Sounds like a problem with the USB device driver on your system.
On Thu, Aug 17, 2017 at 11:35 PM, James Harkins <jamshark70@xxxxxxxx> wrote:
Hi, been inactive for a while.
I just up/cross-graded to Ubuntu Studio 16.04 -- very much enjoying it so far! I'm getting better USB audio performance than I could ever manage under plain Ubuntu (provided WiFi is off, but I can live with that for shows).
One problem that the upgrade didn't solve is that sometimes jackd gets stuck and it can't be killed.
Initial symptom: No audio, in or out.
Secondary symptom: In qjackctl, the CPU usage number is frozen -- never changes.
At that point:
$ ps x | grep jackd
3140 ? SLsl 0:16 /usr/bin/jackd -dalsa -r44100 -p1024 -n2 -D -Chw:Set,0 -Phw:Set
4458 pts/1 S+ 0:00 grep --color=auto jackd
$ kill -9 3140
$ ps x | grep jackd
3140 ? SLsl 0:16 /usr/bin/jackd -dalsa -r44100 -p1024 -n2 -D -Chw:Set,0 -Phw:Set
4460 pts/1 S+ 0:00 grep --color=auto jackd
"kill -9" has no effect.
"sudo kill -9" has no effect.
If I reboot, it takes several minutes for the system to shut down -- i.e., jackd is even preventing a clean shutdown.
So, the question: How do I regain control when this happens? (Ideally, without having to close everything.)
Thanks,
hjh
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