Re: I hate Alsa

["应富鸣" <fmying@gmail.com>]

On 9/13/07, Barry Samuels <barry@realbritain.f2s.com> wrote:
> Debian Testing up to date as of yesterday.
> Kernel 2.6.22
> Sound from on-board Intel (snd_hda_intel)
> Kmix as the mixer
>
> When I used OSS I had no audio problems at all - everything (playback
> and recording) just worked but since I went over to Alsa (about a year
> ago) I've had trouble getting recording to work.
>
> Normally I find that playback gives no problems and I did for a short
> period get playback and recording working properly then after a Debian
> upgrade the recording stopped working properly again.
>
> If I try to record (arecord) using a microphone I cannot move the
> recording volume slider above 70% otherwise I start getting extremely
> distorted sound on playback (aplay) and although the recording volume
> is adequate there is a loud background hum. If I reduce the recording
> volume to about 60% the loud hum changes to a noticeable hiss but the
> recorded voice is too low.
>
> I have to use the 'Digital' slider on the Kmix input tab to control
> microphone volume - none of the other sliders seem to do anything. I
> also have to have the first capture slider on (un-muted) to get any
> sound at all but it makes no difference whether that slider is at the
> bottom or not - it does not affect the volume.
>
> I also have a record deck with a USB connection which I last used under
> OSS. The setup was working then and, as I remember, it was pretty
> straightforward to set up. Since that time there have been many
> Debian updates and I'm almost certainly using a later kernel and I'm
> now using Alsa.
>
> When I came to use it this time in conjunction with Audacity, which I
> was using last time, I can't get a peep out of it.
>
> I have tried various inputs without success. The appropriate modules
> are loaded including snd_usb_audio.
>
> When the USB lead is plugged in I get this in the logs:
>
> kernel: usb 1-7.1: new full speed USB device using ehci_hcd and address
> 6
> kernel: usb 1-7.1: configuration #1 chosen from 1 choice
> kernel: input: Burr-Brown from TI
> USB Audio CODEC  as /class/input/input4
> kernel: input: USB HID v1.00 Device [Burr-Brown from TI
> USB Audio CODEC ] on usb-0000:00:1d.7-7.1
> kernel: usbcore: registered new interface driver snd-usb-audio
>
> a little further on in the log I see:
>
> kernel: cannot submit datapipe for urb 0, error -28: not enough
> bandwidth
>
> Originally I got this in the log:
>
> kernel: cannot submit datapipe for urb 0, error -38: enable
> CONFIG_USB_EHCI_SPLIT_ISO to play through a hub
>
> so I enabled that in the kernel and recompiled although I'm not using a
> USB hub and then got the 'not enough bandwidth' error.
>
> As you may have gathered I'm beginning to take a dislike to Alsa.
>
> Can anyone suggest some fault tracing procedures please?
>
> --
> Barry Samuels
> http://www.beenthere-donethat.org.uk
> The Unofficial Guide to Great Britain
>
>

I use ALSA on KDE(Lenny), and krecord is used to record sound from microphone.
It works fine. I can hear the sound clearly.
Maybe it's the problem of your mixer that it was not configured fine?