linux-kernel - Re: [Regression] Commit "tpm: Introduce function to poll for result of self test" breaks suspend

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Date:	Mon, 16 Jan 2012 23:05:15 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Stefan Berger <stefanb@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
Subject: Re: [Regression] Commit "tpm: Introduce function to poll for result of self test" breaks suspend

On Monday, January 16, 2012, Stefan Berger wrote:
> On 01/16/2012 03:42 PM, Rafael J. Wysocki wrote:
> > On Monday, January 16, 2012, Stefan Berger wrote:
> >> On 01/15/2012 06:22 PM, Rafael J. Wysocki wrote:
> >>> Hi Stefan,
> >>>
> >> Hi Rafael,
> >>
> > That doesn't show anything too.
> >
> > However, after reverting the above commit I get:
> >
> > $ find /sys/devices -name caps | xargs cat
> > Manufacturer: 0x49465800
> > TCG version: 1.2
> > Firmware version: 1.2
> >
> > and system suspend works, although "find /sys/devices -name pcrs | xargs cat"
> > still doesn't show anything.
> 
> My guess is your TPM is disabled and/or deactivated and it that mode 
> doesn't like the sequence of commands we are sending to it. Well, I 
> guess the best is to revert the patch for now. I'll send a patch for this.

Thanks!

> What does
> 
> find /sys/devices -name active | xargs cat
> 
> currently show? If it shows a '0',

Yes, it does.

> can you try one other thing? Go into your machine's BIOS and find the TPM
> menu and enable/activate the device and try again the
> 'find's and suspend/resume again?

Well, so the problem with that is that it requires Windows to be installed
to change the settings (i.e. the machine has no BIOS setup as we know it).
So, practically, I really can't do that.

Thanks,
Rafael
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