[linux-audio-user] via82xx and jackd

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Subject: [linux-audio-user] via82xx and jackd
From: Keith Parkins (keith_AT_rochesterpunk.com)
Date: Wed Jan 21 2004 - 17:48:41 EET

Hi,

1) I'm using alsa 1.0.1 with the latest version of jackd on a via kt400
mobo (VT8377) and a VT8233 audio controller. I have the low-latency/premp
kernel patches as well as the capabilities patch applied to a 2.4.22
kernel. I get xruns like crazy that average around 0.09 msecs when running
jackd in duplex mode. These disapear when running in either capture or
playback mode. I had seen that there may be some issues with the via82xx
chipset and jackd on the alsa list, but no solutions or description of
what the actual problems were. Am I stuck in a duplex-free zone or is
there a way to work around this? Will this affect my ability to use ardour
as multitracking device using the mic/line-in, or will it only cripple my
ability to use other programs as jack slaves?

2) Even with the capabilities patch, I get the following error when
running jack as a normal user:

JACK: unable to mlock() port buffers: Operation not permitted
cannot set thread to real-time priority (FIFO/20) (1: Operation not
permitted)
cannot use real-time scheduling (FIFO/10) (1: Operation not permitted)

Any ideas?

Thanks!
Keith

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