Heads up: SATA kernel change coming to rawhide with a (small) chance of disk corruption!
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
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
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Hans de Goede -
Patrick O'Callaghan