[pvrusb2] default volume setting

[Mike Isely]

On Mon, 24 Jul 2006, Mark Brand wrote:

> Hi,
>
> Recently I noticed that the volume was set way too high when I use
> pvrusb2-mci-20060702 to capture. Loud voices get severely clipped and I
> have to use a much lower than normal volume setting on the TV to get a
> comfortable volume.
>
> I am pretty sure that the default volume used to be OK in previous versions.
>

    [...]


Mark:

A while back (I think kernel 2.6.15 and previous), msp3400 scaled the 
audio gain so that "maximum" worked out to be a reasonable maximumm for 
the part (apparently).  Versions of msp3400 after that point eliminated 
the scaling, so now "maximum" is simply the largest value possible that 
can be programmed into the chip.  The pvrusb2 driver doesn't attempt to 
scale this value so now the result is clipping when the volume is at the 
max.

Probably the right thing to do here is to have the pvrusb2 driver attempt 
to scale the volume as appropriate for the model / hardware since it's 
really only at that place where we know what's "right" for the entire 
combination of hardware that defines the device as a whole.  This has been 
on my to-do list for a while (look at doc/notes.txt to see the lengthy 
list), but it just hasn't been a priority for me since the workaround is 
fairly trivial (e.g. just reduce the volume).

This should be listed as a bug.  I'll see about getting the documentation 
fixed in the short term.

   -Mike



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