I believe the Linux kernel's default configuration is to filter out these commands (so your webserver doesn't set a password for you :) -- see e.g. http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/ata /libata-scsi.c?id=HEAD#n3043
(Though I'm a bit confused, that's in the libata code, and I don't see libata loaded on my laptop...) Try adding libata.allow_tpm=1 to the kernel command line via's grub edit-command option, and see if this changes the situation. Thanks ** Changed in: hdparm (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1245255 Title: IO-Error when trying to change the master password of a self encrypting ssd To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/hdparm/+bug/1245255/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs