There are a few steps you can try to resolve this issue: McKesson Connect

1. Check if your system is detecting the correct hardware for controlling screen brightness:
   Open a terminal and run the following command:

ls /sys/class/backlight/

This will list the directories in the "/sys/class/backlight/" directory. One of the directories listed should correspond to your screen's backlight control.

2. Check if the correct permissions are set for the backlight control:
   Run the following command to check the permissions on the backlight control:

ls -l /sys/class/backlight//brightness

Replace "" with the name of the directory you found in step 1. The output should show that the file is readable and writable by the user. If not, you can change the permissions with the following command:

sudo chmod 666 /sys/class/backlight//brightness

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