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

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Date:	Wed, 20 Feb 2008 08:53:06 +0800
From:	"Jeff Chua" <jeff.chua.linux@...il.com>
To:	lkml <linux-kernel@...r.kernel.org>,
	"Jesse Barnes" <jesse.barnes@...el.com>,
	"Dave Airlie" <airlied@...ux.ie>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, linux-acpi@...r.kernel.org,
	"suspend-devel List" <suspend-devel@...ts.sourceforge.net>,
	"Greg KH" <gregkh@...e.de>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>
Subject: 2.6.25-rc2 System no longer powers off after suspend-to-disk. Screen becomes green.

On Feb 16, 2008 5:00 AM, Greg KH <gregkh@...e.de> wrote:

> > Also, I've tried CONFIG_DETECT_SOFTLOCKUP=n, but this doesn't fix it either.
>
> Ok, this looks to be something else.
>
> > Here's the last dmesg after suspend-to-disk and hang there...
> >
> > CPU 1 is now offline
> > SMP alternatives: switching to UP code
> > PM: Syncing filesystems ... done.
> > Freezing user space processes ... (elapsed 0.00 seconds) done.
> > Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
> > PM: Shrinking memory...  ^H-^Hdone (0 pages freed)
> > PM: Freed 0 kbytes in 0.10 seconds (0.00 MB/s)
> > ACPI: Preparing to enter system sleep state S4
> > Suspending console(s)
> >
> > [ ... it just hangs here ... press power-switch does the job, and
> > system is able to resume upon powering on ]
>
> Wait, this is a suspend-to-disk issue.  Totally different than the "will
> not power off" issue.
>
> Can you start a new thread on this, and add the suspend people to it?


I bisected down this one commit that causes the problem with
suspend-to-disk on Lenovo X60s (i945 chipset).

commit ba8bbcf6ff4650712f64c0ef61139c73898e2165
Author: Jesse Barnes <jesse.barnes@...el.com>
Date:   Thu Nov 22 14:14:14 2007 +1000

    i915: add suspend/resume support

    Add suspend/resume support to the i915 driver.  Moves some of the
    initialization into the driver load routine, and fixes up places where we
    assumed no dev_private existed in some of the cleanup paths.  This allows
    us to suspend/resume properly even if X isn't running.

    Signed-off-by: Dave Airlie <airlied@...ux.ie>


There where problem reverting the some i915 files with the latest
linux git pull, so I copied those i915*.{h,c} prior to this commit,
and problem went away.


Suspend-to-ram, suspend-to-disk all working now.


Thanks,
Jeff.
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