linux-kernel - Re: 2.6.25-rc2 System no longer powers off after suspend-to-disk. Screen becomes green.

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Date:	Thu, 21 Feb 2008 00:49:41 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	"Jeff Chua" <jeff.chua.linux@...il.com>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"Dave Airlie" <airlied@...ux.ie>, linux-acpi@...r.kernel.org,
	"suspend-devel List" <suspend-devel@...ts.sourceforge.net>,
	"Greg KH" <gregkh@...e.de>
Subject: Re: 2.6.25-rc2 System no longer powers off after suspend-to-disk. Screen becomes green.

On Thursday, 21 of February 2008, Jesse Barnes wrote:
> On Wednesday, February 20, 2008 3:03 pm Jesse Barnes wrote:
> > On Wednesday, February 20, 2008 2:32 pm Jesse Barnes wrote:
> > > On Wednesday, February 20, 2008 11:10 am Jeff Chua wrote:
> > > > On Feb 21, 2008 2:53 AM, Jesse Barnes <jesse.barnes@...el.com> wrote:
> > > > > > So, next I'll try "shutdown" to see if it work. I was using
> > > > > > "platform".
> > > > >
> > > > > Ok, that would be good to try.
> > > >
> > > > "shutdown" does power down properly. But still green on resume.
> > > >
> > > > > Looks like the AR registers are hosed, which is what I thought I
> > > > > fixed... Can you attach your i915_drv.c file just so I can sanity
> > > > > check it?
> > > >
> > > > Attached.
> > >
> > > Jeff, for the hang on suspend problem, I know suspect something else in
> > > 2.6.25-rc2 caused that.
> >
> > Looks like 2.6.25-rc1 also had broken suspend (my test was broken).  IIRC,
> > Dave and I had it working at LCA using the out of tree DRM modules on
> > 2.6.23.14 or 15...  Maybe you could give that a try?
> 
> And just to confirm that, I just tested the current DRM modules against a 
> 2.6.23.15 kernel.

In 2.6.23.x there's no second ->suspend() during hibernation, so no wonder.

I'll figure out how to work around this issue in the current mainline, but a
real fix will only be possible when we have separate callbacks for
hibernation.

Thanks,
Rafael
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