Hi, all. I've finally sat down and looked at a problem that's been
annoying me for a long time: the es1371 driver in 2.4.x does not allow
me to set the mic recording gain as high as the 2.2.x driver does.
With 2.2.20, the mixer channels SOUND_MIXER_MIC (7) and
SOUND_MIXER_RECLEV (11) can both be adjusted to control the recoding
level. The default levels are sufficient for my needs, and I can
adjust them to a much higher level.
With 2.4.17-rc1, I can only control the recording level with
SOUND_MIXER_IGAIN (12), and even setting it to the maximum 0x6464
value does not yield a satisfactory recording level. Changing
SOUND_MIXER_MIC (7) does not affect the recording level (unlike
2.2.x). Further, SOUND_MIXER_RECLEV (11) is not available for reading
My guess is that the change in 2.3.x to use the ac97_codec driver for
es1371 is the cause of this damage. Under 2.4.x, the maximum available
recording level is barely usable for my application. Does anyone have
a fix for this?
Note that when I say "recording level", I do mean recording. For later
processing. I don't mean "gain from mic to headphones".
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This archive was generated by hypermail 2b29 : Sat Dec 15 2001 - 21:00:30 EST