From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephan Diestelhorst <stephan.diestelhorst@gmail.com>
Subject: Re: HDD not suspending properly / dead on resume
Date: Fri, 9 Jul 2010 23:47:28 +0200
Message-ID: <201007092347.29244.stephan.diestelhorst@gmail.com>
References: <201007091750.05020.stephan.diestelhorst@amd.com>
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I wrote:
>   I have an issue with suspend to RAM and I/O load on a disk. Symptoms
> are that the disk does not respond to requests when woken up, producing
> only I/O errors on all tested kernels (newest 2.6.35-rc4 (Ubuntu
> mainline PPA build)):
> 
<snip>
 
> This can be triggered most reliably with multiple "direct" writes to
> disk, I create the load with the attached script. If the issue is
> triggered, suspend (through pm-suspend) takes very long.

Attached now...

> IMHO the interesting log output during suspend is:
> [ 1674.700125] ata1.00: qc timeout (cmd 0xec)

Almighty google suggested to try "pci=nomsi", which seems to have
cured the issue for me for now. Is that plausible? I'll keep this
under observation.

Thanks,
  Stephan

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#!/bin/bash
CONC=10
BS=4096
COUNT=1024
while true; do
	for i in $(seq 1 ${CONC}); do
		dd if=/dev/zero of=zeroes_${i} oflag=direct bs=${BS} count=${COUNT} &
	done
	wait
done


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