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[gaoshen <matthewgao@xxxxxxxxx>]

Find a way to workaround.

I have a PowerEdge R620 which installed a Ubuntu 12.04 TLS. And I found
the screen refreshing became very slow. So I share the same issue with
yours.

First,then we have to install vesa driver:
sudo apt-get install xserver-xorg-video-vesa
 
Then, for some of the Ubuntu release don't have a xorg.conf, so I have to generate one with following steps:

1.switch to console mode: Alt+Ctrl+F1
2.kill x server: sudo service lightdm stop
3.generate new xorg.conf file: sudo X -configure -- this will create xorg.conf.new file in your current dir
4.rename and move: sudo mv xorg.conf.new /etc/X11/xorg.conf
5.open /etc/X11/xorg.conf, replace the graphic driver of 'mga' with 'vesa'.t
6.return to GUI: sudo start lightdm


** Attachment added: "Capture.PNG"
   https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1316035/+attachment/4317967/+files/Capture.PNG

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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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