Questions tagged [backlight]

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

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Lenovo legion 7 16ACHg6 (2021) backlight brightness control problem

I have a Lenovo Legion 7 16ACHg6 (2021) which was only released recently. It has AMD 5800H with NVIDIA RTX 3060 GPU. One of the issues I found is that backlight brightness control is not working. I.e. ...
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Installing 20.04 Server on Laptop with failed GPU

I recently acquired a macbook pro 2015 with a bad GPU: it won't boot to pretty much anything, but if I use single user mode (which just has a terminal output) it doesn't crash. I was hoping I could ...
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Please help, no back light anymore. MacBook pro won't boot

Okay, a newbie here with a big problem. I installed Ubuntu 20.04 on my 2009 MacBook Pro. I am completely new to the world of Linux and have yet to discover everything. However, I could not dim the ...
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Keyboard backlight, HP laptop

Is there a way to control the keyboard backlight on a HP laptop in software? Of course there is the keypress (fn+F5 in this case, Pavilion), but that is a toggle. Also, the fn key is never exposed to ...
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Legion 5 pro brightness control doesn't work on ubuntu 20.04 with nvidia driver 460

My laptop seems to be on max brightness and the brightness control slider/Fn keys have no effect on the screen brightness except showing a pop-up notification of the slider. This problem isn't really ...
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Where is the Lubuntu default backlight icon stored?

I have recently installed Lubuntu and have everything working as I want, except for the backlight icon in the taskbar I have at the top of my screen. I can't work out where it is being sourced from. ...
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44 views

Changing brightness settings has no effect on Ubuntu 20.10

Note: This is not a duplicate of Ubuntu 20.04 brightness adjust not working, Cannot change brightness (Ubuntu 16.04 LTS and onward) or Unable to change brightness in settings because the answers do ...
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How to make a screen dim smoother/slower after a period of inactivity

I am running my laptop on Kubuntu 20.04 LTS. Of course, the system has the possibility to gradually dim the screen after a period of inactivity. However, this happens in abrupt steps, which, ...
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Set keyboard backlight to 100% at startup

I am trying to change the keyboard backlight level to 100% at startup and there are many answers here on AU and none of them have worked for me. The answer that comes closest is trying change the ...
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1answer
116 views

Trouble using function keys to change screen brightness, sleep and adjusting keyboard backlight on ROG Zephyrus G15 running Ubuntu 20.04 LTS

I installed Ubuntu 20.04 on my ASUS ROG Zephyrus G15. I am not able to use the following keyboard action keys shortcuts(Fn+Function keys): Screen brightness(Up:Fn+F7 / Down:Fn+F8) Keyboard backlight(...
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Change screen brightness increment

I am on a stock Ubuntu 20.04 LTS machine with gnome. Using the brightness controls on my keyboard ('fn' + left/right arrow keys), I can adjust the screen brightness up or down (this brings up a gnome-...
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1answer
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Configure Ubuntu 20.04 server on RPI4 to turn off external HDMI backlight after inactivity timeout

I've installed Ubuntu 20.04 server on an RPI4, and want to configure it to disable the external HDMI LCD monitor backlight after a certain amount of inactivity. Not simple screen blanking as shown in ...
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Keyboard backlight turns off when typing passward at login

I set the keyboard to be backlit using xset led on. But recently, at the lightdm login prompt when I start typing the password, the light goes dark. After I log in I can reissue the xset command at ...
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Keyboard backlight won't auto turn on after suspend

Recently I did a fresh install of Ubuntu 20.04 on a new laptop. Everything works fine. But strangely every time I resume the laptop after suspend the keyboard backlight won't turn on automatically, I ...
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Failed to start Load/Save Screen Backlight Brightness of backlight:acpi_video0

As what title shows, I see this message at the screen of booting system. [ OK ] Created slice system-systemd\x2dbacklight.slice. Starting Load/Save Screen Backlight Brightness of backlight:...
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Ubuntu 20.04 keyboard backlight problem on a 2017 Macbook after pCloudDrive install

Everything was working fairly well (sound card/wifi known issues excepted) until I installed pCloudDrive. Now my keyboard backlight will not work (minor issue in the grand scheme of things but it's ...
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Brightness key react very slowly in Acer Swift 3

Each time I press a brightness up or down key, it takes a while and then changes the backlight brightness and the kernel writes acer_wmi: Unknown function number - 4 - 0 Looking for a solution to ...
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1answer
202 views

Brightness control not working (lenovo + intel tiger lake + ubuntu 20.04)

I just got a new Lenovo with an Intel Core i3-1115G5 with integrated graphics. After a fresh install of Ubuntu 20.04 the Fn keys that are supposed to control the brightness do not work. The brightness ...
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2answers
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how to re-install zlib1g_1.2.11 from root access

First, writing from mobile as Ubuntu 18.04 LTS is failing to boot. I have access to 'root@user:~#' from the recovery menu. I have updated the backlight setting (systemctl mask systemd-backlight@...
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No backlight control with Fn keys on Xubuntu 20.04, Intel graphics

I run Xubuntu 20.04 on an HP Pavilion dv6 1375dx with kernel 5.4.0-54 (latest as of today). The graphics card, according to inxi -Gxx, is Graphics: Device-1: Intel Mobile 4 Series Integrated Graphics ...
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keyboard backlight Acer Nitro5 AN515-55 Ubuntu 20.10 works but 2 question

My Acer nitro5 AN5-15-55 laptop keyboard backlight is working , only red is available, (and I cannot adjust keyboard backlight brightness), but the back light 'sleeps' when I am not typing? I can't ...
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Lenovo Legion 5 15IMH05H brightness control problem

I have a Lenovo Legion 5 15IMH05H with NVIDIA GeForce RTX 2060 6GB GDDR6/Intel Corporation UHD Graphics (rev 05) and an Intel Processor. After dual booting windows and Ubuntu 20.04 I encountered a few ...
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1answer
694 views

Cannot adjust screen backlight Ubuntu 20.04 on Lenovo Legion Y7000P2020H

I have Ubuntu 20.04 installed on my Lenovo Y7000P2020H laptop alongside Windows 10. I can adjust my screen brightness in Windows but not in Ubuntu 20.04. Neither the fn keys nor the brightness scroll ...
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249 views

Can't adust brightness immediately (need restart) on Dell Inspiron 7506 2-in-1 with Ubuntu 20.04

I am having trouble with the hardware brightness keys (fn+F6 and fn+F7) of my Dell Inspiron 7506 2n1. At first, they were simply not working at all. Following tutorials, I added acpi_backlight=vendor ...
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225 views

Lenovo Legion 5P Screen Brightness stuck at max

I just got a new Lenovo 5p (15IMH05H) and got xubuntu on it But the screen is stuck at max brightness and it just won't turn down The controls works, it sets the values in /sys/class/backlight/ and ...
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1answer
245 views

MacBook Pro screen brightness adjust not working (15" mid 2014 model w/ GeForce 750M, Ubuntu 20.04.1 LTS)

Issue I installed Ubuntu 20.04.1 LTS on my MacBook Pro 15" Mid 2014. As many others, I can not get the brightness adjustment to work. Whenever I press the corresponding keys F1, F2 the brightness ...
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308 views

how to disable auto key board backlight turn on?

I have installed Ubuntu Mate 20.04 on Lenovo ThinkPad e15. I can control key board backlight through Fn + space key, but once I switch off leds, after some time (sleep to wake up) it will turn on ...
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75 views

/sys/devices/platform/dell-laptop/leds/dell::kbd_backlight missing folder. How to get it?

Got a new Dell Latitude 3510 laptop loaded with Ubuntu 18.04. The keyboard backlight is NOT working. Checked the BIOS configuration but nowhere any setting is available. Checked the /sys/class/leds ...
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Waking up from suspend into Linux causes backlight to flicker with no login screen, link_training failed

I have a 2015 Dell Inspiron 5558 (the Nvidia 920M 4GB version), running Linux (Ubuntu 16.04). When I open the lid after sleep, and the screen turns on, it doesn't show the login page. I can see the ...
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180 views

Sudden black screen with backlight on after teardown

My LG S43 laptop has dual-boot Windows 10 (upgraded from Windows 8) and Ubuntu 18.04.5 LTS. It worked fine for 2 years, but recently I decided to open it up to clean the fan and replace the thermal ...
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34 views

Inspiron 13 keyboard backlight keeps turning on

My keyboard backlight keeps turning on after boot and resume from suspend. I checked and tried all solutions on this site but it didn't work. (Including this one. Dell XPS 13 9343 - keyboard backlight ...
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Why is my screen dimming and what can I do about it (Ubuntu 20.04 in Virtualbox on Windows 10)?

When I open a small window in Ubuntu 20.04 that puts the rest of the screen in a dimmed background color, the laptops dims the screen even more. For example, when I am using the browser with the ...
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1answer
125 views

Asus AMD Laptop keyboard backlight (20.04)

I'm new to Linux and I'm trying to get my dual boot system set up (Asus Rog laptop with AMD Ryzen 7 and NVIDIA GPU). This in its self has presented its own problems but I have updated my kernel to 5.8 ...
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258 views

Turning off ASUS aura in Ubuntu 20.04

I have an ASUS A15 with Ubuntu 20.04 installed. There's a rainbow backlight on the keyboard that might be pleasant if I could control it, but I also think it's eating the battery. I'd like to turn it ...
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27 views

Suddenly no brighness chaning possible. Xfce4, under 18.04

It seems something got updated and now I can not change the screeen brighness on my laptop: also xbacklight outputs xbacklight No outputs have backlight property xfc4-power-manager sadly outputs in ...
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1answer
235 views

Dell Inspiron 3593, Linux Ubuntu - how to change backlight PWM frequency? intel_reg read 0xC8254 doesn't work

I would like to increase screen backlight PWM frequency in Dell Inspiron 3593 with factory installed Ubuntu (this laptop, like many other Dell models, probably has only 200 Hz). I read that it can be ...
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41 views

Thinkpad 20T9-S00K00: Backlight barely dimmable

thanks for stepping by. Problem: LED display backlight does not change (much). There is only a very minor difference between 100% and 10%. TL;DR: Solved by updating to kernel 5.7.10 and using light (1....
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38 views

Metoo Zero keyboard backlight stays on after system shutdown

related: https://superuser.com/questions/1244145/turn-off-keyboard-backlight-when-shutting-down-linux My keyboard is Metoo Zero. On Windows its backlight was turned off after shutdown. However, on ...
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1answer
33 views

Replaced screen for my laptop, now can't control brightness (16.04)

I replaced the broken screen on my laptop (System76 Gazelle 11, rebranded Clevo W60RZ1, running 16.04) with one I ordered from a replacement screen site and I can no longer control the brightness from ...
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84 views

ubuntu 18.04 not shutting down backlight error

I have Ubuntu 18.04 and my laptop is not shutting down when pressing the power off button. Also, when starting it up, this error is shown: Failed to start Load/Save Screen Backlight Brightness of ...
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1answer
787 views

Can't change brightness on HP Envy x360 13z-ay000 laptop (Ubuntu 20.04)

I just installed ubuntu 20.04 on my laptop and the brightness controls do not work. When I press the built in brightness control keys, the brightness bar pops up and goes up and down but it doesn't ...
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acpi_backlight issue with wifi

I was having problem with changing my brightness on my Ubuntu (LTS 20.04). I followed the instructions in this post Brightness problem Ubuntu 18.04 LTS Now after rebooting I was able to change the ...
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brightness not working (Ideapad)

I recently installed Ubuntu 20.04 on an Ideapad 3. As per title I can't control the brightness in any way. Using the function keys to change it has the only effect of editing the "sys/class/...
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1answer
465 views

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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89 views

Two display backlight devices (powertop) draining battery life in Ubuntu 18.04

I hardly getting 1hour battery life on my hp laptop,I found that two instances with same name (from PowerTop v2.9 statistics) draining huge amount of battery. please any solution. here is the ...
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497 views

Brightness problem with laptop in Ubuntu 20.04 LTS (no Intel Graphics, Nvidia only)

I have had issues with screen brightness not saving in my Clevo Sky-X4C-P7xxTM1-G since 18.04 LTS. I have tried this solution and it didn't work for me. I did make some progress with editing grub when ...
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0answers
276 views

How do I set default screen brightness?

Before you say this is a duplicate, I've already looked at this and this and that did not solve my problem. I installed Ubuntu 20.04 LTS and ever since the beginning it has maximum brightness by ...
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1answer
91 views

Brightness control by slider not working

I accidentally used "chmod -R 755" command in the root directory and halfway through the command executing I force shut downed my system. Now the boot time has gotten slower and also sudo ...
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0answers
433 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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2answers
129 views

Cannot get backlight controls to work for an external monitor on a NUC on Ubuntu Server 20.04

I am trying to set up backlight controls, but cannot find a way to make it work. By default I have /sys/class/backlight/acpi_video0, but that does not respond to my brightness settings. Knowing that ...

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