Date: Wed, 6 Jun 2007 08:47:44 +0200
From: Tino Keitel <tino.keitel@gmx.de>
To: linux-kernel@vger.kernel.org
Subject: Bad behaviour after hdparm -M  128
Message-ID: <20070606064744.GA14552@dose.home.local>
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Hi,

I tried to enable acoustic management on my SATA drive, because
hdparm -I reported a recommended value of 128, and a current value
of 0 (off).

I did this:

$ sudo hdparm -M 128 /dev/sda
/dev/sda:
 setting acoustic management to 128
 HDIO_DRIVE_CMD:ACOUSTIC failed: Input/output error
 acoustic      = not supported

It apperently failed, no big deal.

However, I had these messages in the kernel log, and they don't look
really harmless to me:

ata3.01: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
ata3.01: cmd ef/42:80:00:00:00/00:00:00:00:00/50 tag 0 cdb 0x0 data 0 
         res 51/04:80:00:00:00/00:00:00:00:00/50 Emask 0x1 (device error)
ata3.01: configured for UDMA/133
ata3: EH complete
SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: write cache: enabled, read cache: enabled, doesn't support DPO or FUA

Is this expected behaviour?

I used kernel 2.6.21 with the libata PIIX SATA driver and a
Seagate ST98823AS drive.

Regards,
Tino
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