Unfortunately I have to report that the *initial* problem is not solved with 4.4.62-1.g5191057-default but the one reproduced with the steps as described in comment 39 *is* solved. So I guess there is still some problem persisting. I will need to try the original "steps to reproduce" but it will take me some time to find a time slot where I don't actively need my work notebook. Investigation on the side of anyone else would be highly appreciated - kernel bug investigations using the work environment is rather expensive ;-)