SAMSUNG SSD 830 Series not automatically going to standby or sleep

No matter how I configure my Samsung SSD, it does not automatically

enter a standby or sleep mode. It does with with hdparm -y/-Y

manually, but that's the only way. And of course during the next

reader it's automatically activated again. hdparm -B is "not

supported", hdparm -S does not seem to have any effect, with 1/253/254

settings. I've used lm-profler to find and stop any accesses to the

disk.



I'm using the sata_sil24 driver with a Sil 3531 SATA controller and as

stated a SAMSUNG SSD 830 with firmware CXM03B1Q. By the way, hdparm -I

tells me that it doesn't support DIPM, unfortunately. I've tested

Linux kernels up to 2.8-rc2.



The reason it's important to me is that I found out the system uses >1

W less power with the SSD in standby mode. And while the SSD uses less

power during disk access, the disk idle power usage is actually higher

now than previously with my plain old spinning hard disk.



Mostly I post fixes, this is just a problem I have. I would appreciate

any hints in the comments. Thanks!