There is this, but I don't know if it works with a recent version of Fedora.
Regarding the above, see comment at the bottom of the following page:
Maybe the following will work. I copied this from a French mailing list for a different model Sony.
Use sonyacpi and then type "sudo-s" then "echo" 8 "> / proc / acpi / sony / brightness" to maximum brightness and "echo" 1 "> / proc / acpi / sony / brightness "for a minimum brightness.
Instead of sudo, I would just use su -
to log in as root in terminal.