This extension make you be able to change the brightness of external displays like LCDs. To ensure that this extension works properly, you needed to do the next: 1. install ddccontrol by running sudo apt-get install ddccontrol 2. Allow ddccontrol to run as sudo. You can do this by editing your sudoer file as follows: Open a terminal (ctrl+alt+t) and enter the following command: sudo visudo Once the file opens paste (ctrl+shift+v) the following command replacing username with the your own username: username ALL=(ALL) NOPASSWD: /usr/bin/ddccontrol Make sure that /usr/bin/ddccontrol is the right ddccontrol path by running: which ddccontrol This extension is based on Text Scaler Extension: https://extensions.gnome.org/extension/1018/text-scaler/
Note: Binary files aren't shown on the web site. To see all files, please download the extension zipfile.
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I don't think hard code "sudo ddccontrol -p" is good idea for normal user. You should try to find DBus API for screen or power control instead.
Could you please tell me where find information. It's so hard find Gnome Extentions information
You can try "lg" after ALT+F2 to browse whole API sets. https://wiki.gnome.org/action/show/Projects/Seed?action=show&redirect=Seed
Brightness Manager