many thanks oldcpu, 
in yast>sound configuration, pulse audio configuration is enabled in all the cases
when in pavucontrol>configuration>internal audio>profile I choose analog stereo duplex http://paste.opensuse.org/view/download/83274515in pavucontrol>input devices (show all input devices) appears 2 devices http://paste.opensuse.org/view/download/28939866 1)internal audio analog stereo, not muted, (weak activity in the level bar but not related to the real sound, if I talk it doesn’t move). 2)monitor of internal audio analog stereo, not muted; (no activity in the level bar).
as I understood, this two tests should avoid any doubt on muting the mic, may be, perhaps
I tested mic with arecord -vv -f S16_LE -c 2 new1.1.wav, mic works
I tested mic with arecord new1.2.wav, mic don’t works
when in pavucontrol>configuration>internal audio>profile I choose analog stereo output in pavucontrol>input devices (show all input devices) appears only 1 device http://paste.opensuse.org/view/download/87108949 (monitor of internal audio analog stereo), not muted (no activity in the level bar).
I tested mic with arecord -vv -f S16_LE -c 2 new2.1.wav, mic don’t works (as expected I suppose)
I tested mic with arecord new2.2.wav, mic don’t works
when in pavucontrol>configuration>internal audio>profile I choose analog stereo input in pavucontrol>input devices (show all input devices) appears 2 devices: 1)monitor of dummy output, not muted; (no activity in the level bar) 2)internal audio analog stereo, not muted, (weak activity in the level bar but not related to the real sound, if I talk it doesn’t move).
as I understood, this two tests should avoid any doubt on muting the mic, may be, perhaps
I tested mic with arecord -vv -f S16_LE -c 2 new3.1.wav, mic seems to works, becouse the level bar that appear on konsole moves when I talk and it seems that react in the right way, but it don’t record anything, no sound present in new3.1.wav.
I tested mic with arecord new3.2.wav, mic don’t works.
thank you very much again, I’m going to the beach now, is a nice day here today, have a nice day, ciao, Pier