I test the bluetooth and I have the same noise. It's very low and I
think it come near from the subwoofer. I hear much the fan.

Another trick : when I unplug my charger, the brightness don't reduce.
So I add a script for pm-util :

- sudo vi /usr/lib/pm-utils/power.d/brightness
- Put this :

#!/bin/sh
  
case $1 in
    true) echo 5 > /sys/class/backlight/acpi_video0/brightness ;;
    false) echo 10 > /sys/class/backlight/acpi_video0/brightness ;;
    *) exit $NA ;;
esac

exit 0

- sudo chmod +x /usr/lib/pm-utils/power.d/brightness

And now, it work

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https://bugs.launchpad.net/bugs/613963

Title:
  Kubuntu on HP Envy 17 - 1010el

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