On Fri, 2017-12-22 at 17:56 +0100, Hans de Goede wrote:
Hi All,
As part of:
https://fedoraproject.org/wiki/Changes/ImprovedLaptopBatteryLife
I'm pushing a change to the Fedora Rawhide kernel to enable the new
med_power_with_dipm sata link powermanagement policy by default on
mobile Intel chipsets (Laptops, NuCs, etc.).
The good news about this change is that on laptops using a sata disk
it will typically save about 1W - 1.5W of power when the laptop is idle.
The bad news is that the min_power policy is known to cause data corruption
with some disks (has been reported with older sandisk ssds and some crucial
ssds). The new med_power_with_dipm sata lpm policy mirrors the default
Windows IRST lpm settings, so it should be safe to use, but the proof is
in the pudding.
I've done a blog post a while back asking users to test
this:
https://hansdegoede.livejournal.com/18412.html and here is a list
of successfully tested systens + disks:
https://fedoraproject.org/wiki/Changes/ImprovedLaptopBatteryLife#How_To_Test
So far no problems have been reported but if you're running rawhide now
would be a good time to make sure your backups are in order before
upgrading to the next rawhide kernel.
TL;DR: The next rawhide kernel build contains SATA changes which _may_
cause disk corruption, they shouldn't, but please check your backups
before updating.
This would be more appropriate on the Test list, many of whose members
do not read the Users list.
poc