Re: AHCI power saving (was Re: Ten hours on X60s)

[Alan]

On Mon, 13 Nov 2006 10:32:24 -0500
Jeff Garzik <jeff@xxxxxxxxxx> wrote:

> Therein lies a key problem.  Turning on all of AHCI's aggressive power 
> management features DOES save a lot of power.  But at the same time, it 
> shortens the life of your hard drive, particularly hard drives that are 
> really PATA, but have a PATA<->SATA bridge glued on the drive to enable 
> connection to SATA controllers.

We already detect PATA over SATA so we can trivially address that (the
knobble check). Similarly we can turn ALPME on using a timer so it kicks
in after long idle periods only, or tie it to laptop mode.

For a laptop type environment with SATA not bridged PATA turning it on is
clearly the right thing to do.

Alan

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/