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[愛新覺羅闓勳 <northeastwolf@xxxxxxxxxxx>]

Same problem with a Dell PowerEdge R720, video card Matrox Electronics Systems Ltd. G200eR2
I try many ways but no one can be work fine with the ubuntu 14.04 ,
when i google the G200eR2's driver, i found a solution with this card, remove the mga driver!

sudo apt-get remove xserver-xorg-video-mga

it will remove the xserver-xorg-video-mga and xserver-xorg-video-all
then reboot 
now the window not slowly, and screen only has a 800x600 @75hz , but it work fine

i hope this way can help other people

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Packages, which is subscribed to xorg-server in Ubuntu.
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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