[LAU] Jackd options -H --hwmon and -M --hwmeter for ice1712 -- what does it do?

Brett McCoy idragosani at gmail.com
Fri Aug 27 19:36:29 UTC 2010

On Fri, Aug 27, 2010 at 3:29 PM, Niels Mayer <nielsmayer at gmail.com> wrote:

> Finally reading the jackd manpage again (
> http://linux.die.net/man/1/jackd ) I notice
> ////// ////////// ///////// ///////// ////// ///////
> -H, --hwmon


> I've had this option set forever in qjackctl, and I haven't seen
> anything particularly special going on. The digital monitor outputs
> that can be mixed via envy24control(1) or
> http://mudita24.googlecode.com  (see screenshots) are available as
> "catpure_11" and "capture_12" whether or not this option is given to
> jackd.

I've used both M-audio and RME devices with ALSA + Jack and have never
used this setting. In fact, I was told once (on IRC or maybe on this
list) to not use it if I have hardware than can do zero-latency

> PS: likewise what does the "-M, --hwmeter" option do -- again I don't
> see any difference between this being on or off. And how would it know
> of the vagaries of the ice1712's metering, the fact that it's a peak
> meter registering 0 to -48.1dbFS? I'd imagine other hardware metering
> (RME? MOTU) might have have DSP-based RMS metering, and a totally
> different architecture than:
> http://nielsmayer.com/envy24control/envy24mixer-architecture.png

Same here... don't see what it actually provides. hdspmixer (and
previously envy24control) is what I use for all of my monitoring
needs. :-)

Brett W. McCoy -- http://www.electricminstrel.com
"In the rhythm of music a secret is hidden; If I were to divulge it,
it would overturn the world."
    -- Jelaleddin Rumi

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