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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