Questions tagged as ['brightness']

Questions related to screen brightness.
Score: 0
Brightness control not working on Legion 5 (Ryzen 5800H + RTX 3050 Ti)
de flag

Just loaded up Ubuntu 20.04 on this laptop. Everything's working perfectly, except for brightness control.

I've been following all the advice I can over at this thread: Legion 5 pro brightness control doesn't work on ubuntu 20.04 with nvidia driver 460

...but, nothing works for me. I haven't been able to find a single mention of a solution for the specific model I have anywhere on the internet. Again ...

Score: 1
Mr. rk avatar
Gnome brightness slider not working (Ubuntu 20:04.3 LTS)
id flag

The slider on top right for brightness does not work but volume and microphone sliders do work. As a temporary workaround, xrandr can set brightness and a shell script is about as convenient as using the slider. The script is below and should be used as ./ 0.5 where 0.5 is the brightness you want to set it to. 1 is maximum and 0 is minimum.


# Sets brightness on scale of 0 to 1
x ...
Score: 0
egc avatar
Ubuntu 21.04 nvidia brightness control
sn flag

I have MacBookAir 3,2 (2010) that works surprisingly well with Ubuntu 21.04 (GNOME), when its NVidia driver is correctly enabled.

The problem comes when controlling the screen brightness. The default hotkeys work, xbacklight and nvidia-settings -a BacklightBrightness=## both work, but the brightness setting set through any of these means does not persist between reboots or shutdowns.

From a few simi ...

Score: 0
Roshin Raphel avatar
Brightness goes to max while watching youtube after setting it to a lower values using xrandr in Ubuntu
cn flag

I changed my brightness to a particular value using xrandr. But when when I start playing a youtube video, it goes to max automatically. This only happens the first time. The command I used is

xrandr --output eDP --brightness 0.6

I am using Ubuntu 20.0.4 LTS.

Score: 0
wrong AMD GPU installation in Ubuntu default setting
cn flag

I had Dell precision 3510 with FirePro W5130M AMD graphic card. After installing Ubuntu, My login sometime gives my black screen instead of login. the screen is hesitate when it display a white color (bright increase and decrease). I used the commend


and this appear:

01:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Cape Verde PRO / Venus LE / Tropo PRO-L [Radeon HD 8830M / ...
Score: 0
ntg avatar
Brightness and sound not working after downgrading to 18.04 from 20.04 on dell latitude 3420 intel iris graphics
mx flag

I have received my laptop(dell latitude 3420) pre-installed with ubuntu 20.04, as there is a personal requirement I have removed 20.04 and installed 18.04. After installing 18.04 I found sound is not working(at output it is showing dummy output and input is not being detected) and couldn't find brightness bar.

I have also updated the bios to recent bios provided by vendor. After finding few solut ...

Score: 0
How do I maintain permission across reboots for a script to write to `/sys/class/backlight/acpi_video0/brightness`?
ru flag

I wrote a script that lets me toggle my laptop screen's brightness (I run if from a hotkey bound by xbindkeys),
but it involves writing to /sys/class/backlight/acpi_video0/brightness.

For now, I've just been making it able to write to that file by doing
sudo chown $USER: /sys/class/backlight/acpi_video0/brightness
but that resets after every time I reboot the laptop,
so I need to rerun it before I can ...

Score: 0
Change hardware brightness of monitor on desktop installation
sj flag

I have ubuntu 20.04 installed on my desktop and want to change the hardware brightness. I can change the brightness with xrandr but this does not change the hardware level brightness. Is there anyway to do this? I have tried both brightness-controller and xrandr so please do not suggest these.

The reason I want this feature is that I have a dual boot with windows. Changing the brightness on window ...

Score: 0
Dhananjay Borwankar avatar
Nvidia/AMD Driver's and Brightness using Fn + F2/F3 on Ubuntu 20.04.03 i3-wm
in flag

I recently bought HP Pavilion with 5600h and GTX 1650, I installed Ubuntu 20.04.3 LTS with minimal Iso. I am having Nvidia Driver's issue along with this Brightness issue. It's stays at 100%. I also don't know if AMD inbuilt graphic drivers are installed or not. I installed the minimal Iso with i3-wm and pcmanfm xinit xorg software-properties-gtk(tried installing drivers from here, it installs but then  ...

Score: 0
mrjinks avatar
brightness control with ddcci and gnome slider
cn flag

I have connected an external touch to my mini pc. DDCCI module seems to work for me.


echo 90 > /sys/class/backlight/ddcci5/brightness

results in a change of brightness. But unfortunately I cannot use the slider. The slider still controls intel_backlight. How can I change the slider to ddcci5? Is there a way to suppress the intel device to be populated during startup? acpi_brightness=none didn't  ...

Score: 1
asabhish avatar
Screen Brightness reset issue
nr flag

I have a brand new lenovo 5 pro laptop with Windows 10 + Ubuntu 20.04 dual boot installation, and I am facing a weird issue. Every time my screen sleeps and locks due to inactivity, and when I unlock it again, the screen brightness resets to maximum. When I move the brightness slider, the brightness adjusts to the corresponding level of the slider. This only happens during screen sleep, lock and unlock  ...

Score: 0
Cybermade avatar
Gsd-color disable
mw flag

Is it possible to disable the gsd-colorprocess please ? this process keeps resetting my brightness with xrandr and i want to disable it on startup tried this :

  1. -- How-to -- The GNOME Settings Daemon's color plugin auto-start on/off switch is hidden by default. To make it visible:
  2. Open Terminal and type: sudo sed -i "s/NoDisplay=true/NoDisplay=false/g" /etc/xdg/autostart/.desktop ~/.config/autostart/ ...
Score: 0
In dualboot ubuntu 20.04 is not detecting my system's bluetooth while in windows its working absolutely fine
us flag

I dual booted my system and install ubuntu 20.04, in ubuntu.... bluetooth not working, cant toggle on off switch button and brightness keys also not functioning while all these things working properly in window

s ss of bluetooth error

the picture shows the main problem of bluetooth.

Score: 0
Alex avatar
TeckNet mechanical keyboard lights not controllable
us flag

I've got a TeckNet mechanical keyboard with LED backlights, when I had the keyboard plugged into Windows, I was able to hold the function key down and turn the lights off, on, rotating etc. Also change the brightness.

I've plugged it into Ubuntu 21.04 and none of these features seem to work. The keyboard seems to be stuck on the rotating light scheme.

Does anyone know any way of managing the lightin ...

Score: 1
aaron roussel avatar
Problems with adjusting display brightness in Ubuntu 21.04 Samsung Galaxy Book Pro 360 13.3"
cn flag

Got a new laptop (Samsung Galaxy Book Pro 360) and i'm having issues with the display brightness not working. I've tried using software to control it as well as using the brightness control on the keyboard and nothing seems to work.

i tried adding GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor" to my grub file and updating grub then rebooting, did not work.

also tried doing that a ...

Score: 0
Davood Norouzi avatar
Ubuntu 20.04 brightness becomes ultra dark and not changing after suspend
br flag

I have a brand new Dell laptop with Intel Xeon processor. The brightness keys don't do anything but I manage to change the brightness using:

$xrandr --output eDP-1-1 --brightness 0.7

First of, how can I make the brightness keys to work?

Secondly, after I come out of the suspend mode, the display is ultra dark and I cannot change the brightness level. I can see that Ubuntu is back, but it is so dim, I c ...

Score: 0
Rick avatar
How do I prevent my laptop screen from dimming when charger is connected and disconnected? (Ubuntu 20.04.2 LTS)
cn flag

When I plug in or disconnect my charger from my laptop (Acer Inspire 7 N19C5), running Ubuntu 20.04.2 LTS, the brightness changes. I would like the brightness to stay the same when the power is connected or disconnected.

I read that changing this to false: org.gnome.settings-daemon.plugins.power idle-dim to false might help, but it's already set to false as I get this:

gsettings get org.gnome.settings-da ...
Score: 1
suhani avatar
Ubuntu 18.04, Lost control of brightness after grub crashes
in flag

I updated ubuntu version 16.04 to 18.04 on my Dell Vostro-3478 almost a year ago. Last few days, the screen was freezing again and again and i had to restart it each time. The grub crashed yesterday when i tried to connect the wifi. Somehow managed to log into system using rescue mode. But now, neither the F key(for brightness) nor the brightness control in system settings is working.

Although i  ...

Score: 1
Parker avatar
Brightness slider on top bar not working properly on laptop
us flag

I installed Ubuntu 20.04 a couple weeks ago on my Matebook D14 with a Ryzen 5 and I realized that every time I turn on my laptop my brightness slider is set on the lowest brightness setting, but my display is on the highest brightness possible. In here my brightness slider is set on the lowest but my display has the highest bright possible

Score: 0
Can't change brightness on Kubuntu
us flag

After a few days away from Linux, I now realise I'm suddenly unable to adjust the brightness, both via the Fn keys on my laptop as well as by changing brightness in the Energy Savings settings screen.

I've got Kubuntu 20.04 (LTS) with KDE Plasma 5.18.5. I have a Lenovo Legion laptop with NVIDIA GTX 1650.

I've done the usual round of Googling, and tried a few things including this and this, but noth ...

Score: 0
Dion Snoeijen avatar
Brightness control not working on Legion 5 Pro. Ubuntu 20.04.2 LTS
cn flag

I know I'm not the only one running into this issue. I have been following a lot of instructions on several posts here and elsewhere. I will sum up what I have tried to fix this.

First my system: Legion 5 Pro with a Nvidia RTX3070 on Ubuntu 20.04.2 LTS.

It was a real chore to get ubuntu running properly on this machine, mainly because of nvidia drivers. But it's alomost working now, except for the s ...

Score: 1
Black screen in recovery mode after adding xorg.conf.d file
cn flag

I’ve looked at a bunch of the existing questions about black screen and I don’t think this is a duplicate.

I have Ubuntu 18.04 installed on a Lenovo P52 ThinkPad.

I followed the instructions in this article to try to fix the screen brightness adjustment (which wasn’t working at all). Running ls /sys/class/backlight yielded nvidia_0. I then ran ls /usr/share/X11/xorg.conf.d which yielded sev ...

Score: 0
user7037 avatar
Unable to reduce screen brightness using Fn key in 20.04
tc flag

I have a

  • Lenovo P51 laptop
  • Ubuntu 20.04
  • Fn+F5 and Fn+F6 are the brightness up/down keys

Current behaviour:

  • Pressing Fn+F6 increases the brightness and shows the brightness meter OSD
  • But pressing Fn+F5 just shows a circle with a line through it(⊘) on the OSD
  • I can increase and decrease brightness using the slider in Power settings

Expected behaviour:

  • Pressing Fn+F5 should display the brightness OSD  ...
Score: 1
br3tt avatar
Brightness Keys Not Working on Lenovo Ideapad 5, Ubuntu 21.04
us flag

I have a Lenovo Ideapad 5 running Ubuntu 21.04. No matter what I do, the brightness keys do not work.

Output of neofetch:

OS: Ubuntu 21.04 x86_64 
Host: 82FG IdeaPad 5 15ITL05 
Kernel: 5.11.0-25-generic 
Uptime: 9 mins 
Packages: 2401 (dpkg), 11 (flatpak), 6 (snap) 
Shell: bash 5.1.4 
Resolution: 1920x1080 
DE: GNOME 40.3 
WM: Mutter 
WM Theme: Adwaita 
Theme: Orchis-dark [GTK2/3] 
Icons: Adwaita [GTK ...
Score: 2
Johnd avatar
Automatic brightness missing from settings in Ubuntu 20.04
ph flag

I'm running Ubuntu 20.04 on my Thinkpad T495s and I wanted to enable adaptive brightness. However, the automatic brightness is missing from my Settings/Power.
My Settings/Power

I tried to google and found this article which mentioned using
gsettings set org.gnome.settings-daemon.plugins.power ambient-enabled true
to enable automatic brightness but it doesn't seem to work.

Any ways to fix the system settings? I'm  ...

Score: 0
YQ002lc2 avatar
Ubuntu Server console brightness
cd flag

I'm familiar with

xrandr --output Monitor_name --brightness 0.6

for adjusting screen brightness in graphical environments.

Is there a similar tool to adjust brightness for ubuntu server's console?


Score: 2
Thul avatar
Laptop Ubuntu 21.04 brightness can't be adjusted
cn flag

I received my new laptop with Ubuntu 21.04 on it, Nvidia 3070 GPU and Ryzen 9 5000 series CPU (with internal GPU). Running kernel 5.11.0-25-generic. Gnome tries to render most things using the Ryzen GPU.

For some reason i am unable to change the brightness of the laptop screen. I do see the following backlight device /sys/class/backlight/amdgpu_bl0/ which changes to /sys/class/backlight/nvidia_0/

Score: 0
Anukaran Subedi avatar
Cannot change the brightness level even after changing from the setting
in flag

I am not able to increase or decrease the brightness level of my device. Even if i change the brightness level from the settings the brightness level doesn't change. I even tried the hot keys. They show the level of brightness chamging but the brightest and the dimmest is the same.

Score: 1
John Williams avatar
Ubuntu 20.04.2 Screen Dims Randomly
us flag

I have tried all relevant Settings choices, including "xset s off; xset s noblank; xset -dpms; xrandr --output HDMI-1 --brightness 1.0" as ordinary user and root, but the screen still dims itself occasionally at random. How can I permanently turn OFF screen dimming?

There must be some code in the Ubuntu installation to do this!

Maybe something in /etc?

Score: 0
Robothood avatar
Cannot set an xrandr script to run on login no matter what I have tried
ma flag

So basically I want this command to run whenever I log in. The command is xrandr --output HDMI-A-0 --brightness 0.90 --gamma 1.05:1.00:0.95 The things I did so far is to create .sh file and set the file to be executed via the startup setting but it didnt work. I tried to make it an application but again it didnt wokrk. Ive tried to make a .desktop file with the same results.

Its getting really frustrati ...