Public bug reported:
It was raised because of a community member using a Lenovo platform
having very odd s2idle failures.
It was later debugged that it was caused by them choosing "Linux" mode
in Lenovo BIOS setup rather than "Windows" mode and then choosing
"s2idle" in /sys/power/mem_sleep.
- In "Linux" mode there is both "deep" and "s2idle" offered in
/sys/power/mem_sleep.
- In "Windows" mode there is only "s2idle" offered in /sys/power/mem_sleep.
That is by default no matter if the OEM offers S3 or S2idle
/sys/power/mem_sleep will contain "s2idle", but on AMD platforms
"s2idle" only works if the hardware has been configured properly by the
firmware. The outward indications of this being configured properly are
the FADT low power idle bit being set and the uPEP ACPI device being
populated, which is what this patch now checks for.
So now if a user has the firmware of the machine configured for S3 then
they will only see "deep" on AMD systems.
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux-oem-5.14 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Focal)
Importance: Undecided
Status: Invalid
** Affects: linux-oem-5.14 (Ubuntu Focal)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Impish)
Importance: Undecided
Status: New
** Affects: linux-oem-5.14 (Ubuntu Impish)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Affects: linux-oem-5.14 (Ubuntu Jammy)
Importance: Undecided
Status: Invalid
** Tags: amd oem-priority originate-from-1956572
** Tags added: amd oem-priority originate-from-1956572
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Impish)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.14 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Focal)
Status: New => Invalid
** Changed in: linux-oem-5.14 (Ubuntu Impish)
Status: New => Invalid
** Changed in: linux-oem-5.14 (Ubuntu Jammy)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1961646
Title:
On AMD platforms s2idle may not work w/o proper FW
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