[Nottingham] Probing the mysteries of xorg.conf

James Gibbon jg at jamesgibbon.com
Tue Apr 26 01:11:30 BST 2005

Hi all,

I'm trying to get my second PC's display to a resolution of 1280x1024.

lspci tells me the graphics card is a "Matrox Graphics, Inc. MGA 1064SG [Mystique] (rev 03)"

http://www.guru3d.com/review/mystique.html tells me the card supports 1280x1024 at a colour
depth of 16 bits/pixel.

The monitor is an Eizo F57, which has a recommended resolution of 1280 dots x 1024 lines @ 89 Hz,
and certainly used to run at that resolution on this (my main) PC.

xorg.conf invites me to 'feel free to try resolutions such as "1152x864", "1280x1024"', in a

So, I did. I plugged in the appropriate values for the card and the monitor into xorg.conf:
Section "Monitor"

    Identifier  "Eizo"

# HorizSync is in kHz unless units are specified.
# HorizSync may be a comma separated list of discrete values, or a
# comma separated list of ranges of values.

     HorizSync  30-96

# VertRefresh is in Hz unless units are specified.
# VertRefresh may be a comma separated list of discrete values, or a
# comma separated list of ranges of values.

     VertRefresh 50-160


.. and

Section "Screen"
    Identifier  "Screen 1"
    Device      "VESA Framebuffer"
    Monitor     "Eizo"

# If your card can handle it, a higher default color depth (like 24 or 32)
# is highly recommended.

   DefaultDepth 16

# "1024x768" is also a conservative usable default resolution.  If you
# have a better monitor, feel free to try resolutions such as
# "1152x864", "1280x1024", "1600x1200", and "1800x1400" (or whatever your
# card/monitor can produce)

    Subsection "Display"
        Depth       8
        Modes "1280x1024" "1152x864" "1024x768" "800x600" "640x480"
    Subsection "Display"
        Depth       16
        Modes "1280x1024" "1152x864" "1024x768" "800x600" "640x480"
    Subsection "Display"
        Depth       24
        Modes "1280x1024" "1152x864" "1024x768" "800x600" "640x480"
    Subsection "Display"
        Depth       32
        Modes "1280x1024" "1152x864" "1024x768" "800x600" "640x480"


.. however, my box steadfastly refuses to display at any other resolution than 1024x768!

/var/log/Xorg.0.log tells me:

(II) VESA(0): Supported VESA Video Modes:                            
(II) VESA(0): 720x400 at 70Hz
(II) VESA(0): 720x400 at 88Hz
(II) VESA(0): 640x480 at 60Hz
(II) VESA(0): 640x480 at 67Hz
(II) VESA(0): 640x480 at 72Hz
(II) VESA(0): 640x480 at 75Hz
(II) VESA(0): 800x600 at 56Hz
(II) VESA(0): 800x600 at 60Hz
(II) VESA(0): 800x600 at 72Hz
(II) VESA(0): 800x600 at 75Hz
(II) VESA(0): 832x624 at 75Hz
(II) VESA(0): 1024x768 at 87Hz (interlaced)
(II) VESA(0): 1024x768 at 60Hz
(II) VESA(0): 1024x768 at 70Hz
(II) VESA(0): 1024x768 at 75Hz
(II) VESA(0): 1280x1024 at 75Hz
(II) VESA(0): 1152x870 at 75Hz

.. which seems promising, but also mentions, later on::

(II) VESA(0): Total Memory: 32 64KB banks (2048kB)
(II) VESA(0): Eizo: Using hsync range of 30.00-96.00 kHz
(II) VESA(0): Eizo: Using vrefresh range of 50.00-160.00 Hz
(II) VESA(0): Not using mode "1280x1024" (no mode of this name)
(II) VESA(0): Not using mode "1152x864" (no mode of this name) 

.. anyone got any insight? I'm scratching my head at the moment! The "no
mode of this name" message would seem to be a useful clue but I couldn't
find anything particularly helpful when I googled.


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