Ok, I've looked around and found a few things: 1) you're not the only person with this problem, and 2) according to the source code (in recent kernel anyway), it should expose the "Master Playback Volume" control.
EDIT:[If you're not using the latest version of ALSA you could try updating. You could try looking in /proc/asound/card0/ossmixer to see if there is a volume master, which may indicate something wrong with your configuration?]
So you can file a bug report with alsa-project.org's bugtracker, or alternatively if you want to ask very, very nicely you could email the developer? Some people don't like to receive emails, others will gladly help...
Sorry I have nothing better to report.
EDIT:[If you're not using the latest version of ALSA you could try updating. You could try looking in /proc/asound/card0/ossmixer to see if there is a volume master, which may indicate something wrong with your configuration?]
So you can file a bug report with alsa-project.org's bugtracker, or alternatively if you want to ask very, very nicely you could email the developer? Some people don't like to receive emails, others will gladly help...
Sorry I have nothing better to report.
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