On Tue, 2011-11-01 at 13:31 +0800, JiSheng Zhang wrote:

Currently, there's no start/stop management in scsi cdrom driver to
spin up/down the motor do we need to implement it?

Say more ... like what you think it buys.  The auto spin down of a CD
tends to be the best power control we have and it's not even clear that
manufacturers have implemented any other useful power states.

James