I will stay prepared for any testing or debugging that might be requested by
anyone of you guys (but it might take a week, as the reader belongs to someone
else), such a warning could have saved lots of time for each one of us.

And, only for your files, I made a mistake in the first E-Mail I wrote Ludovic:
It's not a Cherry ST-1044U, but a Cherry XX44 smartcard reader (ST-1044U seems
to be the USB-Descriptor)

The debug-output of scdaemon can be found here:

http://pastebin.kruton.de/21/src

And I do have write permission on the device.