linux-kernel - Re: [tpmdd-devel] Linux 3.1-rc9

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Date:	Sun, 09 Oct 2011 22:29:07 -0400
From:	Stefan Berger <stefanb@...ux.vnet.ibm.com>
To:	Arkadiusz Miśkiewicz <a.miskiewicz@...il.com>
CC:	linux-kernel@...r.kernel.org, tpmdd-devel@...ts.sourceforge.net,
	Debora Velarde <debora@...ux.vnet.ibm.com>,
	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>,
	Marcel Selhorst <m.selhorst@...rix.com>
Subject: Re: [tpmdd-devel] Linux 3.1-rc9

On 10/09/2011 04:51 PM, Arkadiusz Miśkiewicz wrote:
> On Wednesday 05 of October 2011, Linus Torvalds wrote:
>> Another week, another -rc.
> suspend to ram regression is annoying (still visible on rc9;
> https://lkml.org/lkml/2011/9/24/76) but unfortunately maintainers are silent.
>
I tried -rc9 on my Lenovo W500 with that same TPM. I cannot reproduce 
the 'scheduling while atomic' problem you had reported earlier. I also 
could suspend / resume fine as long as I did the following:

- suspended with the tpm_tis driver as module in the kernel
- once a suspend was done without the tpm_tis driver the subsequent 
suspends were all done without the tpm_tis driver

Once I had done a suspend/resume with the tpm_tis driver *not* in the 
kernel and then again a suspend with the tpm_tis driver in the kernel, 
it did not resume anymore. I believe previously (previous version of 
kernel and/or Fedora) it refused to even suspend. The reason why this 
doesn't work properly is that the driver has to send a command to the 
TPM upon suspend and the BIOS then sends the corresponding wakeup command.

Did you maybe previously suspend/resume without a tpm_tis driver and 
then try to suspend with it ?

Also, my Lenovo W500 shows particularly odd behavior when I switch from 
Windows to Linux. The first suspend with a Linux booted after Windows 
(with or without tpm_tis driver) does *not* resume (reboot required). A 
subsequently rebooted Linux makes the suspend/resume work fine.

    Stefan

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