linux-kernel - Re: Another libata error related to OCZ SSD

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Date:	Sun, 25 Jan 2009 12:08:39 +0100
From:	Lukas Hejtmanek <xhejtman@....muni.cz>
To:	Tejun Heo <tj@...nel.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Robert Hancock <hancockr@...w.ca>,
	linux-kernel@...r.kernel.org,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	linux-ide@...r.kernel.org
Subject: Re: Another libata error related to OCZ SSD

On Sun, Jan 25, 2009 at 10:00:43AM +0900, Tejun Heo wrote:
> 
> Does the following command make any difference?
> 
>  echo 0 > /sys/class/scsi_disk/h:c:i:l/manage_start_stop
> 
> The h:c:i:l part needs to be adjusted to point to the OCZ disk.  lscsi
> will show which value to use.

Well, the real problem seems to be in touching link power management policy
(it did not happen with ata_piix driver thus the driver seemed to be ok)

If I touch power management with theses commands:
echo max_performance > /sys/class/scsi_host/host0/link_power_management_policy
echo medium_power > /sys/class/scsi_host/host0/link_power_management_policy

the suspend fails.

I always restore max_performance policy before the suspend.

-- 
Lukáš Hejtmánek
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