View Full Version : [ubuntu_studio] Cannot get any output from JACK

February 28th, 2012, 10:50 PM
Good afternoon everyone,

I've been experimenting with Ubuntu on various computers for about five years now, though I don't have a very technical understanding. I have one computer I built running Ubuntu 11.04 and Vista, and a laptop running only 11.04. Both have the studio packages on them (my first question is does 11.10 allow you to use any form of GNOME from a fresh install? Anywhere I read online is just about installing GNOME shell. I'm not a purist, I just tried Unity and found it very frustrating).

A year or two ago (maybe on Ubuntu 9.10?) I had my Akai LPK25 patched through my desktop, through JACK, Qsynth, Ardour, and various effects programs with it all working beautifully. I neglected it for awhile, and came back to find some error messages, and things weren't really working at all. I then took the opportunity to upgrade to 11.04 (just a few days ago, and removed then installed the studio packages. I start JACK, start QSynth, connect my keyboard to FluidSynth in the ALSA tab (as I always did before), and connect Qsynth to my output. The light shows up on QSynth when I strike a key, but no sound. The same goes for my laptop. On my laptop I just connected the mic inputs to the system output and got crazy feedback, so I can get (some form of) sound.

Any help would be greatly appreciated, I've probably just made a stupid mistake, or overlooked something along the way. If I remember when I first set it up, it was mostly guess work on my part. I also just burned an install DVD of Ubuntu Studio 11.04, if you think a fresh install would fix the issues.

P.S. Pandora won't load on my desktop's Firefox, but it will on my phone and laptop. I've uninstalled/reinstalled firefox, and manually reinstalled Adobe (I believe a solution offered on here). Still nothing. It just loads with the little circle, until it times out. Any help would also be appreciated on that problem.

March 1st, 2012, 03:13 PM

links 4 and 8 at the wiki have screenshots and details that
should help set up jackd and qjackctl. The commands below
show some of how linux kernel
IDs your soundcard. In my case, snd_ice1712 is the kernel module
used for the soundchip on the maudio card, yours will be
a bit different

bash-4.1$ cat /proc/asound/cards
0 [M2496 ]: ICE1712 - M Audio Audiophile 24/96
M Audio Audiophile 24/96 at 0xac00, irq 17
bash-4.1$ cat /proc/asound/devices
1: : sequencer
2: [ 0- 0]: raw midi
3: [ 0- 0]: digital audio playback
4: [ 0- 0]: digital audio capture
5: [ 0] : control
33: : timer

bash-4.1$ arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: M2496 [M Audio Audiophile 24/96], device 0: ICE1712 multi [ICE1712 multi]
Subdevices: 1/1
Subdevice #0: subdevice #0
bash-4.1$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: M2496 [M Audio Audiophile 24/96], device 0: ICE1712 multi [ICE1712 multi]
Subdevices: 1/1
Subdevice #0: subdevice #0


March 1st, 2012, 11:20 PM
Thanks for the reply. I followed the guide, and that caused my JACK to fail, saying overall system failed, server connection issues, etc. On my laptop, that is.