Am 01.10.2010 09:05, schrieb Clemens Ladisch:
Sebastian H. wrote:
In alsamixer-qt4 I've just stumbled over enum elements for which both snd_mixer_selem_is_enum_playback and snd_mixer_selem_is_enum_capture return 0/false (2.6.32 kernel emu10k1 chip).
May I drop the question in if this state can be considered valid
Yes.
and besides *playback* and *capture* elements there's a third group of *neutral* elements?
Those are elements where the simple mixer code doesn't know the direction (because the driver author didn't put "Playback" or "Capture" into the name).
Ok, but I wonder how to interpret this state in which both functions return zero.
1) There's a bug or uncertainty somewhere in the libs/driver and in a perfekt world this would not happen. It always should be either.
2) This is intentional and the respective element belongs to the group of *general* elements which exists in parallel to the *playback* and the *capture* element groups.
As mentioned alsamixer-qt4 considers 1) and handles it somehow gracefully. I just wonder if that is the correct thing to do in case.