Gamma or gamut is is a certain complete subset of colors. The most common usage refers to the subset of colors which can be accurately represented in a given circumstance, such as within a given color space or by a certain output device. Use this tags for questions concerning gamut/gamma on Ubuntu.
Questions tagged [gamma]
16 questions
33
votes
3 answers
How to use "xrandr --gamma" for Gnome "Night Light"-like usage?
Background: More red / Less blue at night
To save the eyes at night, adding more red and/or subtracting blue, is becoming popular in Windows 10 (blue-light filter) and Linux; Gnome Desktop (Night Light) and Ubuntu Unity Desktop with add-ons such as…
WinEunuuchs2Unix
- 105,762
8
votes
1 answer
How do I change gamma on wayland
On X, I could change gamma by tuning the xorg.conf file and add a "Gamma" line with the right value to the "Monitor Section".
How do I do this on wayland?
[edit]Or: What's the name of the tool for doing this in wayland and how can I make that config…
Mitsch
- 81
5
votes
3 answers
How to change xrandr brightness without losing gamma settings?
KDE's Night Color feature I guess uses xrandr's gamma functionality, but I was hoping to adjust the brightness of my display using it. Unfortunately, doing so like this loses the "night color" because it resets the gamma:
xrandr --output DP-0…
Slbox
- 192
3
votes
1 answer
xrandr : Failed to get size of gamma for output default" for mDP type connection
My system specs :
Intel i7-8700k (Coffe-lake)
Mother board : ROG(Maximus X Hero)
OS :Ubuntu-Gnome 16.04
I booted my new PC with Ubutnu-Gnome 16.04, after installation the screen resolution is 1024x768(4:3), and screen is shown Unknown Display. I…
Harish Bodduna
- 41
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- 10
2
votes
0 answers
How to control the RGB components for gamma+brightness+contrast from command line?
I saw this on nVidia application. We can control, for each component of RGB, these 3 values: gamma, brightness and contrast (below showing only for Red component):
So, I want to know if we can access these 3 controls for each component from the…
Aquarius Power
- 4,149
2
votes
0 answers
How to manually adjust display gamma on 22.04 in wayland
I work on old HP laptop with additional monitor. After panel replacement everything was looking fine, until i connect additional monitor via DP. It's noticeable that build-in display switch rgamma to more red-ish while connecting additional monitor.…
mdkuch
- 21
2
votes
2 answers
Display brightness goes way up on suspend
Title says it all. When I lock, it stays the same, but if I suspend I'd say its going +100% brightness or idk what to call it. If I set the brightness to 0 I get a grey screen, if I set it to 1 I get a screen that has a massive white tint
On boot it…
Lucas Fleet
- 21
2
votes
1 answer
Dark brightness / gamma with Nvidia drivers
I have this problem... When Im on Ubuntu 16.04 (LTS) or basicly every Linux distro that i tried before, i have a bug. On open-source drivers, my brightness and gamma are normal, but when i use any nvidia driver (newer, older, doesnt matter), my…
1
vote
0 answers
All gamma control software fails silently
Related but non-functional: Is there a software utility to adjust screen gamma/brightness/contrast?
$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=22.04
DISTRIB_CODENAME=jammy
DISTRIB_DESCRIPTION="Ubuntu 22.04.5 LTS"
$ xrandr…
Reinderien
- 535
1
vote
0 answers
How to invoke a command when starting a user session?
OS: Ubuntu 22.10
graphic card: nvidia
monitor: philips
Issue: how to change default gamma after X11 startup.
The gamma command I wish to invoke is either:
xgamma -rgamma 0.6 -ggamma 0.5 -bgamma 0.5
or
xrandr --output DP-0 --gamma 0.6:0.5:0.5
I…
rob grune
- 1,161
1
vote
1 answer
Bad screen quality on new asus notebook
I bought a new Asus Vivobook. I installed Ubuntu 20.04 and when I connected my monitor via HDMI I saw that the screen quality is not so good. The brightness seams to high and the gamma (looks very red-heavy) is also not right.
I have a small second…
0
votes
0 answers
Problem with custom resolution ubuntu 17.04
I installed Ubuntu 17.04. I have a problem with the screen resolution, I want to set a resolution of 1366x768 but the max resolution that Ubuntu allows me is 1024x768.
I tried to increase the max resolution to 1366x768 using the xrandr command, but…
0
votes
1 answer
gamma adjustment is not working on ubuntu 21.04
I'm using dell with intel graphics I tried xgamma and xrandr for adjusting gamma values but both of them not working in 21.04, they are executing successfully but rgb value remains the same, it used to work fine in groovy. Is it happening cuz of the…
Pawan Patidar
- 1
- 1
0
votes
0 answers
Screen not recognizzed on laptop, xrandr goes "Failed to get size of gamma for output default"
Okay, that was a bold move.
Took this old Acer 3633WLMi and gave it a SSD and a shiny 18.04.3 in Lubuntu flavor.
According to most Ubuntu Wikis, this specific laptop should run smoothly, no issue reported...
NOPE
Apart from the wifi being dead…
Pylou
- 154
0
votes
1 answer
Ubuntu 19.04 has extra hidden gamma curve? (weird stuff...)
As soon as i loaded my test image i noticed the gradient was no longer smooth but it contained some vertical artifacts. I should point out that the gamma is set to default in Ubuntu: xgamma gamma 1.0
I also have Windblows 10 and OSX and there the…
dsolaris
- 538
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