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Subject: Re: Failure to shutdown/reboot with intel_iommu=on
To:     Lenny Szubowicz <lszubowi@redhat.com>,
        Joerg Roedel <jroedel@suse.de>
Cc:     linux-kernel@vger.kernel.org, rafael.j.wysocki@intel.com,
        tglx@linutronix.de, x86@kernel.org,
        Lu Baolu <baolu.lu@linux.intel.com>
References: <20200506144558.GA4019@taurus.defre.kleine-koenig.org>
 <20200508150734.GP8135@suse.de>
 <ff5eb4e2-89a3-57a5-c6d6-42bf743e5d16@redhat.com>
From:   =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= <uwe@kleine-koenig.org>
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Message-ID: <638e7da2-b61c-6636-a030-b8737bc12347@kleine-koenig.org>
Date:   Mon, 11 May 2020 21:58:10 +0200
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From: =?UTF-8?Q?Uwe_Kleine-K=c3=b6nig?= <uwe@kleine-koenig.org>
To: Lenny Szubowicz <lszubowi@redhat.com>, Joerg Roedel <jroedel@suse.de>
Cc: linux-kernel@vger.kernel.org, rafael.j.wysocki@intel.com,
 tglx@linutronix.de, x86@kernel.org, Lu Baolu <baolu.lu@linux.intel.com>
Message-ID: <638e7da2-b61c-6636-a030-b8737bc12347@kleine-koenig.org>
Subject: Re: Failure to shutdown/reboot with intel_iommu=on
References: <20200506144558.GA4019@taurus.defre.kleine-koenig.org>
 <20200508150734.GP8135@suse.de>
 <ff5eb4e2-89a3-57a5-c6d6-42bf743e5d16@redhat.com>
In-Reply-To: <ff5eb4e2-89a3-57a5-c6d6-42bf743e5d16@redhat.com>

--1wpiMQMPKJLAipprXnp1UG4ZHEGCgU041
Content-Type: text/plain; charset=utf-8
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Content-Transfer-Encoding: quoted-printable

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/firmw=
are.

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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