Bug#700598: scrambled/torn display, booting wheezy weekly amd64 CD on L850/046

[Neale Banks <neale@lowendale.com.au>]

Package: installation-reports

Attempting to boot the Wheezy weekly amd64 CD of 2013/2/11 on  a new
Toshiba L850/046 (in EFI mode, secure boot disabled) results in
scrambled display.

The machine initiates boot from the CD, displays 'Welcome to GRUB!'
then 'Warning: "prefix is not set'.

Then the display is scrambled (like video "tearing") and confined to the
upper approx 40% of the screen.

Using the up and down arows causes small changes in this scrambled/torn
display, which are consistent with small changes to a menu - i.e. it
appears the insaller may have booted OK, but just not displaying
correctly.

In the system settings, there is no obvious item for changing the
display setting(s).

Thanks,
Neale.