linux-kernel - Re: [REGRESSION] Suspend fails because of TPM modules

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Date:	Mon, 29 Nov 2010 16:15:21 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Debora Velarde <debora@...ux.vnet.ibm.com>,
	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>,
	Marcel Selhorst <m.selhorst@...rix.com>
Cc:	linux-kernel@...r.kernel.org, tpmdd-devel@...ts.sourceforge.net,
	"Rafael J. Wysocki" <rjw@...e.com>
Subject: Re: [REGRESSION] Suspend fails because of TPM modules

On Mon, 29 Nov 2010, Jiri Kosina wrote:

> Hi,
> 
> on my thinkpad x200s (and I have seen reports on different HW as well), 
> suspend fails when TPM modules are loaded.
> 
> 	tpm_tis 00:0a: tpm_transmit: tpm_send: error -5
> 	legacy_suspend(): pnp_bus_suspend+0x0/0xa0 returns -5
> 	PM: Device 00:0a failed to suspend: error -5
> 	PM: Some devices failed to suspend
> 
> Once tpm, tpm_bios, tpm_tis and tpm modules are unloaded, suspend/resume 
> works.
> 
> This is a regression. It definitely worked on this very same hardware on 
> 2.6.34. Any kernel between .34 and .37 wasn't booted there, so I don't 
> have any data of that kind.
> 
> I can try bisecting it, but if anyone sees immediately what the culprit 
> might be, that'd be helpful.

I just found out, that if I modprobe tpm_tis module with

	itpm=1

parameter, the problem doesn't happen any more and suspend works fine.

This definitely wasn't needed on older kernels though, so I'd consider 
that still a regression.

Also, can't we make the module automatically detect the machines on which 
to apply the workaround? Let's say, based on DMI?

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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