Hi - this is quite an old bug now. Qjackctl has moved on to 0.4.2 in
Ubuntu's latest releases now.
I have no problems using Qjackctl in Ubuntu Studio (which uses a jack-
sink to connect with Pulse Audio for desktop sounds). Then there is no
need to use ALSA directly.
I am marking this as invalid
I can confirm this. As soon as qjackctl is started, no sound output on
alsa devices is possible, even if the jack daemon is not started by
qjackctl.
I have two soundcards (one dedicated to jackd and the second for normal
system sounds) and qjackctl blocks both cards, even if I configure
qjackctl
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: qjackctl (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/880535
Title: