I was dying from the searing backlight of my laptop, so collectively lots of hours put into this but it's finally working how I want it, so I'm releasing it for testing.

Backlight Manager
This makes use of YAD (included with puppy) and xbacklight (included in this package). Took a lot of ...

I had the same problem, changed permissions to give owner read+write & voila, it works now...

By the way I think this is my first post here... Long-time lurker though