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