I think I found at least a workaround: the strange behaviour disappears immediately, if I disable
UAS, and use usb-storage for the externel USB drive.

options usb-storage quirks=04e8:4001:u

I am sure that UAS has been used with kernel 6.1, too, where it did not cause any issues...

Ideas what is going wrong in kernel 6.6? I'd like to re-enable UAS, because UAS is about 200 MB/sec
faster than usb-storage


regards, Michael

-- 
Michael Reinelt [off-list ref]
Ringsiedlung 75
A-8111 Gratwein-Straßengel
+43 676 3079941