linux-kernel - Re: Failure to shutdown/reboot with intel

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Message-ID: <638e7da2-b61c-6636-a030-b8737bc12347@kleine-koenig.org>
Date:   Mon, 11 May 2020 21:58:10 +0200
From:   Uwe Kleine-König <uwe@...ine-koenig.org>
To:     Lenny Szubowicz <lszubowi@...hat.com>,
        Joerg Roedel <jroedel@...e.de>
Cc:     linux-kernel@...r.kernel.org, rafael.j.wysocki@...el.com,
        tglx@...utronix.de, x86@...nel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: Re: Failure to shutdown/reboot with intel_iommu=on

Hello Lenny,

On 5/11/20 3:43 PM, Lenny Szubowicz wrote:
> I suspect that you have TPM 2.x functionality enabled in the BIOS/firmware.

Indeed.

> Unless you are actually using the TPM, try setting it to TPM 1.2 mode.
> I've seen an incompatiblity on other Lenovo laptops between using the
> IOMMU, TPM 2.x implementation in firmware, and shutdown/suspend.

When setting it to TPM 1.2 reboot works again. Didn't test poweroff and
suspend/resume yet.

Best regards
Uwe



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