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Intel Core i7-3630QM UEFI boot results in corrupt display



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I am attempting to install Debian Wheezy onto my new Toshiba Satellite
S855-S5378 laptop using the beta4 debian-installer (I've tried the DVD
images and the netinst images on USB and CD).

When I boot debian-installer in Compatibility Support Module (CSM) mode,
the installer runs fine.  However, it would install grub in BIOS mode.
I need it to be in UEFI mode to allow dual booting Windows 8 (which came
pre-installed).

When I boot the debian-installer in UEFI mode, however, I just get a
flash of:

Welcome to Grub!
Error: "prefix" not set.

then the screen is all scrambled.  It appears as though a smaller
horizontal resolution is being used and the scan lines are just being
appended to each other.  So, image is squished to the stop ~40% of the
screen and the image is illegible.

Is this a UEFI issue or a Grub issue?  Any ideas on how I should proceed?

I've noticed that newer versions of grub has a commit (revno: 4412) to
"Reject invalid resolutions" in efi_gop.c.  I'm not familiar with
either either UEFI or Grub code, but that sounds promising to me.
I've checked out and compiled the debian-installer code.  Would
updating Grub to 2.00 be difficult or have bad consequences?  If this
would be the thing to do, I'd appreciate a pointer on how to build
netinst images from the compiled debian-installer; I can't seem to
find anything on how to do that.

Thanks!

- - Keith
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