2010/10/1 Clemens Ladisch <clemens@xxxxxxxxxx> > Takashi Iwai wrote: > > Mark Brown wrote: > > > On Thu, Sep 30, 2010 at 04:09:56PM +0100, Colin Guthrie wrote: > > > > *shouldn't* use them, but at present it does and they *are* active > and > > > > used, so it's not an issue for me), the problem is rather one of > setting > > > > Master (not PCM) to 0% aka -46.5dB causes some kind of auto-mute that > > > > cuts off all sound. It shouldn't do that. > > > > > > Is this perhaps just an error in the TLV information - should it be > > > flagging that the minimim gain is mute but isn't? > > > > There is no clear (or consistent) definition in HD-audio codec, I guess. > > The HDA spec is quite clear that muting is done only with the mute bit. > > > Some chips do mute at 0 and some not. > > Those that do are violating the specification. > > But we have to support them anyway. > Colin, please tell us the IDs of your codec so that we can add a TLV > workaround to the driver. > > > Regards, > Clemens > > Actually, the softvol plugin behave as the same way as Colin describe since when the resolution is 2 , the softvol become a mute switch http://git.alsa-project.org/?p=alsa-lib.git;a=commit;h=f78af4ab0412052aabb74c9122a8d8f3ab6d45e6 So the question is why -51dB is selected as min_dB Is this value enough for S16_LE or S32_LE for hda-intel ? http://git.alsa-project.org/?p=alsa-kernel.git;a=commitdiff;h=eacbb9dba6b4c982a0217ea2c7d15db88d4fda37;hp=d91b424d6d7bda0773b6b6b606d48d089c4f5115 As those DACs support -120dB to 0dB , but the driver can actually limit the dB range to -60dB to 0dB . so the minimum volume -60dB is definitly not mute in this case why -60dB is selected ? _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
