[LAU] Jack hanging when a usb soundcard is disconnected

[Will Godfrey]

On Sat, 17 Oct 2015 13:58:37 -0400
Ivica Ico Bukvic <ico at vt.edu> wrote:

> Hi all,
> 
> This is a long-standing problem. While it is not intentional, sometimes 
> newcomers to jack on Linux tend to pull out the soundcard (USB) before 
> shutting down jack. This results in jack permanently hanging to the 
> point where one has to force-shutdown the machine. That is at least the 
> case on Ubuntu 14.04 (and was on 12.04) with lowlatency kernel. Trying 
> to do sudo killall -9 jackd makes no difference. Essentially, it is 
> impossible to destroy the process and reboot hangs because of it.
> 
> Any idea what can be done to minimize this problem or alleviate it 
> altogether?
> 
> Best,
> 
> Ico


a workaround is from a terminal type:

pidof jackd

you'll get a number such as 3772

then type

kill -9 3772

-- 
Will J Godfrey
http://www.musically.me.uk
Say you have a poem and I have a tune.
Exchange them and we can both have a poem, a tune, and a song.