Comment 6 for bug 2049248

Further information:

I am using "xrandr --brightness …" in a background script that repeats every third of a second, to keep the brightness where I need it whenever the system resets it to 100%.

I've noticed that the system resets the brightness *exactly* every 60 seconds, with five resets over five seconds (the screen flashes each time before my script resets it). The resets aren't equally timed, but they always follow the same consistent pattern.

However, the system sometimes leaves the brightness alone for a longer period before reverting to resetting each minute.

I would love to be able to help by diagnosing what is causing that weird behaviour. The problem is that I have no clue whatsoever where to start.