Comment 6 for bug 267245

Same here on a Toshiba A200 laptop... (volume up/down only affects PCM, no matter the selected master channel)
What's more, changing the shortcuts from system settings>keyboard&mouse>keyboard shortcuts to assign volume up/down to changing the front channel's volume makes the controls do nothing at all.
Another thing is that several sounds, such as startup/shutdown and sounds from emesene aren't affected by PCM volume, only by the front channel one. (this is probably irrelevant, it just occurred at the same time...thought it wouldn't hurt to mention)