Lee Revell wrote: > On Wed, 2006-07-05 at 23:14 +0100, James Courtier-Dutton wrote: >> Santiago Garcia Mantinan wrote: >>> Hi! >>> >>> After upgrading to 2.6.17 skype on my Creative SB AWE64 PnP started to sound >>> with really metallic voices, the speed and the tone seems similar to real >>> but the voice is really metallic. I have tracked that down a bit, but don't >>> really know what the problem is. >>> >>> I'm only able to find this problem with skype not with kiax or other similar >>> software, the problem happens with the stable skype or with the latest beta >>> they have in oss mode (they are adding alsa but that looks also broken for >>> my card). >>> >>> I've tracked that down to the changes from alsa version 1.0.11-rc2 to rc3, >>> in fact I compiled those two versions for 2.4.33-rc2 and got the very same >>> problems with 1.0.11-rc3 and later versions while 1.0.11-rc2 worked ok. >>> Also, PCI cards seem to work ok with skype and modern versions of alsa, so >>> I guess this bug could be related to awe cards, maybe all sb16 based stuff. >>> >>> After looking at the changes in my configurations for rc2 and rc3 or later >>> versions (I even tested version 1.0.12-rc1) I saw that rc2 didn't yet have >>> the new oss-plugins, so I said, ok we'll remove the oss-plugins from -rc3 or >>> later with --without-pcm-oss-plugins on configure and that'll do it. >>> >>> Wrong, after removing the oss plugins the voice I get when calling the skype >>> test is ok but I get silences in the middle of it which makes it last longer >>> than it should and continue after the "ding", also when I hear back what has >>> been recorded the tone of my voice is really much higher than it should, >>> even though the speed of it seems similar than it should. >>> >>> Well, like I said... I have only managed to find this kind of problems with >>> skype (I'd sugest you use the stable version if you want to test it) and >>> they are implementing alsa support, so if the bug only happens with skype >>> maybe it's not worth the effort, but it looks to me that this is a problem >>> that other programs may also have, and that is why I'm reporting it. >>> >>> Machines used for my tests were Pentium III and AMD K6-3, using Debian sid >>> and testing (they have alsa libs 1.0.11). >>> >>> Well, if you need more info or tests just ask for what you need. Thanks for >>> making ALSA so good. >>> >>> Regards... >> It seems that your thread has been hijacked, so I thought I would fix >> this, but telling you how to fix your problem. >> Your problem is caused by feedback. >> The "alsamixer" has many gain controls. Without seeing the output of >> amixer, it is hard to tell exactly which mixer control is set wrongly. >> Essentially, make sure that the mic gain is set to a minimum or mute on >> the playback view of alsamixer, and make sure pcm gain is set to minimum >> or mute on the capture view of alsamixer. >> >> This will ensure that feedback does not occur inside the hardware mixer >> of the sound card. > > James, > > Do you think it's significant that the behavior changed from 1.0.11-rc2 > to rc3? > > Lee > No, nothing has changed in the driver to cause this sort of problem. "really metallic voices" is most certainly a feedback problem.
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