Pavel Machek wrote: > Hi! > >>> This is a patch (very ugly, assumes you have just one disk) to bring >>> powersaving to AHCI. You need Alan's SCSI autosuspend (attached) patch >>> as a base. >>> >>> It saves .5W compared to config with disk spinning, and even .15W >>> compared to hdparm -y... on my thinkpad x60 anyway. >> .. >> >> There was a discussion of this here today. > > Real-life discussion, or something I could read? :-). > >> It makes good use of AHCI-specific features. >> >> Has it been tested with a Port-Multiplier yet? > > I do not know what port-multiplier is, sorry. But it was not really > tested. It is not expected to work on any other config than notebook > very similar to mine. > >> This is cool enough that we really ought to do a hardware-independent >> version, so that all SATA interfaces could benefit. Especially ata_piix, >> but others too. > > Well, it seems like it is 10 lines per driver once Alan's SCSI > autosuspend patches are in... .. Cool (literally)! I think I might have gotten your patch confused in my mind with another AHCI patch, which uses features of the chip itself to automatically negotiate/change link power status on the fly (no s/w needed, other than to turn it on). That one is very ACPI specific, though. _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
