I also run into this "HcDoneHead not written back; disabled" problem with the latest self compiled kernel 4.8.4 on debian 8. And the disappearing device is an "Eaton 5S 700" ups. It works with the last 4.7.10 without problems. So for the moment i will stick to 4.7.10.
I also run into this "HcDoneHead not written back; disabled" problem with the latest self compiled kernel 4.8.4 on debian 8. And the disappearing device is an "Eaton 5S 700" ups. It works with the last 4.7.10 without problems. So for the moment i will stick to 4.7.10.