I am having exactly the same issue as this on two brand new Dell
PowerEdge R360 which I am setting up for the first time. This server is
also certified for use with 14.04 LTS
http://www.ubuntu.com/certification/hardware/201207-11432/

I tried to apply Zoltan's hack but ended up with a system that won't
boot. I guess this is something to do with the fact that Grub is using
the framebuffer otherwise I can't see how the changes would stop even a
text screen appearing.

In the end I installed 12.04 which works almost flawlessly (resizing
windows is still painfully slow). However given these are new servers I
would like to start them off with the latest LTS.

Zoltan if you read this please could you give any hint why we are
getting different results with the hack?

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https://bugs.launchpad.net/bugs/1316035

Title:
  matrox g200eR2 is unclaimed in 14.04

Status in “xorg-server” package in Ubuntu:
  Confirmed

Bug description:
  On a certified Dell PowerEdge T620 server
  (http://www.ubuntu.com/certification/hardware/201207-11426/)

  The matrox video card is not recognised:
  lspci | grep VGA
  0a:00.0 VGA compatible controller: Matrox Electronics Systems Ltd. G200eR2

  lshw -C display
    *-display UNCLAIMED     
         description: VGA compatible controller
         product: G200eR2
         vendor: Matrox Electronics Systems Ltd.
         physical id: 0
         bus info: pci@0000:0a:00.0
         version: 00
         width: 32 bits
         clock: 33MHz
         capabilities: pm vga_controller bus_master cap_list
         configuration: latency=64 maxlatency=32 mingnt=16
         resources: memory:d8000000-d8ffffff memory:deffc000-deffffff 
memory:de000000-de7fffff

  Thus xserver is not hardver accelerated.

  Also /dev/dri and /dev/dri/card0 is missing.

  kernel module mga is not loaded, although if i manually load by modprobe it 
works fine
  modprobe mga
  lsmod | grep mga
  mga                    40811  0 
  drm                   302817  1 mga

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