Public bug reported:
SRU justification:
[Impact]
When system goes to suspend-to idle, it's power consumption is around 4+ w.
[Fix]
Some TBT and other ACPI devices share the same power resource, when system goes
to s2idle.
PME polling thread continue bringing up devices to D0 mode.
Use cached ACPI device power state will avoid this issue.
[Test]
Verified on 2 hardware. Tests result are good.
[Regression Potential]
Medium, upstream patches cherry-picked.
Since these hareware is only supported by 5.0+ kernel, I set B-OEM-OSP1
and disco+ kernel tag.
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: oem-priority originate-from-1840880 sutton
** Tags added: oem-priority originate-from-1840880 sutton
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https://bugs.launchpad.net/bugs/1840882
Title:
[SRU][B-OEM-OSP1/D/E] reduce s2idle power consumption when BIOS uses
shared power resources
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