Hi Takashi, On Thu, Sep 07, 2006 at 12:09:05PM +0200, Takashi Iwai wrote: > > > > -- s1.sh ------------------------------------------------------------- > > > > #! /bin/sh > > > > amixer set "PCM Capture Gain" 2 > > > > amixer set "PCM Capture Gain" 0 > > > > amixer set "PCM" 0 > > > > amixer set "PCM" 80% > > > > ---------------------------------------------------------------------- > > > > > > > > -- s2.sh ------------------------------------------------------------- > > > > #! /bin/sh > > > > amixer set "PCM Capture Gain" 0 > > > > amixer set "PCM Capture Gain" 2 > > > > amixer set "PCM" 0 > > > > amixer set "PCM" 80% > > > > ---------------------------------------------------------------------- > > I used 'amixer set "PCM Capture Gain" 20' now in s2.sh only. Was this > > the plan? Result: there is now an audible crack when s2.sh is > > executed, but the volume before and after the cracks still seems to be > > the same. > > The crack doesn't matter seriously, but just the volume. The volume is the same. Why is everything assigned twice (e.g. first 0 then 2) in this test? > > I also tried something else: when I alternate between > > ---------------------------------------------------------------------- > > amixer set "PCM Capture Gain" 0 > > amixer set "PCM Capture Gain" 20 > > amixer set "PCM" 0 > > amixer set "PCM" 80% > > ---------------------------------------------------------------------- > > and > > ---------------------------------------------------------------------- > > amixer set "PCM" 0 > > amixer set "PCM" 80% > > amixer set "PCM Capture Gain" 0 > > amixer set "PCM Capture Gain" 20 > > ---------------------------------------------------------------------- > > the recording has alternating load and quiete stretches. Whatever this > > might tell us about the ADC, it looks like a bug to me: the order of > > setting the two controls shouldn't matter. Or am I confused again? > > Well, assume that "PCM Capture" and "PCM Capture Gain" are > independent. If so, the above two should result in the same state. > > If it's not independent but the register 4 & 5 take single values > (that was the behavior of your original implementation), the above two > cases must make a clear difference: in the former case, the gain is > below 0dB, and in the latter it's +10dB. Was it so through your > tests? Yes, the recording had alternating load and quite stretches, corresponding to the two settings. So both tests seem to indicate that for the AK5365 registers 4 and 5 take only a single value. Correct? > Also, it's possible that I did make a silly mistake. Put a debug > printk around ak->ops.write() in snd_akm4xxx_write() to check what > values are written to register 4 and 5. I will try this in the evening. Many thanks, Jochen -- http://seehuhn.de/
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