Using Fedora38 with GNOME on Wayland
./gnome-gamma-tool.py -g 2.0
returns
No such display, found 0 displays.

thank you, this is a life saver.. just noting here that it doesn't appear to work in python 3.7.5

  File "./gnome-gamma-tool.py", line 73
    if fit and (maxval := max(val)) > 1:  # the walrus operator says hello
                       ^
SyntaxError: invalid syntax

(works for me in python 2.7.18)

ggt-log.txt
I tried to organize this a bit but you can tell me if it's good or not.

Preface

A lot of this file is redundant and I wasn't sure which information was useful vs which information was unnecessary so I opted to keep it all in this can be shortened later if it becomes an issue. It's a little above 17 thousand lines but it can be easily skimmed for some errors.

Steps to reproduce

Map the command sh /home/(username)/Projects/Gnome-Brightness-Ctl/brightness.sh Down to F9 in gnome keyboard settings.
Map the command sh /home/(username)/Projects/Gnome-Brightness-Ctl/brightness.sh Up to F10 in gnome keyboard settings.
Recreate the directory structure and paste my brightness script in that directory along with ggt(gnome-gamma-tool).
Spam the F9 and F10 keys or hold them down and the screen starts to freak out.

Theory

This is probably due to a race condition as mentioned here #2 (reply in thread)

Solutions

Find a way to limit the amount of times a user can run the script via the keybinds in a given time frame. However this is not ideal since the user should be able to change their brightness at will and as fast as possible.

title.

gnome-gamma-tool creates and applies profiles correctly, but when I logout, they disappear on GNOME settings app.

./gnome-gamma-tool.py -g 0.8
Current profile is /home/dom/.local/share/icc/edid-75c94e30cdd9a420ea7870abb5a85f5d.icc
New profile is /home/dom/.local/share/icc/gnome-gamma-tool-697e2bda-871c-41d7-90c5-262aa4f67dca
Traceback (most recent call last):
  File "/home/dom/gnome-gamma-tool/./gnome-gamma-tool.py", line 398, in <module>
    main()
  File "/home/dom/gnome-gamma-tool/./gnome-gamma-tool.py", line 384, in main
    mgr.make_profile_default(new_profile)
  File "/home/dom/gnome-gamma-tool/./gnome-gamma-tool.py", line 316, in make_profile_default
    self.cdd.make_profile_default_sync(profile)
gi.repository.GLib.GError: cd_device_error: SQL error: attempt to write a readonly database (9)

I used the --delete option, and now every call shows this. How to fix?

Current profile is /home/username/.local/share/icc/gnome-gamma-tool-5cf2d86e-60d7-4dc3-8b00-42493ccaf1c2
Traceback (most recent call last):
  File "/home/username/.local/share/src/gnome-gamma-tool/gnome-gamma-tool.py", line 350, in <module>
    main()
  File "/home/username/.local/share/src/gnome-gamma-tool/gnome-gamma-tool.py", line 315, in main
    profile_data = mgr.clone_profile_data(base_profile)
  File "/home/username/.local/share/src/gnome-gamma-tool/gnome-gamma-tool.py", line 239, in clone_profile_data
    return profile.load_icc(0)
gi.repository.GLib.GError: cd_icc_error: failed to load file: Error opening file /home/username/.local/share/icc/gnome-gamma-tool-5cf2d86e-60d7-4dc3-8b00-42493ccaf1c2: No such file or directory (0)

Tried for both of my displays. Profile does get applied as I can tell by checking in Gnome settings but it does not change gamma at all.

I guess it's due to Nvidia drivers not allowing gamma change on Wayland - but I do not know for sure as I have only read that information online. If so, it should be mentioned in the readme.

Regards =)

Hello!

Let us to read current gamma red/green/blue values from current profile when ran without arguments.

Just wanted to say I've been having this ongoing issue for months relating to brightness control. I use xrandr to change the brightness on Xorg so by itself that works fine. However with night light on gnome it doesn't work every time the temperature changes the brightness shoots back up and scorches my eye balls. I used to use a script with gnome and redshift but the issue with that was it randomly turned off when any application wanted to mess with my gamma. Also also there was no smooth transition with the temp and it didn't change when the sun set I just set keybinds to change the command to also change temp after the sun set. It was this whoooole big mess. But your script solved that completely it even solved another issue of remembering my settings past reboot!!! My eyes and my sleep schedule thank you. If you want my keybind script that I use on gnome for changing the brightness with your script I'd be happy to send it over.

After updates on Ubuntu 22.04.2 doesn't work with wayland. If I use X11 session, script changes gamma, but doesn't work with wayland. I have hybrid intel + nvidia graphisc. Everything worked before updates

Hello there,

I am attempting to use this software on Manjaro Linux. I have been simply only attempting to change gamma with the following:

./gnome-gamma-tool.py -g 0.8

I tried a few different variations of gamma, to see which I liked, it worked about 3 times. Each time I said 'N' to saving my settings. But now the program has no effect on screen brightness at all. I even rebooted my computer.

I tried changing contrast, which oddly, still works. But it ignores the gamma value each time.

Intel GPU on Wayland. Gnome version 45.4.

Is it possible to adjust display saturation level?

I have a weird problem on a secondhand laptop running Fedora Silverblue: GNOME is very blue.

I run the same OS on my other device and it's fine, so it's probably a fault with the monitor or a kernel/driver issue. Regardless of the cause, I was wondering if it might be possible to add the feature of changing the RBG values on the GNOME colour profile?

Reducing the gamma with this script has helped a bit, so I thank you for that :) Having this additional feature would help me shift it back to a more normal colour balance.

It creates the profile without error, and I can see the profile listed in Colors, and I can apply it to all users.

However, no visible change occurs.

Hi, great project! I can't seem to get it to work on my system. Here is the output:

$ ./gnome-gamma-tool.py -g 0.8 
Current profile is /home/matthew/.local/share/icc/edid-f17676179651299583cd4294bff1d6e2.icc
Traceback (most recent call last):
  File "/home/matthew/Compile/gnome-gamma-tool/./gnome-gamma-tool.py", line 350, in <module>
    main()
  File "/home/matthew/Compile/gnome-gamma-tool/./gnome-gamma-tool.py", line 333, in main
    new_profile = mgr.new_profile_with_name(profile_data, OUR_PREFIX + unique_id)
  File "/home/matthew/Compile/gnome-gamma-tool/./gnome-gamma-tool.py", line 248, in new_profile_with_name
    new_profile = self.cd.import_profile_sync(Gio.File.new_for_path(tmp_path))
gi.repository.GLib.GError: cd_client_error: The profile was not added in time (0)

GNOME Version: 42.5
OS: Ubuntu 22.04 (technically Pop!_OS, but using GNOME shell)
Laptop: Zephyrus G14 GA402RJ

Any idea if there's a simple problem this could be?

Could you add feature that vibrantLinux (https://github.com/libvibrant/vibrantLinux)?