Questions tagged [backlight]
Question about controlling the background illumination of liquid crystal displays (LCDs). For issues about backlit keyboards, use "keyboard-backlight" instead.
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Is there a more detailed explanation of the acpi_backlight parameter than provided by the kernel documentation?
On my computer, the none/vendor/native seems to make the same thing and I wonder the reasons behind that
Detailed info posted here
My thoughts: my computer use Nvidia as backlight device, so the ...
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New (but 2016) Razer keyboard backlight cycles
I get my new-but-old Razer keyboard (Blackwidow Ultimate 2016) out of the box.
(old Kubuntu, can't update or install stuff)
And keyboard works, but the back-light annoyingly goes on and off every few ...
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Virtually reconnecting keyboard
My problem is as follows: I use a Steelseries Apex M800 keyboard, which means it has proprietary RGB software for the keyboard backlight (I chose my keyboard before I switched to Linux, so I am aware ...
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Brightness control not working on IdeaPad 3 17ABA7 (amdgpu)
I have a Lenovo IdeaPad 3 17ABA7 with a fresh Debian Bullseye installation. Unfortunately the screen brightness control doesn't work out of the box.
lspci lists the following video device:
04:00.0 VGA ...
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Lose control of backlight after suspend
I have a Lenovo Legion 5 15ARH7H with
CPU: AMD Ryzen 7 6800H with Integrated Graphics
GPU: NVIDIA RTX 3060 Laptop GPU
Mux switch is set to Dynamic/Hybrid Graphics
Distro: Fedora 36
Kernel: 5.19.4
...
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Disable cores when display is off
I am trying to create a rule for intel_backlight so it can run my command. When testig
udevadm monitor
I don't see any changes. If someone could help please. This is my rule
SUBSYSTEM=="...
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Turn off monitor backlight (DPMS) from a VC/VT (TTY) without Xorg/Wayland-DE
How does one flip a monitor's backlight on/off from the normal Linux console (tty1)?
I'm looking for a way to do this without dependencies on Xorg or specific Wayland-Compositors.
Let's say, that I ...
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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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Increase/Decrease Brightness F-keys on Keyboard not working in AlmaLinux?
After installing AlmaLinux on a Toshiba Portege laptop and choosing the workstation setup, the brightness control keys do not work.
The hardware is capable and Linux compatible, as evidenced by the ...
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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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Backlight adjustment buttons on Thinpad T495 don't work
I don't see any events when I run xev and press either the brightness up or down keys.
I have configured i3wm to handle the XF86MonBrightnessDown and XF86MonBrightnessUp, but they won't get triggered ...
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"Failed to start load/save screen backlight brightness" after spontaneous restart
My PC is running Manjaro. Unfortunately since recently my PC is restarted by itself and is then displayed to me that.
[FAILED] Failed to start load/save screen backlight brightness of backlight:...
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RGB-backlight keyboard interactive context-sensitive integration with Linux environment
I would like for example when editing in VI, that my RGB keyboard would highlight shortcut keys in different colors, or when I press CTRL in gnome then pgup, pgdown, up, down, would be highlighted in ...
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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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Lenovo screen backlight can not set with brightness function Fn keys
Being aware of that this is partially a known issue, since each is individual and different, the problem is as following:
On my Lenovo Laptop with Linux Mint the backlight cannot be set using Fn+F6/F7....
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Please help me with my persistent brightness control issue
I've had this issue throughout distros. Arch, Debian, Mint, etc. Tried gnome, kde, xfce. My brightness control buttons, Fn+Vol_Up / Fn+Vol_Down will not actually do anything. I still get a gui ...
user334374
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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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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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Specify minimum backlight level with pwm-backlight
I have a device that uses PWM for backlight. It is using the pwm-backlight driver. However, you can turn the backlight down so far that the screen turns off, and then it is hard to turn it on again ...
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xrandr and xbacklight not changing brightness in ubuntu 18.04
I reinstalled NVIDIA drivers on my Dell laptop with Ubuntu 18.04 and xbacklight stopped working.
I never managed before to adjust brightness using system shortcut keys (changing GRUB settings didn't ...
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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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is my Lid Switch broken? [Debian]
yesterday, on a ThinkPad Edge E520-1143B laptop, I did an upgrade from Debian 9 (Stretch) to Debian 10 (Buster) following these two guides:
https://wiki.debian.org/DebianUpgrade
https://linuxconfig....
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Minimalist X11 tool for night light
I'm running OpenBox on a Debian 10 Buster system and I'm looking for a simple minimalist command line tool to toggle night light (as in Ubuntu). Any suggestions?
user400679
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Non-integer value to (/sys/class/backlight/intel_backlight/brightness)
Some two years ago, I was able to set a very dim backlight brightness by writing a non-integer value to /sys/class/backlight/intel_backlight/brightness.
$ echo 0.3 > /sys/class/backlight/...
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Back-light control for dual screen laptop
I've recently installed Pop!_OS on my new Asus Zenbook Pro Duo - UX581G.
This laptop has 2 built-in displays and they work out of the box on linux just fine, at least for the most part. Using xrandr ...
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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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i3 Screen Brightness Control using light
So i have recently started using i3 on my arch install. slowly i setup my config files with keybinds and all. About 2 days ago i install light ( to control screen brightness ) and it was working fine. ...
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Why does acpi_listen show different events for gnome-session vs i3?
When I run acpi_listen while running gnome-session or ubuntu-session, and press the Brightness Up/Down keys on the keyboard, I get output like this:
video/brightnessdown BRTDN 00000087 00000000
video/...
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Brightness - external monitor drivers
I'm using Linux arch on Thinkpad X1C6.
I bought external monitor Samsung C27F396FHU and I have a problem with brightness.
I cannot use a physical button to adjust the brightness of the monitor - at ...
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Backlight of external keyboard with linux mint
I just bought Redgear Grimm backlight external keyboard to work with linux mint 18.3.
The backlight didn't work initially and after some poking around I found
/sys/class/leds/
and I am able to turn ...
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KEEP backlight off + LCD on with cursor/keyboard input
I'm trying to keep my backlight off but the LCD on even though inputs are coming from the keyboard and/or trackpad.
I'm working on an Asus Aspire One running Linux Mint (32bit).
I've just installed ...
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Intel i915 and xbacklight: No outputs have backlight property
When I run xbacklight I get
xbacklight
No outputs have backlight property
I've seen other posts mentions this but I do have a /sys/class/backlight/intel_backlight. I can write to the file and this ...
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Changing screen brightness with keys doesn't work on clevo based laptop
So I've got Debian with GNOME on my Clevo N85_87HP6 laptop with a GTX1060 video display adapter plus Intel's integrated GPU. Pressing fn + f8/f9doesn't change my screen's brightness. I've tried using
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brightness | xrandr | what does it mean - software only modification?
xrandr
--brightness brightness -
multiply the gamma values on the crtc currently attached to the output to specified floating value. Useful for overly bright or overly dim outputs. However, this ...
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How to blacklist pwm_backlight?
I want to control PWM from sysfs. I have /sys/class/pwm/pwmchip0 and cat npwm gives 1. However, when I try to echo 0 >> export I am given with Device or resource busy. I checked cat /sys/kernel/...
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"No outputs have backlight property" but xorg.conf is configured and xbacklight is installed
I'm using a Lenovo laptop with Intel video drivers, and I'm trying to control the brightness. I installed the xbacklight and xserver-xorg-video-intel packages, added these lines to /etc/X11/xorg.conf:
...
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Find driver used for backlight control
I can control backlight using /sys/class/backlight/.. but is there a way to identify which driver (module) is used internally to actually control the backlight intensity?
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What mechanism allows the unprivileged graphical session to control the backlight device?
Wayland (or unprivileged Xorg) is able to access DRM and input devices by fd-passing from systemd-logind or equivalent. I can see these devices (for the first seat) in loginctl seat-status seat0.
...
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How to possibly turn a display physically off and on with a software command?
Is there a software way to ask the video driver to turn a display physically off and on?
Some times (often) my laptop built-in display backlight won't turn on after the laptop wakes up from suspend. ...
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How can I change the backlight of an external monitor?
I have a laptop with an external monitor connected via HDMI (output name is HDMI1). The command xbacklight works only with my primary screen (which is the laptop screen).
It doesn't work even if I ...
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Lenovo Y720 Keyboard backlight & Extreme cooling on Arch Linux
I installed ArchLinux on my Lenovo Legion Y720 laptop and I can't turn on Keyboard lights and Extreme Cooling as I could in Windows 10 using Lenovo NerveSense app. How can I access these on Linux? Is ...
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Alienware R3 touchpad light in linux
I got a new Gentoo linux install running great on my new Alienware 13" R3 laptop.
The keyboard lights light up great, but not the touch pad...which does light up in Windows.
Does anyone how to ...
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Can't control backlight on Thinkpad P50 running Debian stretch
I've got a Thinkpad P50 running the latest version of Debian stretch. My desktop environment is mate.
I'm unable to control my laptop's backlight through any means. There are no backlight interfaces ...
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CentOS 6.9 brightness change don't work
I have Intel HD 620 graphics card on my laptop. I have installed CentOS 6.9, but I can't change brightness of my monitor.
On Windows 10 it works without any problem. In my case /sys/class/backlight ...
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Turn off LCD backlight so that mouse and keyboard do not wake the screen
I'm trying to accomplish what I had in my old ASUS U36SG laptop: an Fn key turned the screen off. Hitting any key or touching the mouse/touchpad wouldn't wake the screen, only the same Fn combination ...
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backlight:acpi_video0: No such device
I installed for two weeks Arch Linux. As Display Manager I have installed LightDM.
For some days I get an error durning system boot from lightdm.service and systemd-backlight@.service.
I see only a ...
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Brightness key issue on Lenovo P71
I've got a Lenovo Thinkpad P71 with the NVidia Quadro P3000, that has the "Discrete Graphics" setting on the BIOS, and I'm using the proprietary drivers on Debian 9.
For some reason, the brightness ...
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Sysfs LCD backlight as thermal device
I have Compaq CQ60-120ec notebook. I discovered that there is a directory /sys/class/thermal/cooling_device2.
The type said LCD. I tried to control the cooling device, and it dimmed my backlight on ...
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Macbook backlight not working on Arch
I am not able to set my screen brightness on my macbook running arch linux. The macbook is a 15 inch 2012 model and I am using Arch Linux 4.11.5-1.
I have read up on arch linux wiki "backlight", "Mac",...
user236618
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Control backlight as a user (without xbacklight)
I'm working on Gentoo and Intel modesetting driver for my video card. That's why xbacklight isn't working.
I can write inside /sys/class/backlight... whith a root acount but that's not what I want ...
