Public bug reported: ===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. ** Affects: linux-oem (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1778029 Title: Use "Medium power with Device Initiated PM" as default LPM policy for mobile SATA devices To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-oem/+bug/1778029/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs