Use "Medium power with Device Initiated PM" as default LPM policy for mobile SATA devices
Bug #1778029 reported by
Kai-Heng Feng
This bug affects 1 person
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux-oem (Ubuntu) |
Fix Released
|
Medium
|
Kai-Heng Feng | ||
Bionic |
Fix Released
|
Undecided
|
Unassigned |
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/
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.
Changed in linux-oem (Ubuntu): | |
status: | New → Triaged |
assignee: | nobody → Kai-Heng Feng (kaihengfeng) |
importance: | Undecided → Medium |
Changed in linux-oem (Ubuntu Bionic): | |
status: | New → Fix Committed |
Changed in linux-oem (Ubuntu): | |
status: | Triaged → Fix Released |
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Before making final decision please consider that some users experience issues with this option. For example: https:/ /bugzilla. redhat. com/show_ bug.cgi? id=1571330 , https:/ /bugzilla. redhat. com/show_ bug.cgi? id=1578072