Questions tagged [brightness]

Questions related to screen brightness.

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Disable automatic brightness according to content in Ubuntu 14.04

I am running Ubuntu 14.04 LTS on a Dell Latitude E3440 laptop. My problem is that screen brightness automatically changes depending on content. This means that the screen gets brighter when the ...
Ashish Maheshwari's user avatar
7 votes
1 answer
1k views

Ubuntu 22.04 / Modify Power Saver Behavior (Do Not Dim Screen)

First of all, I think it's really cool that Ubuntu 22.04 (I upgraded from 20.04, the last LTS version) now has the ability to switch between different profiles. Depending on what I do, I have times ...
Markus Gratis's user avatar
7 votes
1 answer
3k 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 ...
max5555's user avatar
  • 317
6 votes
1 answer
2k views

No screen brightness slider on Ubuntu 22.04

Since I installed Ubuntu 22.04, I can't change my screen brightness as there is no slider nor such configs under settings > power. I have no idea what to do. Already tried to edit grub sudo gedit /...
Joao Donasolo's user avatar
6 votes
1 answer
2k views

ddccontrol is not working, but it used to work

I want to change my monitor (Dell S2216H) brightness with commands ddccontrol -p -r 0x10 -w 53 This command used to work on 16.10 now it doesn't, but gives this output robing for available monitors....
Sumeet Deshmukh's user avatar
6 votes
1 answer
381 views

"monitor brightness down" key resets brightness before lowering it

My monitor brightness down key resets my brightness before lowering it, effectively leaving me at near max brightness. I do not experience any problems with the brightness up key. I'm using a Dell ...
Akisame's user avatar
  • 3,313
5 votes
1 answer
4k views

Laptop brightness issue in ubuntu 20.04

I am unable to reduce Laptop brightness in Ubuntu 20.04 after upgrading. Installed brightness-controller to adjust brightness but still unable to adjust the brightness. sudo add-apt-repository ppa:...
Sreeraju V's user avatar
5 votes
1 answer
2k views

Brightness fn keys not working new HP gaming laptop

I know This has been asked to death. I have dealt with it before on other laptops. And I have tried al these combinations in /et/default/grub and run a sudo update-grub reboot, test, fail. ...
janw's user avatar
  • 546
5 votes
0 answers
2k views

Xubuntu 15.04 black screen after screen lock

I am using Xubuntu 15.04 with Xfce 4.12 in a Dell Inspiron 14 laptop, model 3442. Whenever I lock my screen, then put my password and unlock it, the screen brightness gets very low, it's almost as if ...
Douglas De Rizzo Meneghetti's user avatar
5 votes
1 answer
2k views

How do I stop the lock screen from dimming to black?

I've spent a ton of time searching for this on Google, and I still can't seem to find it. Please read fully before answering, because the majority of the answers I'm finding are about preventing ...
Harsha K's user avatar
  • 173
5 votes
1 answer
634 views

Can't change brightness after disconnecting second monitor

When I boot up with 2 monitors, or when I connect the second monitor to my laptop, I can change brightness of the laptop screen in the usual sense. After disconnecting the second monitor, when I ...
eaydin's user avatar
  • 211
5 votes
1 answer
254 views

Brightness resets to zero on an HP dm4 Pavilion

Everytime I reboot my HP dm4 Pavillion the brightness is zero on my screen. BTW I use a Ubuntu 12.04..
jaikvk's user avatar
  • 51
4 votes
2 answers
3k views

UBUNTU 22.04 LTS - Changing brightness with xrandr doesn't work

In the CLI, xrandr --output MONITOR_NAME --brightness 0.7 seemingly "works" because no feedback is shown. After using xrandr --verbose | grep Brightness, Brightness: 0.70 is shown as output ...
user avatar
4 votes
0 answers
620 views

Automatic brightness missing from settings in Ubuntu 20.04

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. I tried to google and found this ...
John's user avatar
  • 173
4 votes
0 answers
125 views

Screen goes black after waking from suspend on Lubuntu 21.04

The screen of my laptop goes black when it wakes up from suspend. I don't think that the laptop freezes because I can do REISUB. I suppose it's a problem with the brightness, but I could be wrong. ...
user avatar
4 votes
3 answers
2k views

Artificially lower brightness on all screens

I'm using XPS 15 with an external monitor and the XPS even at the lowest is superbright and I get headaches. I used xrandr in the past and it worked but with latest Ubuntu versions it doesn't. ...
Pithikos's user avatar
  • 1,283
4 votes
0 answers
2k views

Slow brightness change on Ubuntu 18.04

I have a problem of too slow brightness change when I use the resp. keys on my keyboard. When I push one of the keys just shortly it takes about a second for the brightness to decrease/increase. ...
Timkolm's user avatar
  • 41
4 votes
1 answer
4k views

Brightness buttons on Hp laptop not working

EDIT: : The first link mentioned in the question may work for some. In the latest hp laptops like hp-au111tx(mine), to change the brightness/backlight there are two function buttons which can be ...
sarthakgupta072's user avatar
4 votes
0 answers
827 views

Brightness Keys Not Working Lenovo Edge

The brightness hotkeys on my lenovo edge 2-in-1 are F11 and F12, but they don't work on Ubuntu for some reason. when testing on the keyboard layout screen in the text entry settings on Ubuntu 16.04, ...
dakatk's user avatar
  • 163
4 votes
1 answer
2k views

Disable Dynamic Brightness Dell LCD

I have a Dell Inspiron 11 3000 Series laptop that has built in Dynamic Contrast/Brightness in the screen. The screen automatically adjusts it's brightness according to how many white pixels are on the ...
Cheddar's user avatar
  • 41
4 votes
0 answers
742 views

Can I display volume or brightness popup using command?

When you adjust your brightness or volume in ubuntu, you would see a popup notification in the top right corner of the screen to notify you the level of brightness or volume. Just as follows: I can ...
Searene's user avatar
  • 4,330
4 votes
1 answer
1k views

Ubuntu 15.04 brightness doesn't work

brightness on my Lenovo-IdeaPad-P400-touch graphic Intel® Ivybridge Mobile os type 64-bit Ubuntu 15.04 doesn't increase or decrease after updating from 14.04 please help!!!
azizo1's user avatar
  • 41
4 votes
1 answer
466 views

Unable to change screen brightness with hotkeys on Ubuntu 14.10

Just upgraded to Ubuntu 14.10, and now my brightness keys aren't working. Is there a fix for this? I suspect that Linux kernel 3.16 is the culprit...
user avatar
4 votes
1 answer
970 views

Ubuntu 14.04 locks screen without dimming during fullscreen video playing?

I upgraded from 13.10 to 14.04 yesterday, and it appears that something has changed concerning how screen dimming works during fullscreen video playback. This problem does not occur during video ...
user154885's user avatar
4 votes
1 answer
2k views

Specific function keys not working

My Toshiba C800 laptop (12.04 LTS desktop) has special function keys as follows: fn + : F2 -> BRIGHTNESS DOWN F3 -> BRIGHTNESS UP F4 -> DISPLAY SELECT F5 -> TOUCH PAD on/off F6 -> PREVIOUS ...
Nirjon Nj's user avatar
4 votes
1 answer
907 views

Remap function keys to commands?

I'm running Ubuntu 12.04 on a Samsung Series 9 (900X3A-A03), and changing the brightness through the function keys or the brightness control UI causes flickering and general instability, so I have a ...
Ryan Lester's user avatar
3 votes
1 answer
646 views

How to disable auto brightness adjustment in Ubuntu 22.04?

Everytime most elements in my screen are white, brightness goes up. Then, some black elements appear and the screen's brightness goes down. How can I permanently disable this annoying behaviour? I ...
mkole's user avatar
  • 191
3 votes
1 answer
2k views

Nvidia RTX 3060 in Ubuntu 22.04 - Flickering/Brightness controls not working

I have a Dell G15 with a Nvidia GeForce RTX 3060 Mobile graphic card. Just installed ubuntu 22.04 alongside with Windows, but I have two main problems: Screen flickers randomly. Brightness controls ...
Joe82's user avatar
  • 91
3 votes
0 answers
26 views

brightness of the screen according to area

I have a serious problem with my eyes. I want to adjust the brightness level of the screen according to the area of the screen. For instance, I would like to only brighten two or three lines when I ...
Taro's user avatar
  • 169
3 votes
2 answers
1k views

Unable to adjust display brightness in Ubuntu 18.04

I use an HP laptop with an AMD R7-5800U CPU and Ubuntu 18.04, and I can't adjust display brightness with kernel versions 5.4 or 5.10.3. I also tried other solutions, including adjust the brightness in ...
Roger1219's user avatar
3 votes
0 answers
2k views

xrandr: Failed to get size of gamma for output default

Problem: I can't adjust my brightness in ubuntu 18. The keyboard buttons, the slider, the terminal commands, none of them are working. What I've tried: installing an application, but it had no effect....
Rahul Verma's user avatar
3 votes
0 answers
116 views

How to make Ubuntu 18.04 remember the brightness setting after rebooting?

I'm currently using Ubuntu 18.04.5LTS, and I found that every time I reboot my PC, the brightness automatically goes back to 66%. However, it seems that the volume setting is remembered every time I ...
Chengkun Li's user avatar
3 votes
2 answers
1k views

Cannot adjust brightness in Xubuntu

I has been a week I've been trying different fixes from askubuntu.com and other sites but no one seems to work. I'm using Lenovo V14 notebook. I has an integrated GPU and a Ryzen 5 4500U . The ...
Ezequiel Estrada's user avatar
3 votes
0 answers
362 views

Using automatic screen brightness with ThinkPad X260

I'd like to use automatic screen brightness with my X260 under Ubuntu 18.04. In Windows 10 it worked properly, but with Ubuntu the sensor is not found or I don't know - I'm not able to set automatic ...
YvanEhtNioj's user avatar
3 votes
0 answers
577 views

18.04 Lenovo ideapad backlight

I've spent many hours trying to find a solution but nothing seems to work. I've successfully installed Ubuntu 18.04 on Lenovo G505S laptop in UEFI mode with just nomodeset flag added to grub. ...
melez's user avatar
  • 31
3 votes
1 answer
2k views

Lenovo volume and brightness keys not working on Ubuntu 18.04

They worked fine in Ubuntu 17.04 and 17.10, but nothing happens in Ubuntu 18.04. Running xev I can see the key presses are being interpreted correctly. I see XF86AudioMute, XF86AudioRaiseVolume, ...
tobyink's user avatar
  • 131
3 votes
0 answers
625 views

Reduce oled brightness without compromising color depth on X1 Yoga?

This question overlaps with Lenovo ThinkPad X1 Yoga OLED Brightness and Can't control the display brightness on Lenovo X1 yoga OLED, except that these questions' answers reduces the color depth ...
LyingOnTheSky's user avatar
3 votes
0 answers
179 views

Ubuntu automatically reset my screen brightness after screen lock

I am using Ubuntu 16.04. My laptop model is Toshiba Satellite L600 and therefore the graphic card is ATI Mobility Radeon HD5145. I find that each time I wake my screen from a lock by inactivating for ...
cyfex's user avatar
  • 71
3 votes
0 answers
78 views

Cannot change screen brightness on ubuntu 16.04 LTS or connect to WIFI

I have been running ubuntu 16.04 LTS for about a month now, and I have had no problems. I ran an update this morning, and now, I cannot change screen brightness. I am getting no feedback from the ...
A. Larkin's user avatar
3 votes
1 answer
489 views

Function keys change wrong backlight file on my Acer Aspire One

Whenever I press the function keys to change my laptop's screen brightness, it modifies the value stored in the file /sys/class/backlight/acer-wmi/brightness, but my screen stays the same. With a bit ...
The Guy with The Hat's user avatar
3 votes
0 answers
1k views

thinkpad_acpi disabling brightness events

After installing routine updates, my keyboard brightness controls, wireless on/off, and other controls have stopped working. Interestingly, the 'lock' key still works. I have looked at a few other ...
Aaron's user avatar
  • 71
3 votes
1 answer
272 views

Brightness control is blocked after reaching minimum

Several days ago I tried to fix a quite popular problem. I have Ubuntu 15.10. In my computer the brightness control keys weren't working. I have added a file /usr/share/X11/xorg.conf.d/20-intel.conf ...
Tosiek's user avatar
  • 31
3 votes
0 answers
521 views

How to link brightness button to correct brightness script

I recently upgrade my Ubuntu from 12.04 to 14.04. My laptop has always had incomtibility issues between the brightness button and the actual brightness set up. In 12.04 I had fixed the problem by ...
dugar's user avatar
  • 131
3 votes
0 answers
884 views

Screen brightness issue Toshiba Portégé after 15.04 upgrade

I have a Toshiba Portégé Z30-A-13P. I can no longer adjust my screen brightness after upgrading Ubuntu to version 15.04 (Kernel 3.19). The screen brightness (as well as the touch-pad) didn't work ...
MarcoW's user avatar
  • 141
3 votes
0 answers
4k views

Can't change screen brightness running Ubuntu 14.04LTS on Samsung NP510R5E

FIXED! After DBANing my hard drive I installed Ubuntu 14.04LTS and quickly realised I've been unable to change screen brightness. This isn't too much of an issue when AC power is plugged in as the ...
BlairA15's user avatar
3 votes
0 answers
1k views

gcm-calibrate without hardware sensor

My monitor won't allow me to set the contrast when using DVI. And ubuntu/gnome won't allow me to set it via software without some fancy color calibration sensor. on system settings > color the "...
gcb's user avatar
  • 255
3 votes
0 answers
783 views

Ubuntu 14.04 + Bumblebee, Unable to control Brightness and have Bumblebee working at the same time

I'm current running Ubuntu 14.04 with a GTX 780m gpu on my laptop and using nvidia-331 drivers with bumblebee. I was unable to control the brightness of my screen, but then I decided to follow some ...
Raphael Barros's user avatar
3 votes
1 answer
127 views

Brightness is reset to Maximum on every Restart in Ubuntu 13.10

I have upgraded from 13.04 to 13.10. After every reboot the brightness is set to maximum. Is there any solution?
user247090's user avatar
3 votes
0 answers
694 views

Fn key combination *suddenly* stopped working for brightness only

I've looked at most of the questions relating to enabling hardware brightness control under Ubuntu with the Acer Aspire S3 laptop; initially these fixes worked, under the initially installed kernel 3....
bright-star's user avatar
3 votes
2 answers
1k views

I can't modify the screen brightness on Xubuntu 13.10

I got this problem with brightness on my fresh xubuntu 13.10 install.. It ain't inc/decrease the screen brightness when pressing Fn+F5/F6 !! I've tried some solutions like setting these values in ...
Ayman Nedjmeddine's user avatar

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