Dear List,
having a Compaq Presario notebook in front of me, running Debian testing and a 2.6.18-4-686 kernel, i have a strange DC offset when trying to record audio via the mic/line input. As the audacity level meters suggest, it resides at -30dBFS. Audio comes through and gets recorded though, but the offset severely limits the headroom of course. The sensitivity of the line/mic input seems to be quite high, although i have the mic boost setting turned off of course. Setting the module option ac97_quirk=yes did not help either. Can it be that a soundcard of this strange behavior is manufactured, or is it an alsa/driver issue? I really don't want to install another M$ operating system to check if it works there, so any help is deeply appreciated.
lspci lists the device as: 00:07.5 Multimedia audio controller: VIA Technologies, Inc. VT82C686 AC97 Audio Controller (rev 20)
regards, PP
PS: please CC: me, as i am not subscribed to alsa-devel (yet)