To complement my previous message, I have ran "hdparm -I /dev/sda" with the hdparm version from Jessie's repository.
According to this patch http://sourceforge.net/p/hdparm/patches/35/ that is supposedly included in Jessie's hdparm package, it should show an output about DevSlp when the device supports it, and in my case it doesn't show anything about it. So, according to that assumption, my device doesn't support DevSleep. Thank you very much. -- To UNSUBSCRIBE, email to debian-bugs-rc-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org