It seems like a reasonable guess at least. I won't have a chance to dig into the details until late this evening or tomorrow, depending on when I get home tonight.

Sent from my mobile phone (pardon any lack of formatting)

-----Original Message-----
From: Rafael J. Wysocki
Sent: Saturday, July 12, 2008 13:53
To: Andy Lutomirski ; H. Peter Anvin
Cc: Andi Kleen ; Ingo Molnar ;; ACPI Devel Maling List ; LKML ; pm list ; Pavel Machek
Subject: Re: [RFT] x86 acpi: normalize segment descriptor register on resume

On Saturday, 12 of July 2008, Andy Lutomirski wrote:
> Rafael J. Wysocki wrote:
> > On Saturday, 12 of July 2008, Andy Lutomirski wrote:
> >> My Lenovo X61s fails to resume if I suspend it from within X, on both
> >> 2.6.26-rc9 and recent wireless-testing. 2.6.26-rc8 is fine, as is
> >> wireless-testing with 4b4f7280 reverted. My in-progress bisect between
> >> -rc8 and -rc9 is also consistent with this being the problem.
> >>
> >> The symptom is that, when I push the power button to resume, the hard
> >> drive light turns on, the fan turns on, then the hard drive light turns
> >> off, the sleep light stays on, and the fan keeps running. Sometimes the
> >> battery light will blink off very briefly (1/4 sec, maybe) every few
> >> seconds. The system is locked hard at this point.
> >>
> >> I'm using Ubuntu Hardy userspace.

> >
> > Well, that's bad.
> >
> > There is the bugzilla entry at
> > for this bug and you've just confirmed my suspicion that this particular
> > commit is to blame.
> >
> > Can you please see if the appended patch changes anything?

> More correctly:
> If I suspend by typing pm-suspend or echo mem >/sys/power/state, then it
> resumes just fine. If I log in to Gnome and push the suspend button,
> then it does not resume. This seems to be the case with or without your
> patch.

Is there an Intel graphics in your box?

> -rc8 and -rc9 with the original patch 4b4f7280 resume fine no matter how
> I suspend.

That's _really_ strange.

In fact I have only one explanation, which is that the Gnome suspend button
causes some user-space quirks to be applied, which are harmful and break the
resume. Also, without commit 4b4f7280 those quirks might have not been really
executed. Peter, does it sound reasonable?


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