I have a RME Hammerfall PCMCIA card (CardBus) with a Multiface I on a current Windows 11 PC. It works happily through Windows drivers, also ASIO (Cakewalk BandLab / Sonar).

However, I cannot get the "jack" audio server (e.g. used by Ardour) to work with the intended "portaudio" ASIO driver.
There is distorted output to the card without any application running that loosely follows audio input but gets chopped up (ring modulator sound). This looks to me like there is a "disagreement" in the buffer memory layout e.g. interleaved vs. block.

Settings are aligned between "jack" and the driver's control panel e.g. 48 kHz, 4096 samples and I think I have exhausted the obvious knobs like non-realtime mode (but please prove me wrong...)

Is this, by any chance, a known issue with a workaround?