Re: ahci_softreset prevents acpi_power_off

[Jeff Garzik <jeff@garzik.org>]

Robert Hancock wrote:
> Faik Uygur wrote:
> > > What happens when you try to shutdown?  
> >
> > Does not shutdown and freezes.
> >
> > Hand copied last messages seen on console:
> >
> > Synchronizing SCSI cache for disk sda:
> > ACPI: PCI Interrupt for device 0000:06:08.0 disabled
> > Power down.
> > acpi_power_off called
> >   hwsleep-0285 [01] enter_sleep_state    : Entering sleep state [S5]
>
> Since you're getting to this point I think this has to be some kind of 
> BIOS interaction causing this. The only thing that happens after the 
> "Entering sleep state" is that the kernel writes to some ACPI registers 
> to tell the hardware to power down. I think some laptop BIOSes do things 
> on ACPI power down like try to park the drive heads, etc. and maybe this 
> change that you found from git bisecting is somehow interfering with it 
> doing this?
>
> Might want to check for a BIOS update first of all..

It would be interesting to try -mm, which includes ACPI support for ATA...

	Jeff



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