[PD] pd latency on puredyne 9.10 with Nvidia HDA

Billy Stiltner billy.stiltner at gmail.com
Sat Mar 26 11:30:59 CET 2011

Well with  the stock install of Ubuntu studio 10.10 except for the
graphics accelerator upgrade the audio was still glitching the same as
with 9.10 puredyne. So I done all the upgrades possible and  that
seemed to get the patch running without gem with a 50ms buffer.  There
is no glitching while messing with the guis in pure data like there is
in 9.10 so I'm guessing it's either a window drawing routine or
something to do with alsa or the audio codecs that got upgraded. Now
maybe I can figure out how to tinker with the alsa drivers to lower
the latency.

On 3/25/11, Billy Stiltner <billy.stiltner at gmail.com> wrote:
> From Vista I was just able to set the latency to 12ms in pd 042.5
> vanilla without loading any extra libraries besides the moog~filter
> from ggee and this did not have any audio dropouts.  This is without
> I will try this same thing with the same patch in Uuntu Studio 10.10.
> Earlier I noticed from puredyne that whenever the audio glitches the
> cpu% jumps to 1% instead of 0 for soundcard IRQ process. I tried
> setting the priority of pd and pdgui to -10 and this seemed to help a
> bit. Maybe I need to adjust the buffers for ALSA to match the buffers
> of ASIO for ALL. which is set at 512bytes with a buffer offset of 4ms.
> On 3/25/11, Billy Stiltner <billy.stiltner at gmail.com> wrote:
>> Thanks Bernardo
>> Charles
>> Possibly so.
>> I wonder if I install the SB live if it will be autodetected. and the
>> drivers are allready a part of the kernel or will I have to patch the
>> kernel or something then reinstall all the audio software. At least I
>> would determine if it is the soundcard or sound card drivers or not.

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