight No outputs have backlight property

When I try running xbacklight -inc 10 I get an error message "No outputs have backlight property" I've searched the issue and found several answers usually suggesting some form of modifying /etc/X11/...
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0answers
31 views

xbacklight not working in Ubuntu 18

I'm trying hard to get xbacklight to work but when I type xbacklight -inc 20 for example, and press enter, It says nothing and nothing happens! Not even an error! I've tried this fix and it worked but ...
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0answers
105 views

Controlling brightness on Ubuntu 18.04 LTS

I'm not able to change my brightness with the keys nor do I have an option to change them. Also I have tried using xrandr and xbacklight commands.
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1answer
194 views

i3 not working with xbacklight

I'm not able to decrease or increase. This is current config for the screen brightness using xbacklight: bindsym XF86MonBrightnessUp exec xbacklight -inc 20 # increase screen brightness bindsym ...
2
votes
1answer
1k views

Cannot set brightness with xbacklight, Intel

This is similar to these two questions, but the solutions posted in each do not help me: xbacklight - No outputs have backlight property xbacklight: No outputs have backlight property - No /sys/class/...
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1answer
200 views

Can't find a way to set the brightness via the terminal

I recently started using a window manager (XMonad) and am enjoying it. The only issue is I have to reconfigure a lot of the the function keys (volume, brightness, etc) to do what they're supposed to ...
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1answer
701 views

Unable to lower brightness in lenovo legion y530

I have tried various methods found on the internet, including xbacklight . The main issue is I have no folder inside /sys/class/backlight. Usually others happnened to have a folder like ...
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0answers
88 views

Brightness changes are shown by the indicator but have no effect on the display (Lubuntu, Intel card)

I have tried many of the proposed solutions that I could find on the web, but any of them worked for me. I detail here my problem and some of the things that I tried: Relevant details: TOSHIBA NB200 ...
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1answer
3k views

How do I turn off backlight of keyboard?

I've tried xset led 3, xset led off, xbacklight -set 00, sudo find /sys/devices/platform/ -name leds returns nothing, so I couldn't try that. sudo find /sys/devices -name leds returns /sys/devices/...
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0answers
128 views

How to have xbacklight working in Kubuntu 16.04?

xbacklight worked perfectly in Kubuntu 14.04 but now in Kubuntu 16.04, even when it it installed, I only get this message: No outputs have backlight property In my system there is a /sys/class/...
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0answers
2k views

xbacklight -display XX?

I have two displays. I can successfully set brightness for the first display using e.g. xbacklight -set 30, but I cannot dim my second display connected to HDMI. I tried xbacklight -display HDMI1 -set ...
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0answers
283 views

I can't turn off backlight after trying many solutions

I have a Samsung N220 modified with a Pixel QI screen. For those of you who don't know Pixel Qi, they make normal LCDs that once the backlight is turned completely off they act as (kind of) e-ink ...
1
vote
2answers
5k views

Adjust brightness from Terminal [duplicate]

I'm trying to edit the brightness of my System76 laptop screen from my window manager i3wm. I've tried the following: xbacklight -dec 10 does nothing sudo vim /sys/class/backlight/intel_backlight/...
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2answers
8k views

i3wm, adjust brightness through command line

I've got a Precision 5510 running Ubuntu 16.10 with kernel 4.8.4. In unity, my function keys for brightness work correctly. But xbacklight commands don't do anything. xbacklight -get comes up empty. ...
1
vote
1answer
5k views

Xbacklight won't help to change brightness in lubuntu

I have an old acer laptop with following graphics hardware: 00:02.0 VGA compatible controller [0300]: Intel Corporation System Controller Hub (SCH Poulsbo) Graphics Controller [8086:8108] (rev 07) ...
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1answer
1k views

Install xbacklight on Ubuntu 15.04 [closed]

I am trying to install xbacklight using sudo apt-get install -y xbacklight but getting error related to mysql.After running above command a new window pop up to set password for mysql.But after ...
32
votes
3answers
85k 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 ...
0
votes
1answer
224 views

Cron job to set screen brightness not working in ubuntu 14.04

In the terminal, I ran: crontab -e Then I added the following cronjob in the file 26 21 * * * /usr/bin/xbacklight -set 80 This was supposed to set the brightness to 80% at 9:26 PM. But its not ...
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2answers
553 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 ...
3
votes
2answers
858 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 ...
2
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0answers
376 views

Mapping xbacklight to brightness keys?

The default method of changing the brightness doesn't work with the NVIDIA drivers, and xbacklight changes it. However, using the default mapper for keyboard shortcuts won't work for setting the F1 ...
0
votes
1answer
2k views

Reduce CPU frequency in battery mode automatically

Is there any way to do that? Something like xbacklight and Cuttlefish
1
vote
1answer
2k views

rc.local not executing command

I was trying to make my laptop running Ubuntu 13.10 remember the brightness from the last time and set it automatically on start-up. I was thinking about using xbacklight to set the brightness. So, as ...
0
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2answers
2k views

How to execute command with keys?

Like a lot of other users, I have problem with the brightness settings on my laptop. But there is xbacklight which works like a charm. How do I bind xbacklight -dec 10 to Fn+Up? I have tried to use ...
2
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2answers
829 views

Is it possible to run a command before log in screen?

How can I run: xbacklight -set 0 before login screen?
35
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6answers
53k views

How do I set default display brightness? [duplicate]

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% ...