Installer LiveUSB wont boot with default boot args (Acer C720)

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On an Acer C720 Chromebook the Ubuntu installer usb medium will not boot with default args.

The screen goes black with a flashing underline cursor in the top left of the screen, no other output is displayed even with "quiet" and "splash" removed from the boot args.

I can get round this and make the installer boot by adding "mem=1500m" to the boot args and once installed it is no longer a problem and the mem= entry is not required.

The Acer C720 Chromebook is not a standard laptop, it has coreboot instead of a bios and in order to install anything other than chromeos I had to enable SeaBIOS legacy support inside coreboot.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: installation-report (not installed)
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic i686
ApportVersion: 2.14.1-0ubuntu3
Architecture: i386
CurrentDesktop: Unity
Date: Sun May 11 18:50:43 2014
InstallationDate: Installed on 2014-05-11 (0 days ago)
InstallationMedia: It
SourcePackage: installation-report
UpgradeStatus: No upgrade log present (probably fresh install)