Ubuntu 6.10  with kernel version 2.6.21-rc5 compiled with ahci support

I have a MSI K9AGM motherboard that ships with four SB600 SATA ports but 
when the kernel is booting some errors are showed and the SATA disk is 
not detected.

Here is what dmesg throws:

[    1.332000] ide: Assuming 33MHz system bus speed for PIO modes; 
override with idebus=xx
[    1.332000] ahci 0000:00:12.0: version 2.1
[    1.332000] ACPI: PCI Interrupt 0000:00:12.0[A] -> GSI 22 (level, 
low) -> IRQ 16
[    2.336000] ahci 0000:00:12.0: AHCI 0001.0100 32 slots 4 ports 3 Gbps 
0xf impl SATA mode
[    2.336000] ahci 0000:00:12.0: flags: 64bit ncq ilck pm led clo pmp 
pio slum part
[    2.336000] ata1: SATA max UDMA/133 cmd 0xf8824d00 ctl 0x00000000 
bmdma 0x00000000 irq 222
[    2.336000] ata2: SATA max UDMA/133 cmd 0xf8824d80 ctl 0x00000000 
bmdma 0x00000000 irq 222
[    2.336000] ata3: SATA max UDMA/133 cmd 0xf8824e00 ctl 0x00000000 
bmdma 0x00000000 irq 222
[    2.336000] ata4: SATA max UDMA/133 cmd 0xf8824e80 ctl 0x00000000 
bmdma 0x00000000 irq 222
[    2.336000] scsi0 : ahci
[    2.648000] ata1: SATA link down (SStatus 0 SControl 300)
[    2.648000] scsi1 : ahci
[    3.132000] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[   33.132000] ata2.00: qc timeout (cmd 0xec)
[   33.132000] ata2.00: failed to IDENTIFY (I/O error, err_mask=0x104)
[   34.112000] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[   64.112000] ata2.00: qc timeout (cmd 0xec)
[   64.112000] ata2.00: failed to IDENTIFY (I/O error, err_mask=0x104)
[   64.112000] ata2.00: limiting speed to UDMA7:PIO5
[   65.092000] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[   95.092000] ata2.00: qc timeout (cmd 0xec)
[   95.092000] ata2.00: failed to IDENTIFY (I/O error, err_mask=0x104)
[   96.072000] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[   96.072000] scsi2 : ahci
[   96.384000] ata3: SATA link down (SStatus 0 SControl 300)
[   96.384000] scsi3 : ahci
[   96.696000] ata4: SATA link down (SStatus 0 SControl 300)




lspci -vvv:

00:12.0 SATA controller: ATI Technologies Inc SB600 Non-Raid-5 SATA 
(prog-if 01 [AHCI 1.0])
   Subsystem: Micro-Star International Co., Ltd. Unknown device 7242
   Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR+ FastB2B-
   Status: Cap+ 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR-
   Latency: 64, Cache Line Size: 64 bytes
   Interrupt: pin A routed to IRQ 222
   Region 0: I/O ports at e800 [size=8]
   Region 1: I/O ports at e400 [size=4]
   Region 2: I/O ports at e000 [size=8]
   Region 3: I/O ports at dc00 [size=4]
   Region 4: I/O ports at d800 [size=16]
   Region 5: Memory at febffc00 (32-bit, non-prefetchable) [size=1K]
   Capabilities: [60] Power Management version 2
       Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA 
PME(D0-,D1-,D2-,D3hot-,D3cold-)
       Status: D0 PME-Enable- DSel=0 DScale=0 PME-
   Capabilities: [50] Message Signalled Interrupts: 64bit+ Queue=0/2 
Enable+
       Address: 00000000fee0300c  Data: 41b9
   Capabilities: [70] #12 [0010]



lshw

*-pci:0
         description: Host bridge
         product: RS480 Host Bridge
         vendor: ATI Technologies Inc
         physical id: 100
         bus info: pci@00:00.0
         version: 10
         width: 32 bits
         clock: 66MHz
       *-pci:0
            description: PCI bridge
            product: RS480 PCI-X Root Port
            vendor: ATI Technologies Inc
            physical id: 2
            bus info: pci@00:02.0
            version: 00
            width: 32 bits
            clock: 33MHz
            capabilities: pci normal_decode bus_master cap_list
            configuration: driver=pcieport-driver
       [...]
       *-storage
            description: SATA controller
            product: SB600 Non-Raid-5 SATA
            vendor: ATI Technologies Inc
            physical id: 12
            bus info: pci@00:12.0
            version: 00
            width: 32 bits
            clock: 66MHz
            capabilities: storage ahci_1.0 bus_master cap_list
            configuration: driver=ahci
            resources: ioport:e800-e807 ioport:e400-e403 
ioport:e000-e007 ioport:dc00-dc03 ioport:d800-d80f 
iomemory:febffc00-febfffff irq:222
       *-usb:0
            [...]



I'm attaching the output of the lshw, lspci -vvv and dmesg commands (all 
three of them executed as root).

Matias