[linux-audio-user] Re: Re: rosegarden silent

[David Corkill]

Thank you tim and Alastair for your replies.

The problem seems to lie with getting jack (jackit 0.94) to work on my 
system.

Starting Jack with  Qjackctl gives an error message: ...

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)
12:24:50.512 Could not connect to JACK server as client.

Starting Jack from the command line < jackd -d alsa -d hw:0 > results in:

loading driver ..
creating alsa driver ... hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|rt|32bit
control device hw:0
configuring for 48000Hz, period = 1024 frames, buffer = 2 periods
Couldn't open hw:0 for 32bit samples trying 24bit instead
Couldn't open hw:0 for 24bit samples trying 16bit instead
Couldn't open hw:0 for 32bit samples trying 24bit instead
Couldn't open hw:0 for 24bit samples trying 16bit instead

after which the system monitor (KDE System Guard) lists jackd as active 
and other audio functions which are not compatible with jack do not work 
properly. However jack-reliant applications still fail to respond. For 
example starting QSynth, whether or not jackd is running, gives an error 
message: ... failed to create the audio driver (jack) ....



I will hunt about on the jack homepage for a bit and try to make sense 
of the situation, however any guidance is always appreciated.

David