Re: Sata link_power_management_policy questions

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On 06/22/2009 12:50 PM, Patrick Voegeli Olivera wrote:
Hi there,

I have a laptop with Sata set to native mode and ahci enabled in the
bios. In ubuntu, I can see
/sys/class/scsi_host/host0/link_power_management_policy for host0, host1
and host2, but if I read any of those using cat they always will return
max_performance, even if I echo min_power or medium_power and it gives
no errors:

root@patrick-laptop:~# cat
/sys/class/scsi_host/host0/link_power_management_policy
max_performance
root@patrick-laptop:~# echo min_power >
/sys/class/scsi_host/host0/link_power_management_policy
root@patrick-laptop:~# cat
/sys/class/scsi_host/host0/link_power_management_policy
max_performance

I've tried to look around for a solution, but I haven't found anything
useful. Is this a feature that depends on the HDD? Does the hard drive
need to be sata 2/300 or should it also work with sata 1/150? Is it just
that my laptop doesn't support it?

Since my HDD is sata150, I've tried with another HDD and I had the same
problem. I don't know if it was sata2 compliant, though.

My laptop has intel chipsets. Namely, the 965gm (with x3100 graphics)
northbridge and I think it has a ich8 southbridge.

Any ideas on what to try?

Please post your dmesg output and hdparm -I output for the drive. Also cc-ing linux-ide.
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