Using YaST->hardware->Sound I configure one of the two sound devices:
RV770 HDMI Audio [Radeon HD 4850/4870]
First I delete the configuration, then I Edit the configuration and use the
default Fast automatic configuration. I use Other and Volume to set/check the
volume settings, which is quite a busy window with sliders. OK to exit.
Start the Sound module in YaST again. Select the above device. In Other select
Volume, which does not show the busy window anymore. Only at the top Master
volume and a Test button.
I assume this is a bug, not showing the sliders to set values.