Re: Suspend to ram regression (2.6.24-rc1-git)

[Jeff Garzik]

Jens Axboe wrote:
> On Thu, Nov 01 2007, Jeff Garzik wrote:
> > Jens Axboe wrote:
> > > Reverting just the default AHCI flags makes it work again. IOW, with the
> > > below patch I can suspend properly with current -git.
> > > diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
> > > index ed9b407..77f7631 100644
> > > --- a/drivers/ata/ahci.c
> > > +++ b/drivers/ata/ahci.c
> > > @@ -190,8 +190,7 @@ enum {
> > >   	AHCI_FLAG_COMMON		= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
> > >  					  ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
> > > -					  ATA_FLAG_ACPI_SATA | ATA_FLAG_AN |
> > > -					  ATA_FLAG_IPM,
> > > +					  ATA_FLAG_ACPI_SATA | ATA_FLAG_AN,
> > >  	AHCI_LFLAG_COMMON		= ATA_LFLAG_SKIP_D2H_BSY,
> >
> > sounds like the easy thing to do, in light of this breakage, might be to 
> > default it to off, add a module parameter turning it on by setting that 
> > flag.
>
> Wouldn't it be better to just get this bug fixed? IOW, is there a reason
> for disabling ALPM if it's Bug Free?
>
> I'd suggest committing the patch disabling IPM, then Kristen can debug
> the thing in piece in quiet. Once confident it works with ahci again, we
> can revert that commit.

Right -- if you are going to commit a patch "disabling" it, it is best 
to do so via a simple module option, which allows users to easily try 
the feature in parallel with Intel's debugging.

	Jeff



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