[SOLVED] LMMS was kicked by Jack

[rghvdberg]

Recently everytime I open a LMMS project I get this error

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LMMS was kicked by JACK for some reason. Therefore the JACK backend of LMMS has been restarted. You will have to make manual connections again.

In the logs I find this :

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ERROR: subgraph starting at lmms timed out (subgraph_wait_fd=34, status = 0, state = Running, pollret = 0 revents = 0x0)

Started LMMS from the command line and noticed this:

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Carla assertion failure: "option != -1" in file CarlaEngine.cpp, line 1797
Will use LV2 X11 UI
Carla assertion failure: "fLatencyIndex == static_cast<int32_t>(j)" in file CarlaPluginLV2.cpp, line 2178

Running with pulse seems to be ok. But I want jack audio ...

Hope someone can help me fix this.

[rghvdberg]

The kicked by Jack message appears when I add a (Vestige) vst instrument.
This behaviour started after the 1.1.1 update, so it seems a new bug .
Actually the best working version for me was the beta version btw
I will try to pin down the problem.

[raboof]

Recently everytime I open a LMMS project I get this error

Code: Select all

LMMS was kicked by JACK for some reason. Therefore the JACK backend of LMMS has been restarted. You will have to make manual connections again.

In the logs I find this :

Code: Select all

ERROR: subgraph starting at lmms timed out (subgraph_wait_fd=34, status = 0, state = Running, pollret = 0 revents = 0x0)

This basically means LMMS failed to finish processing a set of frames within the deadline set by JACK.

Of course in an ideal world we'd improve LMMS so that it always responds within the deadline, for example by reducing the amount of locking/blocking in LMMS's jack process callback and tweaking thread priorities.

Failing that, though, you might have some luck by configuring JACK to be less demanding of LMMS, for example by decreasing the sample rate or increasing the frames/period or periods/buffer settings. The former will be at the expense of sound quality, the latter 2 at the expense of latency, though.

[thetotalchaos]

Set LMMS to output to ALSA. Than you can use some form of ALSA to JACK bridge. As falkTX properly stated LMMS' JACK output is gently said "beta quality"
Regarding the realtime usage, ALSA outputs in approximately 256 frames, but in order to have sort of stable JACK output from LMMS you must go to at least 1024 frames. You do the math.

[rghvdberg]

I don't really need realtime audio with LMMS. I hardly ever do recording with it.
But the thing that puzzles me is, why did it work without problems in the beta (1.0.99 I think)?

[rghvdberg]

SOLVED
I believe a borked wine install was the culprit

• Removed LMMS and wine-rt : followed last post of this thread http://linuxmusicians.com/viewtopic.php?f=47&t=13102
  in hindsight I think removing LMMS wasn't necessary
• removed ~/wine directory
• re-installed LMMS
  funny thing is that the LMMS install, which also installed lmms-vst-full, didn't pull in wine, but in LMMS windows vst of course didn't work
• installed wine-rt

It's working again

yay !