Device ICH7 for ahci driver

Hello

I have the mainboard G41M-E43 from MSI.

The Sata controller comes from the ICH7 chip, with the speed of UDMA 133.

Here is identifiers by the Pci bus:

"lspci -nn | grep SATA
00:1f.2 IDE interface [0101]: Intel Corporation NM10/ICH7 Family SATA Controller [IDE mode] [8086:27c0] (rev 01)"

So, I have connected Sata drives on it and this is no at the full speed. It was fine before, because I don't need speed into this computer.

Today, I'm looking for performance, and I can't change the speed to SERIAL ATA II:
- I have no option into the latest bios of the motherboard to specify AHCI mode
- I have tried "setpci -d 8086:27c0 90.b=40" or "setpci -s 00:1f.2 90.b=40" in the grub configuration with no effect .

I'm looking for help.

I've find your email because I have read the file
linux-source-3.2.0/drivers/ata/ahci.c .

Is it a new device for this driver ?

Have you a workaround like 'setpci ...' to change the speed of the Sata controller ?

Thanks a lot!

Regards, Yvan.
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