[quote='827025022, DTS Engineer, /thread/775317?answerId=827025022#827025022'] Have you tried using a bus analyzer [/quote] I received the analyzer today and was able to capture the packets on the USB bus. The M4 iPad Pro shows, that after some time, when the iPad is sleeping only malformed packets with the content FF are sent. See attached image. This situation does not recover after the iPad becomes awake. A M1 iPad Pro on the other hand never sends malformed packets.

[quote='827025022, DTS Engineer, /thread/775317?answerId=827025022#827025022'] Have you tried using a bus analyzer [/quote] No, as we do not have access to one. We are considering getting the Cynthion USB Protocol Analyzer. Do you think it does the job?