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After Protest, Lenovo Releases BIOS For Loading Linux on Yoga 900, IdeaPad 710S (liliputing.com)
Lenovo received a lot of heat in September when it said the Yoga 900 and Yoga 900S hybrids would only support Windows, and not Linux. The company has now changed its stance, though there is still a catch. An anonymous reader shares a Lilputing article: But now you can install Linux, because Lenovo has released new BIOS options for those laptops. There's a bit of a catch though. Lenovo's new BIOS has an AHCI option that lets you install Linux... but if you're using the new BIOS, then Windows is not officially supported. In fact, Lenovo says it's not officially supporting the new BIOS either... if you want to install it, you're pretty much on your own if you run into any problems. While Lenovo is presenting this as an either/or solution for choosing whether you want to run Windows or Linux. But some users have discovered that it is possible to set up dual-boot system using the new BIOS, allowing you to choose between Windows and Linux when your computer boots.
If you want to use Linux on this platform in "RAID" mode with the supported BIOS, the source code to enable it is part of this patch series from an Intel developer: http://lists.infradead.org/pip.... It's not pretty, but it sounds like that's just how the hardware works.