This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed- bionic'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-bionic -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1759547 Title: Use med_power_with_dipm SATA LPM to save more power for mobile platforms Status in linux package in Ubuntu: Fix Released Bug description: In order to let CPU Package gets deeper C-state, we need to use power- saving SATA LPM to achieve that. This commit introduce a new config, SATA_MOBILE_LPM_POLICY: commit ebb82e3c79d2a956366d0848304a53648bd6350b Author: Hans de Goede <hdego...@redhat.com> Date: Mon Dec 11 17:52:16 2017 +0100 ahci: Allow setting a default LPM policy for mobile chipsets On many laptops setting a different LPM policy then unknown / max_performance can lead to power-savings of 1.0 - 1.5 Watts (when idle). Modern ultrabooks idle around 6W (at 50% screen brightness), 1.0 - 1.5W is a significant chunk of this. There are some performance / latency costs to enabling LPM by default, so it is desirable to make it possible to set a different LPM policy for mobile / laptop variants of chipsets / "South Bridges" vs their desktop / server counterparts. Also enabling LPM by default is not entirely without risk of regressions. At least min_power is known to cause issues with some disks, including some reports of data corruption. This commits adds a new ahci.mobile_lpm_policy kernel cmdline option, which defaults to a new SATA_MOBILE_LPM_POLICY Kconfig option so that Linux distributions can choose to set a LPM policy for mobile chipsets by default. The reason to have both a kernel cmdline option and a Kconfig default value for it, is to allow easy overriding of the default to allow trouble-shooting without needing to rebuild the kernel. Signed-off-by: Hans de Goede <hdego...@redhat.com> Signed-off-by: Tejun Heo <t...@kernel.org> "3 => Medium power with Device Initiated PM enable" is a well-balanced that can let Package enters deeper C-state. Also, Fedora already set SATA_MOBILE_LPM_POLICY=3 for their latest kernel. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1759547/+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
