Hi Hans,
thank you very much for working on this! Forgot to give some feedback
before… I tested your packages for Fedora 27 with my ThinkPad T450s with
Crucial MX100 (512GB variant, one of the affected SSDs failing with
min_power setting) and TLP. According to powertop it saves about 1.1W in
idle compared to normal medium_power. I will do the formal test
procedure and add it to the wiki within next days.
Greetings,
Christian
On 22/12/17 17:56, 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.
>
> Regards,
>
> Hans
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