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

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Date:	Thu, 1 Nov 2007 10:25:00 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	linux-kernel@...r.kernel.org
Cc:	jeff@...zik.org, kristen.c.accardi@...el.com,
	linux-ide@...r.kernel.org
Subject: Re: Suspend to ram regression (2.6.24-rc1-git)

On Thu, Nov 01 2007, Jens Axboe wrote:
> On Thu, Nov 01 2007, Jens Axboe wrote:
> > On Wed, Oct 31 2007, Jens Axboe wrote:
> > > Hi,
> > > 
> > > My x60 stopped suspending about two days ago. It just freezes after
> > > printing
> > > 
> > > Suspending console(s)
> > > 
> > > where it would normally turn everything off and the 'moon' light would
> > > go on. Posting this message in case somebody else knows what is up, if
> > > not I'll do a bisect on it tomorrow.
> > 
> > Did the bisect, it points to this commit:
> > 
> > 1556594f913fa81d008cecfe46d7211c919a853 is first bad commit
> > commit 31556594f913fa81d008cecfe46d7211c919a853
> > Author: Kristen Carlson Accardi <kristen.c.accardi@...el.com>
> > Date:   Thu Oct 25 01:33:26 2007 -0400
> > 
> >     [libata] AHCI: add hw link power management support
> > 
> > Booting any kernel after this commit fails suspending to ram, it just
> > sits there forever.
> 
> 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,
>  };

I should also mention that just stubbing out ahci_enable_alpm() and
ahci_disable_alpm() in ahci.c is NOT enough to make it work.

-- 
Jens Axboe

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