** Summary changed: - PC SN720 NVMe WDC 256GB consumes more power in S2Idle than long idle + PC SN720 NVMe WDC 256GB consumes more power in S2Idle than during long idle
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-oem in Ubuntu. https://bugs.launchpad.net/bugs/1805775 Title: PC SN720 NVMe WDC 256GB consumes more power in S2Idle than during long idle Status in HWE Next: New Status in linux-oem package in Ubuntu: In Progress Bug description: [Impact] On new systems that facilitate s2idle, we observed the power consumption raises higher than long idle does during s2idle with Western Digital PC SN720 NVMe SSD SDAPNTW-256G. Short idle: 5.3 Long idle: 3.0 S2I: 5.07 [Fix] Windows doesn't put nvme to D3 in modern standby, and uses its own APST feature to do the power management. To leverage its APST feature during s2idle, we can't disable nvme device while suspending, too. So, here is what we did on the driver, 1. prevent nvme from entering D3, 2. prevent nvme from being disabled when suspending. [Test] Verified on the WD NVMe, it fixes the power consumption issue with no regression. And the power consumption decreases to 1.66W during s2idle. [Regression Potential] Low, the patches only applied to specific nvme module, and from our test, the system is still stable. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1805775/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
