[PD] metro and dsp error interacting

Simon Iten itensimon at gmail.com
Wed Nov 16 13:11:09 CET 2022

unfortunately i don’t know what starts the behaviour. when i had the dsp disabled the raspberry would just start up sometimes with the metro 1000 object banging out constantly. now with dsp enabled, this does not happen anymore but the metro sometimes stops. when i then look at the pd window i see a i/o error which led me to believe the two things are related.

i don’t think the raspberries have any suspend state, they merely shut down (send a black image) to the display.

> On 15 Nov 2022, at 16:30, Miller Puckette <msp at ucsd.edu> wrote:
> I've seen something slightly related, which is that if Pd is running without audio while a machine is in the "suspend" state, then when it wakes up it goes mad trying to catch up with all the elapsed time.  But other than that I've not seen Pd's non-audio timing fail the way yuo described.  Can you give a bit more detail as to what seems to bring the behavior on?
> cheers
> M
> On Mon, Nov 14, 2022 at 12:47:27PM +0100, Simon Iten wrote:
>> hi,
>> i have pd 0.52 running on a raspberry 4 for an art installation.
>> i don't need audio, so initially i disabled the dsp. i noticed that
>> occasionally a [metro 1000] that i loadbanged was banging constantly (very
>> very fast). after i enabled the dsp, this does not happen anymore. however,
>> as soon as i get an audio i/o error, the metro just stops outputting bangs.
>> is this a known bug? if so, is there some way around it? or ist this a
>> raspberry specific issue?
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