linux-kernel - Re: ACPI undocking on 3.8-rc5 no longer works with Lenovo T61

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Date:	Thu, 07 Mar 2013 22:48:27 +0100
From:	Zdenek Kabelac <zkabelac@...hat.com>
To:	LKML <linux-kernel@...r.kernel.org>, hmh@....eng.br,
	joe@...ches.com, toshi.kani@...com, isimatu.yasuaki@...fujitsu.com,
	rafael.j.wysocki@...el.com
Subject: Re: ACPI undocking on 3.8-rc5 no longer works with Lenovo T61

Dne 29.1.2013 11:46, Zdenek Kabelac napsal(a):
> Hi
>
> No exactly sure which patch did it - but when I'm now checking 3.8-rc5 kernel,
> I cannot use anymore this 'undock' command:
>
> echo 1 >/sys/devices/platform/dock.0/undock
>
> which works ok with 3.7 kernel - to properly undock my T61 before suspend.
>
>
> Dmesg shows this:
>
> [ 2657.087414] ACPI: \_SB_.PCI0.LPC_.EC__.BAT1: undocking
> [ 2658.613494] ata4.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
> [ 2658.613508] ata4.00: ST_FIRST: !(DRQ|ERR|DF)
> [ 2658.613522] sr 3:0:0:0: CDB:
> [ 2658.613530] Get event status notification: 4a 01 00 00 10 00 00 00 08 00
> [ 2658.613583] ata4.00: cmd a0/00:00:00:08:00/00:00:00:00:00/a0 tag 0 pio
> 16392 in
>           res 00/00:00:00:00:00/00:00:00:00:00/00 Emask 0x2 (HSM violation)
> [ 2658.613670] ata4: soft resetting link
> [ 2658.766888] ata4.00: NODEV after polling detection
> [ 2658.766900] ata4.00: revalidation failed (errno=-2)
>
>
> Here is boot log attached, my HW is Lenovo T61, C2D
>


I've run 'bisect'  and found out commit which has broken  'undock' support on
my Lenovo:

commit 8ab0ab2570cfc48303e545944f53690a6983a898
Author: Toshi Kani <toshi.kani@...com>
Date:   Tue Oct 23 01:30:26 2012 +0200

     ACPI: dock: Remove redundant ACPI NS walk

     Combined two ACPI namespace walks, which look for dock stations
     and then bays separately, into a single walk.

     Signed-off-by: Toshi Kani <toshi.kani@...com>
     Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
     Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>


After doin plain revert of this commit undock 'support' is back -
I've tested this with 3.9-rc1  (though on this kernel it seems wifi is
again horribly broken for now)

Any idea about proper fix here ?

Zdenek

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