GUI Brightness Control

1. Your Parrot information

  • OS version: run cat /etc/*release
    ```
    DISTRIB_ID=Parrot
    DISTRIB_RELEASE=4.11
    DISTRIB_CODENAME=rolling
    DISTRIB_DESCRIPTION=“Parrot OS 4.11”
    PRETTY_NAME=“Parrot OS 4.11”
    NAME=“Parrot OS”
    ID=parrot
    ID_LIKE=debian
    VERSION=“4.11”
    VERSION_ID=“4.11”
    HOME_URL=“https://www.parrotsec.org/
    SUPPORT_URL=“https://community.parrotsec.org/
    BUG_REPORT_URL=“https://community.parrotsec.org/

     ```
    
  • Kernel version: run uname -a
    Linux Rechner 5.10.0-5parrot1-amd64 #1 SMP Debian 5.10.24-5parrot1 (2021-03-20) x86_64 GNU/Linux


### 2. If you have this problem after fresh installation:
1. How did you create USB bootable?

    - PendDriveLinux
    - Booted intro live mode and installed from live mode onto a partition

2. How did you install OS?
    - Debian installer 

My brightness control does not do anything. When I attempt to adjust brightness from the keyboard, the GUI responds and shows the brightness bar moving but the screen brightness remains the same unless I drop it to zero at which point the screen goes dark. I can adjust the screen brightness from terminal using: 

xrandr --output eDP-1 --brightness

and then inputting a value between 0 and 1. I have made sure the system is fully up to date but I am brand new to linux and haven't manage to track down why the brightness will not change from anywhere but within terminal.  Would love some assistance if anyone has seen this problem before or has an idea.

I had a similar issue some weeks ago where the screen brightness was none. My solution was to open a virtual console then open the following with sudo:
/sys/class/backlight/intel_backlight/brightness
then increase the number. The maximum number various depending on the hardware.

This is all assuming there’s no brightness. My experience was that a system restart also solved the problem.

Helpful links: