On Thu, Mar 21, 2002 at 05:14:18PM +0100, Rafael Laboissiere wrote:
> Hello,
>
> This must be a stupid question, but I am completely lost and searching
> through the mailing list archives did not help.
>
> I have installed alsa 0.9 beta10 in my Debian sid system using the ens1370
> driver. Playing sound files is working perfectly. However, recording with
> the microphone results also into a silent file. The microphone is working
> well, since I hear at the speakers what I speak into the mic. With
> alsamixer, I unmuted everybody, put all volume levels around 75%, and
> switched everything that I could to "capture". The output of amixer is
> enclosed below.
>
> What am I missing here?
>
> --
> Rafael Laboissiere
Try giving the mic a +5v Bias, and turning on the 30 dB boost:
amixer cset numid=44,iface=CARD,name='Mic +5V bias' on
amixer cset numid=42,iface=MIXER,name='Mic Boost (+30dB)' on
note that I had to change the source a bit to get rid of some
annoying clicking (not related to either of the above options)..
patch below, in case you have the same problem: (will the alsa
devs look in to this, please?)
diff -rHU 5 alsa-driver-0.9.0beta11.orig/alsa-kernel/pci/ens1370.c
alsa-driver-0.9.0beta11/alsa-kernel/pci/ens1370.c
--- alsa-driver-0.9.0beta11.orig/alsa-kernel/pci/ens1370.c Thu Feb 14 11:40:33
2002
+++ alsa-driver-0.9.0beta11/alsa-kernel/pci/ens1370.c Tue Feb 19 13:38:06 2002
@@ -880,11 +880,11 @@
spin_lock_irqsave(&ensoniq->reg_lock, flags);
ensoniq->ctrl &= ~ES_ADC_EN;
outl(ensoniq->ctrl, ES_REG(ensoniq, CONTROL));
outl(ES_MEM_PAGEO(ES_PAGE_ADC), ES_REG(ensoniq, MEM_PAGE));
outl(runtime->dma_addr, ES_REG(ensoniq, ADC_FRAME));
- outl((ensoniq->c_dma_size >> 2) - 1, ES_REG(ensoniq, ADC_SIZE));
+ outl((ensoniq->c_dma_size >> 2), ES_REG(ensoniq, ADC_SIZE));
ensoniq->sctrl &= ~(ES_R1_LOOP_SEL | ES_R1_MODEM);
ensoniq->sctrl |= ES_R1_INT_EN | ES_R1_MODEO(mode);
outl(ensoniq->sctrl, ES_REG(ensoniq, SERIAL));
outl((ensoniq->c_period_size >> snd_ensoniq_sample_shift[mode]) - 1,
ES_REG(ensoniq, ADC_COUNT));
--
Zinx Verituse
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