At Mon, 16 Mar 2009 13:03:12 +0100, Andreas Mohr wrote: > > Hi, > > On Sun, Mar 15, 2009 at 10:21:17AM +0100, Andreas Mohr wrote: > > Hi, > > > > On Mon, Nov 24, 2008 at 03:35:10PM +0100, Takashi Iwai wrote: > > > At Sat, 22 Nov 2008 21:00:18 +0200, > > > Maxim Levitsky wrote: > > > > Finally, I found how to reproduce that bug, > > > > I mean to get normal volume on internal mic, I have to increase volume > > > > only on left or right channel. > > > > > > > > So, this happens always, and _only_ when recording _mono_ sound from internal > > > > mic. > > > > > > > > Since hardware doesn't support hardware mono input, tested with -D hw:0 > > > > I suspect this to be alsa-lib bug, any ideas? > > > > Happens with arecord -D plughw:0 -c1 . > > > > > > What does show with -v option? > > > > OK, I could fully reproduce this now (sorry for the delay!). > > > > Currently 2.6.28, u8.10, model acer-aspire, libasound2 1.0.17a-0ubuntu4, > > libasound2-plugins 1.0.17-0ubuntu5. > > Same microphone behaviour on 2.6.29-rc8 (additionally remembered to enable > CONFIG_SND_HDA_HWDEP for further testing!), u9.04, model acer-aspire, > libasound2 1.0.18-1ubuntu7, libasound2-plugins 1.0.18-1ubuntu4 > (yes, I've just done some monster upgrade). > > Will try to eventually analyze things using your _HWDEP-related tools. The question in the top priority is whether it's a kernel driver issue or alsa-lib converter issue. Could you check whether the sounds recorded with -Dhw (and with matching rate, format, etc) have the same noise problem at first? And, if it's about the alsa-lib conversion problem, we can reproduce without the hardware, e.g. via file plugin... thanks, Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
