安裝了ubuntu 12.04後，回復asus ux31a的方法： Press ESC at booting, select EFI DVD, that's it. Note: Since at the installation of ubuntu, I have rewritten the sda1 partition, which contains EFI booting information, I have to switch to the recovery DVD that I made. The factory default recovery partition is on sda5, which is kept intact in my HD. One silly question though, why would one switch back to Win7 when it is a lot happier using ubuntu? Asus ux31a fine tune note from ubuntu documentation