linux-kernel - Re: 2.6.21-rc1: T60 ACPI issues

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Date:	Wed, 1 Aug 2007 18:55:10 +0300
From:	"Michael S. Tsirkin" <mst@....mellanox.co.il>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	"Michael S. Tsirkin" <mst@....mellanox.co.il>,
	Hugh Dickins <hugh@...itas.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	len.brown@...el.com, linux-acpi@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>, mingo@...hat.com,
	linux-pm@...ux-foundation.org, ibm-acpi-devel@...ts.sourceforge.net
Subject: Re: 2.6.21-rc1: T60 ACPI issues

> Quoting Henrique de Moraes Holschuh <hmh@....eng.br>:
> Subject: Re: 2.6.21-rc1: T60 ACPI issues
> 
> (CC changed from Borislav to ibm-acpi-devel).
> 
> On Wed, 01 Aug 2007, Michael S. Tsirkin wrote:
> > > > 2. Pressing Fn/F4 does not trigger suspend to ram
> > > >    This normally triigers ACPI event which triggers suspend to RAM on Ubuntu
> > > >    (echo mem > /sys/power/state works)
> > > 
> > > I'll bet this is your CONFIG_THINKPAD_ACPI_INPUT_ENABLED=y.
> > > I got the same, see my "THINKPAD_ACPI_INPUT_ENABLED seems regressive"
> > > mail to Henrique and lkml an hour ago.
> 
> [...]
> 
> > > > 3. After suspend to RAM, system wakes up but laptop's screen is blank,
> > > >    switching VTs etc does not help.
> > > >    External screen wakes up OK though.
> > > >    dmesg output from boot attached.
> > > 
> > > (I've not had that.)
> > 
> > Bingo.
> > sudo rmmod thinkpad_acpi cures both 2 and 3.
> > Thanks for pointing this out.
> 
> I can see how it would help with (2), as that prompty tells the firmware to
> issue its default ACPI events for Fn+F4 upon removal.  But I have *NO* idea
> what thinkpad_acpi might be doing that is causing issues with the wake up
> after a resume.

My guess is that upon resume, I normally get some other acpi event
which gets blocked with CONFIG_THINKPAD_ACPI_INPUT_ENABLED.

> Please open a bug in bugzilla.kernel.org about it, and attach the full debug
> output of a suspend+resume cycle with and without thinkpad-acpi loaded.
> 
> Also, please try the same with thinkpad-acpi loaded, but
> CONFIG_THINKPAD_ACPI_INPUT_ENABLED set to N.  If the problem goes away,
> please retest, but set hotkey_enable to 1 and do an "cat
> /sys/bus/platform/devices/thinkpad_acpi/hotkey_recommended_mask >
> /sys/bus/platform/devices/thinkpad_acpi/hotkey_mask" before the sleep.

what's hotkey_enable?

> You will probably need to enable a bunch of debug options in ACPI and
> thinkpad-acpi to get good enough logs.  It is probably worth posting the
> acpid logs too: the real difference might be there.

-- 
MST
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