Tejun Heo escribió:
> Yeah, apparently.
>
> 00:02.0 PCI bridge [0604]: ATI Technologies Inc RS480 PCI-X Root Port
> [1002:5a34]
>
> So, there are two broken PCI bridges.  Argh....  Okay, please try the
> attached patch.  It includes both 5a34 and 5a3f.
>
> Thanks for your patience.
>
>   
No problem, is you who i'm bottering so my computer works right!

It isn't working:
...
[   89.098980] Kernel command line: 
root=UUID=5875415d-590b-47be-8e7c-30e4c073c6d2 ro
...
[    5.816000] ACPI: PCI Interrupt 0000:00:12.0[A] -> GSI 22 (level, 
low) -> IRQ 21
[    6.820000] ahci 0000:00:12.0: AHCI 0001.0100 32 slots 4 ports 3 Gbps 
0xf impl SATA mode
[    6.820000] ahci 0000:00:12.0: flags: 64bit ncq ilck pm led clo pmp 
pio slum part
[    6.820000] ata1: SATA max UDMA/133 cmd 0xF88A0D00 ctl 0x0 bmdma 0x0 
irq 222
[    6.820000] ata2: SATA max UDMA/133 cmd 0xF88A0D80 ctl 0x0 bmdma 0x0 
irq 222
[    6.820000] ata3: SATA max UDMA/133 cmd 0xF88A0E00 ctl 0x0 bmdma 0x0 
irq 222
[    6.820000] ata4: SATA max UDMA/133 cmd 0xF88A0E80 ctl 0x0 bmdma 0x0 
irq 222
[    6.820000] scsi0 : ahci
[    6.820000] PM: Adding info for No Bus:host0
[    7.132000] ata1: SATA link down (SStatus 0 SControl 300)
[    7.132000] scsi1 : ahci
[    7.132000] PM: Adding info for No Bus:host1
[    7.616000] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[   37.616000] ata2.00: qc timeout (cmd 0xec)
[   37.616000] ata2.00: failed to IDENTIFY (I/O error, err_mask=0x104)
[   38.440000] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[   68.440000] ata2.00: qc timeout (cmd 0xec)
[   68.440000] ata2.00: failed to IDENTIFY (I/O error, err_mask=0x104)
[   69.264000] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[   99.264000] ata2.00: qc timeout (cmd 0xec)
[   99.264000] ata2.00: failed to IDENTIFY (I/O error, err_mask=0x104)
[  100.088000] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
[  100.088000] scsi2 : ahci
[  100.088000] PM: Adding info for No Bus:host2
[  100.400000] ata3: SATA link down (SStatus 0 SControl 300)
[  100.400000] scsi3 : ahci
[  100.400000] PM: Adding info for No Bus:host3
[  100.712000] ata4: SATA link down (SStatus 0 SControl 300)
[  100.712000] SB600_PATA: IDE controller at PCI slot 0000:00:14.1

The same errors than before, but I think MSI is being disabled now, or 
well, trying at least:

[    3.700000] PCI: MSI quirk detected. PCI_BUS_FLAGS_NO_MSI set for 
0000:00:02.0 subordinate bus.

May be it disables MSI for some other device/bridge/what ever:

[    5.812000] r8169 Gigabit Ethernet driver 2.2LK loaded
[    5.812000] ACPI: PCI Interrupt 0000:02:06.0[A] -> GSI 21 (level, 
low) -> IRQ 20
[    5.812000] eth0: RTL8169sc/8110sc at 0xf8840800, 00:16:17:c3:b8:f9, 
IRQ 20
[    5.816000] ahci 0000:00:12.0: version 2.0
[    5.816000] ACPI: PCI Interrupt 0000:00:12.0[A] -> GSI 22 (level, 
low) -> IRQ 21

I attach the boot log so you can check this, because I don't know 
anything about this.

Matías