Quoth BaronH:
> Nope. You can turn Secure Boot off on the Lenovo Yoga models that this affects.
> They have the SSD in some strange "RAID" mode where Linux can't see or be installed to it, and neither can Windows unless you add some drivers to your Windows installer media. They removed AHCI mode from the BIOS. Then they wrote additional code so if you try to toggle it to AHCI mode with an EFI variable from EFIshell, it immediately sets itself back to RAID.
> For the last 11 months, they were silent on why this machine was configured this way. The only reason we know why now is because Lenovo answered my Best Buy review by stating it is locked due to the agreement they signed with Microsoft for the Signature Edition PC program, so it's very likely that all Ultrabooks in the Microsoft Store, and some outside the MS Store (such as at Best Buy) will eventually be configured so that Linux can't be installed, even if there are some now where you can install Linux.
> So consider "Signature Edition" a warning label that means "You aren't allowed to run Linux, per Microsoft.".
[2] http://www.theverge.com/2016/1/16/10780876/microsoft-windows...
Maybe because good-old-IDE or even AHCI was too simple and open.