Argh, my next reply to linux-ide failed to go through through e-mail, so I'll 
just paste it here
--

So I apparently missed two most important differences between good and bad
boots.

On Tue, Feb 26, 2013 at 09:03:48PM +0100, Jan Sembera wrote:
> [    2.877438] scsi6 : pata_atiixp                                            
>                                                                        
> [    2.881369] scsi7 : pata_atiixp                                            
>                                                                        
>                                                                               
>                                                                        
> [    2.391535] scsi6 : pata_acpi                                              
>                                                                        
> [    2.391994] scsi7 : pata_acpi                                              
>                                                                        

pata-acpi doesn't play very well with this controller. Disabling it in
kernel and rebooting (even with 3.8) provided completely working kernel.
So either this driver shouldn't bind pata-acpi and leave it on pata-atiixp
as before (some kind of blacklisting needed?), or it needs some fixing to
work nicely with this controller.

As a workaround for now, I'll just not compile PATA_ACPI into the
kernel.

00:14.1 IDE interface: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 
IDE Controller (rev 40) (prog-if 8a [Master SecP PriP])
        Subsystem: ASUSTeK Computer Inc. Device 8496
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx-
        Status: Cap- 66MHz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 32
        Interrupt: pin B routed to IRQ 17
        Region 0: I/O ports at 01f0 [size=8]
        Region 1: I/O ports at 03f4 [size=1]
        Region 2: I/O ports at 0170 [size=8]
        Region 3: I/O ports at 0374 [size=1]
        Region 4: I/O ports at f100 [size=16]
        Kernel driver in use: pata_atiixp

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https://bugs.launchpad.net/bugs/1126766

Title:
  Kernels newer than 3.5 fail to boot on Asus E45M1 (AMD E450) based
  device

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