Lukas Hejtmanek wrote:
>> Subject    : ata_piix: PATA UDMA/100 configured as UDMA/33
>> References : http://lkml.org/lkml/2007/2/20/294
>> Submitter  : Fabio Comolli <fabio.comolli@gmail.com>
>> Status     : unknown
> 
> ata_piix 0000:00:1f.1: version 2.10ac1
> ACPI: PCI Interrupt 0000:00:1f.1[A] -> GSI 18 (level, low) -> IRQ 18
> PCI: Setting latency timer of device 0000:00:1f.1 to 64
> ata1: PATA max UDMA/100 cmd 0x000101f0 ctl 0x000103f6 bmdma 0x0001ffa0 irq 14
> ata2: PATA max UDMA/100 cmd 0x00010170 ctl 0x00010376 bmdma 0x0001ffa8 irq 15
> scsi0 : ata_piix
> Time: acpi_pm clocksource has been installed.
> Switched to high resolution mode on CPU 0
> ata1.00: ATA-6: ST9100824A, 3.04, max UDMA/100
> ata1.00: 195371568 sectors, multi 16: LBA48
> ata1.01: ATAPI, max UDMA/33
> ata1.00: configured for UDMA/33
> ata1.01: configured for UDMA/33
> scsi1 : ata_piix
> ATA: abnormal status 0x7F on port 0x00010177
> scsi 0:0:0:0: Direct-Access     ATA      ST9100824A       3.04 PQ: 0 ANSI: 5
> SCSI device sda: 195371568 512-byte hdwr sectors (100030 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
> SCSI device sda: 195371568 512-byte hdwr sectors (100030 MB)

Does this fix your problem?

-- 
tejun