Re: ahci_softreset prevents acpi_power_off

[Jeff Garzik]

Tejun Heo wrote:
> Arjan van de Ven wrote:
> > I'd be interested in finding out how to best test this; if the bios is
> > really broken I'd love to add a test to the Linux-ready Firmware
> > Developer Kit for this, so that BIOS developers can make sure future
> > bioses do not suffer from this bug...
>
> As reported, this is almost a butterfly effect.  ->softreset method is
> only used during initialization and error recovery of ATA devices which
> has almost nothing to do with the rest of the system.  This is almost
> like 'changing my mixer input to line-in makes power off fail'.  (it's
> more related due to ATA ACPI stuff and maybe that's why this happens but
> I'm trying to make a point here.)

It's quite possible that the BIOS in question wants AHCI in some 
specific state at poweroff.

	Jeff



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