I tried to boot on new Asus MB, which supports BIOS, UEFI and secure UEFI boot
ubuntu-12.04.1-desktop-amd64+mac.iso (should support UEFI)
from USB1 flash drive installed with
dd if=openSUSE-12.2-KDE-LiveCD-x86_64.iso of=/dev/sdc
I can BIOS boot Linux from SATA hard drive, but flash drive isn't listed as bootable drive in BIOS or when I press F8 after system start.
Flash drive is listed only on first screen after system start.
I was able to boot openSUSE-12.2-KDE-LiveCD-x86_64.iso from same flash drive on old MB.