[PlanetCCRMA] No Qjackctl, jackd from CLI works fine

[Rui Nuno Capela]

Henrik Frisk wrote:
> Hi all,
> 
> After some issues with Qjackctl (crashes) it no longer wants to start
> but issues the following:
> 
> JACK compiled with System V SHM support.
> loading driver ..
> SSE2 detected
> apparent rate = 48000
> creating alsa driver ... hw:1|hw:1|1024|4|48000|2|2|nomon|swmeter|-|32bit
> control device hw:1
> configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 4 periods
> ALSA: final selected sample format for capture: 16bit little-endian
> ALSA: use 4 periods for capture
> ALSA: final selected sample format for playback: 16bit little-endian
> ALSA: cannot set channel count to 2 for playback
> ALSA: cannot configure playback channel
> cannot load driver module alsa
> no message buffer overruns
> 22:40:40.243 JACK was stopped successfully.
> 22:40:40.244 Post-shutdown script...
> 22:40:40.244 killall jackd
> jackd: no process killed
> 22:40:40.654 Post-shutdown script terminated with exit status=256.
> 22:40:42.406 Could not connect to JACK server as client. - Overall
> operation failed. - Unable to connect to server. Please check the
> messages window for more info.
> 
> However, jackd started with the same backend (alsa) and the same
> hardware and settings works fine:
> 
> JACK compiled with System V SHM support.
> loading driver ..
> SSE2 detected
> creating alsa driver ... hw:1|hw:1|1024|4|48000|0|0|nomon|swmeter|-|32bit
> control device hw:1
> configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 4 periods
> ALSA: final selected sample format for capture: 16bit little-endian
> ALSA: use 4 periods for capture
> ALSA: final selected sample format for playback: 16bit little-endian
> ALSA: use 4 periods for playback
> 
> Any ideas as to why this may be?
> 

obviously there's a difference between the way you start jackd through
qjackctl and from the command line: you set 2 as for the number of input
and output channels while on qjackctl setup--depending on your hardware
that can be, and i suspect it is, the real show-stopper. hint: fallback
to the "(default)" value, please.

cheers
-- 
rncbc aka Rui Nuno Capela
rncbc at rncbc.org