This bug was reported bu Kevin Hunter at Launchpad.net

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When interacting with the computer in an innocuous manner, the screen saver should not be interrupted.

For instance, my RF kill switch for this laptop is on the side of this computer and is not related to the keyboard. It's physical positioning indicates the state of the wireless radio, so having something mentioned to me on screen is superfluous. Thus, when I turn on or off my wireless radio, the screen saver should not be interrupted.

Similarly, when I turn up or down the volume via keyboard hot keys, the screen saver should not be interrupted. The Gnome volume bar could still show up, on top of the screen saver, but the simple action of turning up or down the volume should not affect the screen saver.

Actions that I think should not affect the screen saver:

* Turning on/off the Wifi via the keyboard or other external means. (RF Kill switch)
* Checking the status of the battery. A pop-up similar to the Gnome volume bar could be used.
* Turning up or down the screen brightness.
* Turning up or down the speaker volume.

https://bugs.launchpad.net/ubuntu/+bug/367512