Questions tagged [brightness]

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Brightness Settings on my HP laptop do not work on Debian 11 (Bullseye)

Hi good day everyone I have an HP 15-n220ca laptop computer on my Debian 11 Bullseye operating system running LXQt, and I am having trouble to turn down the brightness on my laptop screen. It is all ...
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47 views

Can't Change Screen Brightness on Fedora on iMac

I installed Fedora Linux 35 on my iMac(21.5", Late 2009). It is working fine except that I can't control screen brightness neither through my keyboard(Apple's own keyboard) shortcuts nor the ...
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24 views

Screen brightness and HDMI not working on Ubuntu 16.04 AMD Ryzen 5 laptop

Mine is a Dell Inspiron 5000 series laptop with AMD Ryzen 5 processor. I am not being able to adjust my screen brightness on Ubuntu 16.04 LTS. Also it can't connect to external HDMI. I tried almost ...
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2 votes
2 answers
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Changing brightness only works after system resumes from sleep

I have a Lenovo Legion Slim 7 laptop (15ACH6) running Manjaro 21.2.3 on kernel 5.17. The problem I am facing is that on a clean boot, I cannot change the system brightness (using Fn keys or changing ...
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Dell XPS 9360 FN brightness keys not detected Manjaro

I have Manjaro installed in dual boot on a Dell XPS 9360 with FHD screen non touchscreen. The key combo to increase/decrease the screen brightness are Fn+F11 and Fn+F12. This works perfectly on ...
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2 answers
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How do I "get write permission for device files" in Linux?

I have just install brightnessctl to control my screen brightness, but can only run it as root. Doing otherwise prints the suggestion I "get write permission for device files". What is the ...
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1 vote
1 answer
202 views

KDE Plasma changes brightness on wrong GPU

I am able to change brightness manually by issuing the command: echo 512 | sudo tee - /sys/class/backlight/intel_backlight/brightness This changes the brightness output of my Intel integrated GPU on ...
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1 answer
64 views

Autokey - Adjusting Screen Brightness with Hotkeys (and sustaining that brightness in Awesome Window Manager)

In awesome window manager, my screen brightness gets reset to 100% each time I'm away from my computer for a few minutes. How can I get it to sustain the brightness I set prior to these screen-saver/...
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Use the multimedia keys on external usb keyboard to change brightness of laptop screen

I have Linux Mint 20.2 on an HP Elitebook laptop, and everything works fine. In particular, I am able to use the onboard keyboard keys to change the brightness of the screen. Now I will use an ...
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Debian: Brightness control does not work

I have just installed Debian on my Acer Aspire laptop; it has a Ryzen 5 CPU and a Radeon Vega AMD card. All is going pretty much fine, only problem is I can't change the screen brightness! I have ...
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2 answers
108 views

Awesome Doesn't Know My Brightness Ajustment Buttons

After installing Awesome (with no other GUI environments), the function keys on my laptop (for brightness especially), don't work like they do when I install KDE or GNOME. So far, the only method I've ...
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Applet to Control Brightness on Each Monitor

Using Awesome, I'm looking for a system tray applet that can control the brightness of each monitor. Using apt search I found a package called budgie-brightness-controller-applet, which was intended ...
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Manjaro brightness control not working

The brightness controller shows the level of brightness but i am unable to modify it. I have installed light and it worked but i want to change the brightness from the original keys. i have reviewed ...
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1 answer
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How to subscribe to screen dim event on linux

I have a script which corrects my screen brightness based on an ambient light sensor. I want it to stop changing my screen brightness when my screen dims as a result of user inactivity. How can I ...
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Ubuntu 21.10 on HPProbook 430 - Some keys cause brightness to dim

I cloned the hard drive from my previous HP notebook to a news one and upgraded ubuntu to 21.20. Now, everything works, but arrow keys and Win key cause the brightess of my screen to dim - like if i ...
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2 votes
1 answer
114 views

Script to increase/decrease brightness

My keyboard doesn't have the Fn key also on Openbox I am not sure if that works. I can use: # Default 1 ignores monitor setting, allows increasing a lot. <br> xrandr --output DP-2 --brightness 0....
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Problems with brightness media buttons

While setting up hotkeys in my window manager I find out that if I would press the brightnessup\brightnessdown button(which changes brightness as it should) and after that go to terminal, pressing '...
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1 vote
1 answer
672 views

Remap backlight/brightness to other keys on XFCE

I have a laptop with Manjaro XFCE and I damaged my F2 and F3 keys, which operate the brightness of the display (up and down respectively) while holding the Fn key. The xfce-power-manager works fine, ...
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Manjaro linux on Lenovo yoga S740: Brightness control keys are not sending anything

I have fresh installation of Manjaro linux on Lenovo yoga S740. Everything works except for brightness control. I tried to run xbindkeys --key and every other key works except brightness up and ...
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1 vote
0 answers
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External monitors and backlight control of internal monitor don't work with ThinkPad E14 Gen 3 (AMD Ryzen 5500U)

I have installed a Debian Sid with kernel version 5.10.0-7-amd64 on my new ThinkPad device. When I connect external monitors via the Lenovo USB-C dock or even the internal HDMI socket, they are not ...
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2 answers
290 views

Linux Mint on Lenovo E14 brightness cannot be adjusted

I'm new to this world. So the F5/F6 function keys basically don't work. I tried a few online solutions regarding changing grub, no luck. I found out that there is no file in /sys/class/backlight/, no ...
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Brightness and volume key bindings not working in dwm

I'm trying to get my volume and brrightness keys to work using dwm. I put this into dwm/config.h: static const char *upvol[] = {"/usr/bin/pactl", "set-sink-volume", "0", &...
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1 vote
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Can't adjust laptop screen brightness on Ubuntu 20.10 equivalent

I'm dual-booting a laptop (Dell Precision 7550) between Windows 10 and pop!_os 20.10, equivalent to Ubuntu 20.10. I have an issue regarding screen brightness. The laptop is stuck at a certain mellow ...
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3 votes
1 answer
803 views

Brightness Issue, Lenovo, Fedora 33

I'm having the brightness issue, where screen brightness doesn't change, on a Lenovo Legion Y740 with Fedora 33 that I haven't been able to solve yet. Here's the output of lspci | grep VGA: 00:02.0 ...
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Brightness only changes after reboot on 2020 Dell XPS 13 running KDE Neon 5.20

I am running KDE Neon 5.20 on a 2020 Dell XPS 13. In /etc/default/grub I have acpi_backlight=vendor for GRUB_CMDLINE_LINUX_DEFAULT, because for any other setting I get nothing in /sys/class/backlight. ...
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3 votes
2 answers
610 views

How to write a script that edits brightness file in /sys/class/backlight/ideapad/?

I am using i3 wm and I've got my brightness file in /sys/class/backlight/ideapad/brightness. ╰─$ ls -la /sys/class/backlight/ideapad/ -rw-r--r-- 1 root root 4096 Dec 18 16:55 brightness When I want ...
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-1 votes
1 answer
64 views

Brightness control

I am using Asus ROG laptop with ubuntu installed, I am not able to change my brightness from keyboard(fn+down arrow).However I have option to change from the GUI. Can someone help me please? Thanks in ...
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7 votes
2 answers
5k views

Backlight control not working on Lenovo IdeaPad Gaming 3 with Renoir / AMDGPU

The brightness (LCD backlight) controls on a Lenovo IdeaPad Gaming 3 (15ARH05, LCD display, AMD Renoir CPU Ryzen 5 4600H, discrete NVIDIA GeForce 1650 Ti Mobile) are not working: Fn keys show the ...
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1 vote
1 answer
86 views

Brightness can only go 1 level lower/higher on Fedora 32

First, I have to say that I'm completely new to linux and Fedora. So, please tell me the steps needed if you need more details. The problem is like this: I'm on max brightness and then lower it by 1 ...
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0 votes
1 answer
263 views

Can't detect monitor brightness keys in Wayland, but they are detected in X

I'm trying to slowly shift my way towards Wayland, but I'm having some trouble with my laptop's media keys. On X, all the ones I need are supported no problem, but when I switch over to Sway, I'm not ...
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1 vote
0 answers
152 views

Redshift prevents manual backlight adjustment (LXQt)

Redshift seems to work fine, dimming my screen with the red tint at night, but when Redshift is running (whether actively enabled or not) I cannot control laptop brightness with the laptop brightness ...
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3 votes
0 answers
97 views

Brightness automatically getting changed

I am using ‘xrandr —output —brightness 0.7’ in Kali Linux to control brightness and its working cool but sometimes brightness is getting changed automatically and I am stuck here. Same happening in ...
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0 votes
1 answer
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Dim the screen using software instead of hardware in Ubuntu 20.04

I have a Thinkpad P52 which has the issue of PWM flickering if the brightness is lowered using the hardware keys. I've tried installing Desktop Dimmer both via source and the deb package but it fails. ...
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0 votes
1 answer
646 views

How do I enable back-light controls without making my display flicker?

I am new to Linux and I am using Debian Testing with KDE Plasma installed during the installation process(i.e. tasksel). I had a problem with my brightness controls (the Fn keys or the brightness ...
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2 votes
1 answer
1k views

Backlight adjustment controls not working

So, like many other users, I can't set the brightness of my laptop using Fn keys or the brightness controls on settings. I have tried all the solutions that I could fine but nothing happens. Updating ...
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1 vote
1 answer
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What does the exclamation mark mean in udev rule?

I'am trying to get the brightness control keys (fn + arrows) to work on Arch Linux x64. So, i get a look into udev rule for my integrated ps/2 laptop keyboard using udevadm info: P: /devices/...
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0 votes
0 answers
472 views

Brightness keys not recognized

I use use an HP Elitebook 840 G6 with Arch linux, and it seems that the brightness keys are not recognized. I can change the brightness by writing to /sys/class/backlight/..., so the problem really ...
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0 votes
1 answer
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Can't find brightness controls in Linux Mint

I installed Linux Mint recently and then installed Nvidia drivers on my machine. There doesn't seem to be any brightness controls and the brightness keys arent working also. This happened after I ...
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1 vote
0 answers
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Unable to change brightness on fedora 31

I recently bought a Lenovo y7000. I have installed fedora 31 and configured the nvidia drivers for it also. Everything works fine but my brightness is stuck at maximum. I cannot change it via the ...
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2 votes
5 answers
4k views

Why doesn't Linux support OLED screens brightness control?

AFAIK, currently, all laptop OLED screens are Samsung screens, and they all use Pulse-Width Modulation (PWM) to adjust brightness. Windows support this feature, while Linux doesn't... Where should ...
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1 vote
0 answers
649 views

Resetting Display brightness/gamma on external Display doesn't work

I managed to mess up the output on my external Display. I don't know how, exactly. I am running Pop OS and recently upgraded to 19.10. Shortly after I noticed the problem that the display settings on ...
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5 votes
2 answers
2k views

Adjust backlight via DDC?

I'm looking for a simple way of adjusting an external monitor's backlight using DDC. Something like good-ddc-tool --monitor 0 --backlight 100 that just works without complicating things when a single ...
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1 vote
0 answers
411 views

HP Pavilion gaming laptop: Accellerometer, lid closure, and constant fan throttling

I've recently been forced to upgrade laptops after an unexpected deluge killed my last one. My wife, who plans for everything, managed to score an upgrade to an HP Pavilion 15 gaming laptop, and the ...
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0 votes
1 answer
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my display brightness is dimming automaticly

i just installed the proprietary nividia-beta drivers in arch, and my brightness is changing depending on the background, black = too dark white = too bright Im using arch linux and xfce on a GTX ...
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0 votes
1 answer
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Linux alternative to Microsoft Basic Display Driver

I am having issues with my brightness working on my laptop (stuck on max brightness); it uses the Intel HD 4000 graphics driver, however I had similar issues with it when I was using Windows 10, I ...
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2 votes
0 answers
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After replacing the screen, the maximum brightness lower than it used to be

I have a Dell XPS 13 9360. I had to replace the screen (which means: I had to replace the entire top half of my laptop...) since I cracked that by mistake... Of course, the new screen is original and ...
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0 votes
1 answer
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Im having brightness issue and need clarification on a possible fix

Hello i have been using Linux for two years so im still new to the whole community. please forgive me in advanced if this question is stupid and/or in the wrong forum. I have a laptop this ...
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1 vote
0 answers
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Brightness with iMac12.1

First of I know this might be considered a duplicate question, but the answers given on the other questions did not help. So i've tried about every Debain and Arch based distro, and now settled on ...
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15 votes
8 answers
50k views

Control screen brightness in i3

I would like to control the screen brightness in i3, in Intel laptops that come with Fn keys for the purpose. These keys function with any other DE. First making sure devices available are Intel: $ ...
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0 votes
1 answer
80 views

How to reset all brightness modifications?

I have followed many instructions in the past and now things are bad. Like: Suppose if I sleep and wake up my laptop, I have to toggle the brightness again in order to make my PC realize what was my ...
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