On Sat, 17 Oct 2015 18:44:40 +0000 Fons Adriaensen <fons@xxxxxxxxxxxxxx> wrote: > On Sat, Oct 17, 2015 at 07:24:02PM +0100, Will Godfrey wrote: > > On Sat, 17 Oct 2015 13:58:37 -0400 > > Ivica Ico Bukvic <ico@xxxxxx> 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 > > That's what killall or pkill will do anyway, so > I don't think this is a solution. > > I also don't think that Jack is involved. You'd > probably get the same effect when unplugging the > USB device while some ALSA app is using it. > > There is a similar problem with the hdsp-madi module, > and it has hit me a number of times when installing > the card in a new system. Apparently the default > configuration expects an external clock, and when > that isn't connected any process that uses the device > hangs and can't be killed. The first process to do so > will be alsactl, called as part of the boot sequence. > And since that will be called again as part of reboot > or poweroff, those will hang as well. The only thing > you can do to pull the power plug, remove the card, > boot, edit the file used by alsactl, switch off, put > the card back and boot. > > Ciao, > Interesting. I just tried this on my 'office' machine with a KA6 and it worked, albeit the response was like treacle! I wonder if the fact that the default motherboard sound was *not* disabled might have had some bearing on it. -- 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. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
