2010/5/21 James Courtier-Dutton <james.dutton@xxxxxxxxx> > On 21 May 2010 07:35, Clemens Ladisch <clemens@xxxxxxxxxx> wrote: > > James Courtier-Dutton wrote: > > > >> For the cards that do have this 32bit linear value, a simple lookup > >> table is used in the kernel code to convert it to 256 step values. > > > > Which driver is this? It should be changed to use the full range. > > > > All creative and emu cards with a DSP. > They use a lookup table in the driver. > seem a bug in the lookup table of alsa-lib 20log10(1/100) = -40dB , it should return -40dB if set -40dB https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4883 snd_mixer_selem_set_playback_dB(<master element>, 0, -4000, +1) -> returns 0 snd_mixer_selem_get_playback_dB(<master element>, 0, &value) -> returns 0, sets value to -9999999 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
