Olá!

Tenho tido um problema com o Jack e o Firefox.
Toda vez que eu inicio o Jack e depois tento ouvir música pelo FireFox ou
assistir um vídeo no You Tube, por exemplo, eu fico sem som.
Da mesma forma, quando eu primeiro assisto algum vídeo via FireFox, se eu
tentar abrir o Jack, ele dá uma mensagem de erro e diz que alguém já está
usando minha placa de som.
Quer dizer, o que for iniciado por último fica sem som.
Alguém já teve este problema?

Segue logo abaixo log do Jack:

19:57:04.738 Patchbay deactivated.
19:57:04.804 Statistics reset.
19:57:04.968 MIDI connection graph change.
19:57:06.277 Startup script...
19:57:06.277 artsshell -q terminate
JACK tmpdir identified as [/dev/shm]
JACK tmpdir identified as [/dev/shm]
can't create mcop directory
Creating link /home/vitor/.kde/socket-UbuntuStudio.
19:57:06.618 Startup script terminated with exit status=256.
19:57:06.618 JACK is starting...
19:57:06.618 /usr/bin/jackd -R -dalsa -dhw:0 -r48000 -p256 -n2
19:57:06.624 JACK was started with PID=6838 (0x1ab6).
jackd 0.103.0
Copyright 2001-2005 Paul Davis and others.
jackd comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK compiled with System V SHM support.
loading driver ..
apparent rate = 48000
creating alsa driver ... hw:0|hw:0|256|2|48000|0|0|nomon|swmeter|-|32bit
control device hw:0
the playback device "hw:0" is already in use. Please stop the application
using it and run JACK again
cannot load driver module alsa
no message buffer overruns
19:57:06.757 JACK was stopped successfully.
19:57:06.760 Post-shutdown script...
19:57:06.763 killall jackd
jackd: nenhum processo morreu
19:57:06.828 MIDI connection change.
19:57:06.997 Post-shutdown script terminated with exit status=256.
19:57:08.845 Could not connect to JACK server as client. Please check the
messages window for more info.
JACK tmpdir identified as [/dev/shm]
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