Finally had the opportunity to figure this out yesterday; I have a working Sabayon 14.01 installation on my X220 now
mediamgl wrote:From what I have been able to ascertain, I need to manually partion the drive and add the boot loader manually as well.
I'll try hitting up the Sabayon forums first, they claim to support this config out of the box.
So, I hit up the Sabayon Live Chat and the only response that I received was "Try the forums"; which I searched and found to be unhelpful in this instance. I also looked through a ton of Gentoo support pages, but didn't get too far.
Then I found a few pages about installing OS X on the X220. Some of these folks were experiencing the same issue that I encountered. It turns out that there are a few things in the X220 BIOS that need to be tweaked (in the menus) to switch "Legacy Mode" off entirely. Once the X220 is completely in UEFI mode, Sabayon set-up GPT and the necessary /boot/efi configs automatically.
So, it's only been a few hours of play, but hardware seems to be working using default settings. I haven't enabled the fingerprint scanner or the 3G WAN yet. I must say that I do like the Sabayon thus far!
If anyone has questions, let me know.