Have you changed it in System>Preferences>Sound, at the bottom of the first tab?
You can change there what the multimedia keys control, so choose the frontal speakers or master volume.
If that doesn't work, try changing the device (just above it).
Please, let me know whether it solves your problem.
Have you changed it in System> Preferences> Sound, at the bottom of the first tab?
You can change there what the multimedia keys control, so choose the frontal speakers or master volume.
If that doesn't work, try changing the device (just above it).
Please, let me know whether it solves your problem.