How to troubleshoot recording stops after five minutes

[steve]

> Have you customised your audio system in some way?

No. I don't think so. How can I tell?

I was just checking that you hadn't deliberately created a custom configuration for your audio devices. Clearly you haven't


I'm not sure exactly what is going on with your setup, but compare this (below). This is my laptop's setting, which is a default configuration in Xubuntu 18.04 LTS.

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC269VC Analog [ALC269VC Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 9: HDMI 3 [HDMI 3]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 10: HDMI 4 [HDMI 4]
Subdevices: 1/1
Subdevice #0: subdevice #0

Notice that it shows that I have similar hardware, but that on my machine the default device is:
card 0: PCH [HDA Intel PCH], device 0: ALC269VC Analog [ALC269VC Analog]

The key word is "Analog". That's the normal audio in/out of the laptop and it is the default device.
HDMI audio is connected to the laptop's HDMI port, which is only used if I connect a second monitor that has built-in speakers.

I don't know why your default device is not the analog audio in / out, but the fact that it isn't looks wrong to me.



I found this post via a Google search: https://bbs.archlinux.org/viewtopic.php?id=182023
I don't know if their steps to fix the issue will be appropriate for your machine, so don't blindly follow those steps. I'm just mentioning as there are some clear similarities:
1) Their default card appeared to be set as HDMI.
2) Their system appeared to work correctly for a few minutes and then stopped.
3) The problem appears to have been fixed by changing the default device from HDMI to the analog device.

Unfortunately I don't know enough about the sound system on KDE to guide you through this. I'd suggest that you see what you can find out about this via Google, and perhaps try asking on the Ubuntu forum.

One thing that you could try - see if the same problem occurs with kWave (https://docs.kde.org/trunk5/en/kdemulti ... rding.html)
I expect that it will, but post back and let us know either way.