linux-kernel - "i8042: Can't reactivate AUX port" after s2ram on 3.4-rc2

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Message-ID: <1334310754.17013.YahooMailNeo@web161804.mail.bf1.yahoo.com>
Date:	Fri, 13 Apr 2012 02:52:34 -0700 (PDT)
From:	Mikko Vinni <mmvinni@...oo.com>
To:	"linux-pm@...ts.linux-foundation.org" 
	<linux-pm@...ts.linux-foundation.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	Jean Guyader <jean.guyader@...citrix.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Allen Kay <allen.m.kay@...el.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: "i8042: Can't reactivate AUX port" after s2ram on 3.4-rc2

Bug report:
    https://bugzilla.kernel.org/show_bug.cgi?id=43099

Briefly:

After s2ram the touchpad on a HP dv5 laptop doesn't work anymore.

dmesg contains this about the touchpad
Apr 11 18:00:05 koni kernel: i8042: Can't write CTR while closing AUX port
Apr 11 18:00:08 koni kernel: i8042: Can't reactivate AUX port

Full log in bugzilla with PCI and i8042 debug turned on.

Bisected to:

commit 26f41062f28de65e11d3cf353e52d0be73442be1
Author: Kay, Allen M <allen.m.kay@...el.com>
Date:   Thu Jan 26 10:25:53 2012 -0800

    PCI: check for pci bar restore completion and retry

    On some OEM systems, pci_restore_state() is called while FLR has not yet
    completed.  As a result, PCI BAR register restore is not successful.  This fix
    reads back the restored value and compares it with saved value and re-tries 10
    times before giving up.

I will try to update the BIOS on this laptop next week, hoping that it might
fix some of the s2ram issues, but other than that, maybe somebody has an idea?

Thanks,

Mikko

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