** Changed in: linux-oem (Ubuntu)
Status: New => Triaged
** Changed in: linux-oem (Ubuntu)
Assignee: (unassigned) => Kai-Heng Feng (kaihengfeng)
** Changed in: linux-oem (Ubuntu)
Importance: Undecided => Medium
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https://bugs.launchpad.net/bugs/1778029
Title:
Use "Medium power with Device Initiated PM" as default LPM policy for
mobile SATA devices
Status in linux-oem package in Ubuntu:
Triaged
Bug description:
===SRU Justification===
[Impact]
Intel CPU can't reach beyond Package C-State 3 (PC3). Drains lots of power.
[Test]
Check the value of
/sys/devices/pci0000:00/0000:00:17.0/ata1/host0/scsi_host/host0/link_power_management_policy.
It's med_power_with_dipm as default.
Also check the powertop, it can reach PC8.
[Fix]
Introduce a new config to let AHCI pick med_power_with_dipm for mobile
platforms.
[Regression Potential]
Medium. Some SATA devices are broken under med_power_with_dipm or min_power.
Fortunately this is for -oem kernel only, so every SATA device gets tested
before shipping to customers.
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