I reported this to the ALSA team - Takashi Iwai suggested:

Check your /proc/asound/card0/codec97#0/ac97#0-0 file, whether it
contains "VRA" in Extended ID section.  If not, it's 48k-only codec.

This is the case with both the test systems showing the problem here, which both have AC97 on-board sound cards. If extra sound interfaces are plugged in (PCI card, USB interface) then these don't have the problem.

So this behaviour is not a bug in Debian, it is a limitation of certain sound hardware that can only do 48kHz sampling. There may be a work-around using ALSA's plug layer for software resampling, but this is unlikely to give good JACK performance.

Cheers!

Daniel


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