linux-kernel - Re: [BISECTED] HP G7000 battery disappears after suspend

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Date:	Thu, 9 Jul 2009 22:11:30 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Jenkins <alan-jenkins@...fmail.co.uk>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Len Brown <lenb@...nel.org>
Cc:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pavel Machek <pavel@....cz>
Subject: Re: [BISECTED] HP G7000 battery disappears after suspend

On Thursday 09 July 2009, Alan Jenkins wrote:
> 2009/7/8 Bartlomiej Zolnierkiewicz <bzolnier@...il.com>:
> > On Wednesday 08 July 2009 21:41:17 Rafael J. Wysocki wrote:
> >> On Wednesday 08 July 2009, Alan Jenkins wrote:
> >> > Hi,
> >> >
> >> > I've borrowed this laptop for a few days.  Linux works pretty well,
> >> > but I found a problem on newer kernels.  After suspend it claims the
> >> > battery has been removed.  E.g. /proc/acpi/battery/BAT0/state claims
> >> > the battery is not present (but it is).
> >> >
> >> > I've attached acpidump and dmidecode output at
> >> > <http://bugzilla.kernel.org/show_bug.cgi?id=13745>.  I still have
> >> > access to the laptop for further tests, but only until Friday.
> >> >
> >> > I bisected it to the commit below.  Manually reverting the patch fixes
> >> > the problem (in both 2.6.30 and 2.6.31-rc2).
> >>
> >> Well, the commit below can't be reverted, because that would cause the boxes
> >> it fixed to stop working.
> >>
> >> Now, the only case this patch can make any difference is when the BIOS doesn't
> >> set SCI_EN before returning control the the kernel, which quite evidently is a
> >> BIOS bug.  The fact that the battery doesn't work with this patch applied means
> >> that the BIOS not only doesn't set SCI_EN, but also expects it to remain unset,
> >> which is insane.
> >>
> >> IMO this is a "won't fix", sorry.
> >
> > Lets be pragmatic here..
> >
> > Besides this is a regression and we are already handling some such insane
> > systems in STR case.  Moreover sending SMI ACPI_ENABLE command may result in
> > some things happening behind our back and not only setting of SCI_EN bit..
> >
> > PS Looking at the set_sci_en_on_resume quirk history it seems that if we are
> > lucky we may may fix another issue (screaming IRQ one) at the same time :)
> >
> > Alan, could you try this patch?
> >
> > ---
> > debug patch (needs to have both CONFIG_SUSPEND=y & CONFIG_HIBERNATION=y)
> >
> >  drivers/acpi/sleep.c |   13 ++++++++++++-
> >  1 file changed, 12 insertions(+), 1 deletion(-)
> >
> > Index: b/drivers/acpi/sleep.c
> > ===================================================================
> > --- a/drivers/acpi/sleep.c
> > +++ b/drivers/acpi/sleep.c
> > @@ -383,6 +383,14 @@ static struct dmi_system_id __initdata a
> >                },
> >        },
> >        {
> > +       .callback = init_set_sci_en_on_resume,
> > +       .ident = "Hewlett-Packard HP G7000 Notebook PC",
> > +       .matches = {
> > +               DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
> > +               DMI_MATCH(DMI_PRODUCT_NAME, "HP G7000 Notebook PC"),
> > +               },
> > +       },
> > +       {
> >        .callback = init_old_suspend_ordering,
> >        .ident = "Panasonic CF51-2L",
> >        .matches = {
> 
> Thanks for coding this up for me in full.  It works, the battery now
> survives, and it does indeed remove the IRQ warning.

Great, thanks for testing, Bart, thanks for the patch!

Len, can you add the Bart's patch to your 2.6.31 queue, please?

> I didn't test the hibernation hunk.  I have hibernation set up, but
> there is a different problem (not a regression).  I don't have much
> more time to investigate on this laptop, so I don't expect to get it
> fixed.  But here are some details anyway :-).
> 
> When I run s2disk, it writes the image out, and then instantly
> resumes.  It doesn't seem to read the image, but neither does the
> kernel report an error:
> 
> [  491.088802] ACPI: Preparing to enter system sleep state S4
> [  491.090498] PM: Saving platform NVS memory
> [  491.094638] Disabling non-boot CPUs ...
> [  491.094867] PM: Creating hibernation image:
> [  491.096015] PM: Need to copy 114990 pages
> [  491.096015] PM: Normal pages needed: 114990 + 1024 + 22, available
> pages: 144595
> [  491.096015] PM: Hibernation image created (114990 pages copied)
> [  491.096015] ACPI: Waking up from system sleep state S4
> 
> It happens on 2.6.24-23-generic, 2.6.30, and 2.6.30-rc2.

Hmm.  Interesting.

I _guess_ this problem is ACPI-related as well.  You can try putting
'shutdown method = shutdown' into /etc/suspend.conf (or whatever the s2disk's
configuration file is on your system).

If possible, it would be interesting to see if that also happens if
'echo disk > /sys/power/state' is used to trigger hibernation instead of
s2disk.  In particular when booted with init=/bin/bash.

Best,
Rafael
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