On Mon, 2008-08-25 at 20:14 -0700, Jeffrey W. Baker wrote:

On Mon, 2008-08-25 at 17:14 -0700, Grant Grundler wrote:

quoted

On Sun, Aug 24, 2008 at 10:27 AM, Jeffrey W. Baker [off-list ref] wrote:

quoted

I started using the min_power ALPM setting on my ThinkPad to save power
(which works great, thanks!) but it causes a small problem.  When the
machine resumes from suspend-to-ram it hangs for about 10s and then
prints this on the console:

ata1: COMRESET failed (errno=-16)

It then proceeds normally.  The full messages are:

ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
ata1.00: configured for UDMA/100
ata1: failed to recover some devices, retrying in 5 secs
ata1: soft resetting link
ata1: SATA link down (SStatus 611 SControl 300)
ata1: failed to recover some devices, retrying in 5 secs
ata1: hard resetting link
ata1: port is slow to respond, please be patient (Status 0x80)
ata1: COMRESET failed (errno=-16)
ata1: hard resetting link
ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)

Can you enable CONFIG_PRINTK_TIME in your kernel?

Output follows ...

quoted

It sounds like the ahci driver is having problems spinning up
the disk after putting it into a "low power state" (which I
have no clue might be). Getting more accurate time
stamps might be a useful additional clue.

The disk is an SSD so there's no need for delay to allow it to spin
up.

I just did an experiment, and a workaround for this problem is to enable
max_performance immediately before sleep and return to min_power during
resume.

-jwb