Date: Sun, 09 Oct 2022 11:54:49 +0000 From: bugzilla-noreply@freebsd.org To: acpi@FreeBSD.org Subject: [Bug 263557] ACPI S3 doesn't resume on a MateBook X Pro 2021 Message-ID: <bug-263557-16045-fNInDkSkx1@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-263557-16045@https.bugs.freebsd.org/bugzilla/> References: <bug-263557-16045@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D263557 --- Comment #18 from Peter Much <pmc@citylink.dinoex.sub.org> --- Graham, there was a security flaw in TPM 2.0: After a suspend/resume one was able to circumvent TPM; this is explained in one of the BsdCon videos. To fix this flaw, TPM 2.0 does now not allow the computer to resume after a suspend, and forces a reset instead, unless it had been properly primed dur= ing the suspend. Our TPM kmod does handle this. So, if the computer has a TPM 2.0 installed = and running, one must kldload tpm, otherwise the resume cannot work. It became obvious to me when working myself thru the changelog of OpenBSD, searching for something they do differently: > Identified TPM2.0 devices and performed the 2.0-specific "suspend" > command, allowing the lenovo xlr9 and xlnano using the latest BIOS > (which added S3) to resume." Additionally this hints to something else, too: there is some issue with the S3, which apparently has been deprecated by Intel for the Gen 11 processors, and was later re-added on public demand. But I don't know the details of th= is. --=20 You are receiving this mail because: You are the assignee for the bug.=
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