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From: "Jeffrey W. Baker" <jwbaker@gmail.com>
To: linux-ide@vger.kernel.org
Subject: SATA ALPM min_power causes > 10s delay on resume
Date: Sun, 24 Aug 2008 10:27:50 -0700	[thread overview]
Message-ID: <1219598870.11057.2.camel@stinkpad> (raw)

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)

After which point the machine works normally.  The SATA controller is an
Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA AHCI Controller (rev
03) and the SATA target is a SAMSUNG MCBQE32G Rev: PS10.  The kernel is
2.6.24.  I haven't tried anything newer.

If the ALPM setting is left at its default of max_performance then
resume from suspend is instant.  Is there any way to work around this?
ALPM is worth a solid 30 minutes of extra battery life, so obviously I'd
like to use it.  If nothing else, it might be helpful to have a module
parameter to shorten the timeout on known-working hardware.

-jwb


             reply	other threads:[~2008-08-24 17:28 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-08-24 17:27 Jeffrey W. Baker [this message]
2008-08-26  0:14 ` SATA ALPM min_power causes > 10s delay on resume Grant Grundler
2008-08-26  3:14   ` Jeffrey W. Baker
2008-08-26  4:04     ` Jeffrey W. Baker
2008-08-30 11:02 ` Tejun Heo
2008-08-30 18:01   ` Jeffrey W. Baker
     [not found]   ` <fd145f7d0808301059y20e91ba7w22b9ddd6c54d9554@mail.gmail.com>
2008-08-31  9:35     ` Tejun Heo
2008-09-30  0:20       ` Jeffrey W. Baker

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