Problem with resolution 1366x768 on Matrox G200EH with HWE kernel

[Hiro Uchi]

Hi,

I am using Ubuntu 16.04.3 LTS + HWE kernel. These are my system-details.

*kernel:*
  linux-generic-hwe-16.04             4.10.0.28.31
  linux-headers-4.10.0-28             4.10.0-28.32~16.04.2
  linux-headers-4.10.0-28-generic     4.10.0-28.32~16.04.2
  linux-headers-generic-hwe-16.04     4.10.0.28.31
  linux-image-4.10.0-28-generic       4.10.0-28.32~16.04.2
  linux-image-extra-4.10.0-28-generic 4.10.0-28.32~16.04.2
  linux-image-generic-hwe-16.04       4.10.0.28.31
*Graphics controller:*   VGA compatible controller: Matrox Electronics
Systems Ltd. MGA G200EH (rev 01)
*xserver:*   xserver-xorg 1:7.7+13ubuntu3
*mga driver:*  xserver-xorg-video-mga 1:1.6.4-1build2
*xrandr:*  version 1.5.0
*panel resolution:* 1366x768
*cvt:*
  # 1368x768 59.88 Hz (CVT) hsync: 47.79 kHz; pclk: 85.25 MHz
  Modeline "1368x768_60.00"   85.25  1368 1440 1576 1784  768 771 781
798 -hsync +vsync
*xorg.conf:*
  Section "Device"
          Identifier      "Configured Video Device"
          Driver          "mga"
  EndSection

  Section "Monitor"
          Identifier      "Atmel panel"
          Modeline        "1366x768" 75.00 1366 1404 1426 1544 768 771
777 810 +hsync +vsync
          Option          "PreferredMode" "1366x768"
  EndSection

  Section "Screen"
          Identifier      "Default Screen"
          Monitor         "Atmel panel"
          Device          "Configured Video Device"
  EndSection

*Problem:*
When I use only Ubuntu 16.04.3 LTS, above settings worked correctly.
However, after install HWE kernel, panel display was leaned around 45 degree.
( I need HWE kernel to fix other issue. )

I could set 1368x768 without lean, but this is not result I wanted.

Could you help me in solving this please?

Thanks
Hiro