I'm not convinced that this bug is a duplicate of #268949, for two reasons:
1. 268949 describes the volume not responding at all to keyboard/button input. In this bug, the volume does respond to input, but does so continuously. I have verified that the GUI slider in the panel app does move up/down (and continues to move to max/min volume) when the volume buttons are pushed.
2. 268949 does not report the additional problems with mouse input after trying to use the volume up/down button.
These two bugs may be related, but they are not the same behaviors.
I'm not convinced that this bug is a duplicate of #268949, for two reasons:
1. 268949 describes the volume not responding at all to keyboard/button input. In this bug, the volume does respond to input, but does so continuously. I have verified that the GUI slider in the panel app does move up/down (and continues to move to max/min volume) when the volume buttons are pushed.
2. 268949 does not report the additional problems with mouse input after trying to use the volume up/down button.
These two bugs may be related, but they are not the same behaviors.