i have an ASUS S56C. It came pre-installed with Windows 8. I disabled Secure Boot from the BIOS and installed Ubuntu Linux 13.04 via LiveUSB flash drive. The installation succeeded, however afterwards I was unable to boot up properly. In fact, the drives just were not being seen whatsoever in the BIOS. I noticed a pattern through experimenting... If I installed Ubuntu on a drive with an MBR table, it installed and booted fine. If I installed Ubuntu on a drive with a GPT table, it installed fine but wouldn't be visible to the BIOS to boot afterwards.
While on one hand, I could use MBR, I'd really like to figure out how to get GPT working. Some discussions with both Windows channels and Linux channels reveals one similarity - everybody believes that the operating system has nothing to do with it, and that the issue is largely between the BIOS and the hardware itself. For what it's worth, I did successfully flash the latest BIOS without issue.
I tried several different partitioning schemes but have yet to find one that worked using GPT as my partition table. I set a 1MiB partition, unformatted, and flagged it as bios_grub, but that did nothing. I also tried to set a separate /boot partition @ 500MB, but that too did nothing. Overall, GPT was an instant road block, whereas MBR worked fine. But.... why? Does anybody have any idea as to why this is or what I can do to get GPT working?