Ubuntu
udisks2 package

  1. Bug #1281588
  2. Comment #37

Comment 37 for bug 1281588

Revision history for this message
Phillip Susi (psusi) wrote :

hdparm -Y puts the drive to SLEEP, not STANDBY. In SLEEP mode, no commands at all, including hdparm -C can be issued, so even trying that causes it to be woken up. Use hdparm -y instead.

I had tried patching the kernel to emulate the check power status command in software when the kernel knows it has ordered the drive to SLEEP to avoid this, but I don't think the patch was accepted upstream and I kind of forgot about it.

Also try killing your udisks task and see if that allows the drive to auto standby.