Hi Greg

I don't know Ubuntu's default sound system, but the error message suggests fldigi is trying to run pulseaudio? My first thought was that pulseaudio was going to into idle too fast. I had that problem with another app so I commented out;

load-module module-suspend-on-idle

from the relevant ca files in /etc/pulse

The "ret" expression failure might also suggest you have an errant server string in the fldigi config soundcard devices pulseaudio setup. Just leave it blank if you are using pulse.

I suggest first however that it would be best to ensure that your Ubuntu has whatever sound system you want to use, then make sure fldigi matches that. Current Linux OS's are generally migrating towards pipewire.

Cheers Bob VK2YQA

On 26/8/24 13:49, Greg Cheng - KC3SMW wrote:

I ran Fldigi from the terminal and noticed this happening when I changed modes.? ?Funny thing is it only happened after I keyed up once to tune.? Prior to tuning it wouldn't freeze.??

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Here is the debug output.??

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Expression 'ValidateParameters( inputParameters, hostApi, StreamDirection_In )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 1838
Expression 'ret' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 1736
Expression 'AlsaOpen( hostApi, parameters, streamDir, &pcm )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 1768

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I don't know if this is any insight but again any direction would be appreciated.? Thanks