some past update fixed this.
Thanks
** Changed in: gnome-power-manager (Ubuntu)
Status: Incomplete => Fix Released
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Power Manager Brightness Applet bug
https://bugs.launchpad.net/bugs/200974
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Thanks for taking the time to report this bug and helping to make Ubuntu
better. Could you please attach the resulting log file of: gnome-power-
bugreport.sh &> gpm.log to the report? You might also want to take a
look to the Debugging instructions located at
https://wiki.ubuntu.com/DebuggingGNOME
