LCD monitor, DVI connection, resolution problem

I have tried to configure an Eizo L768 19" LCD monitor connected to a MSI
RS482M4-ILD motherboard with Radeon Xpress 200 chipset and built in
graphics. The motherboard has a DVI port which I want to use. I have
installed Slackware 10.2 with X.org 6.8.2 and am using the VESA driver as
the ati driver is unable to identify the graphics chipset.

The monitor is optimized for the resolution 1280x1024, but I am unable to
get more than 1024x768. I tried to install read-edid from
http://john.fremlin.de/programs/linux/read-edid/ to verify what the
monitor is capable of and got the following:

-8<---------------------------------------------------
# EDID version 1 revision 2
Section "Monitor"
# Block type: 2:0 3:ff
# Block type: 2:0 3:fd
# Block type: 2:0 3:fc
Identifier "L768"
VendorName "ENC"
ModelName "L768"
# Block type: 2:0 3:ff
# Block type: 2:0 3:fd
HorizSync 31-64
VertRefresh 59-61
# Max dot clock (video bandwidth) 110 MHz
# Block type: 2:0 3:fc
# DPMS capabilities: Active off:yes Suspend:yes Standby:yes

Mode "1280x1024" # vfreq 60.020Hz, hfreq 63.981kHz
DotClock 108.000000
HTimings 1280 1328 1440 1688
VTimings 1024 1025 1028 1066
Flags "+HSync" "+VSync"
EndMode
# Block type: 2:0 3:ff
# Block type: 2:0 3:fd
# Block type: 2:0 3:fc
EndSection
-8<---------------------------------------------------

In the above we can see the monitors horisontal and vertical refresh rates
and also the timings of a modeline for 1280x1024@60 Hz. So the graphics
card is able to see that it is connected to a monitor capable of
displaying 1280x1024@60.

In Xorg.0.log I get the following:

-8<---------------------------------------------------
(II) VESA(0): VESA VBE DDC supported
(II) VESA(0): VESA VBE DDC Level 2
(II) VESA(0): VESA VBE DDC transfer in appr. 2 sec.
(II) VESA(0): VESA VBE DDC read successfully
(II) VESA(0): Manufacturer: ENC Model: 1729 Serial#: 16843009
(II) VESA(0): Year: 2005 Week: 42
(II) VESA(0): EDID Version: 1.2
(II) VESA(0): Digital Display Input
(II) VESA(0): Max H-Image Size [cm]: horiz.: 38 vert.: 30
(II) VESA(0): Gamma: 2.20
(II) VESA(0): DPMS capabilities: StandBy Suspend Off; RGB/Color Display
(II) VESA(0): First detailed timing is preferred mode
(II) VESA(0): redX: 0.640 redY: 0.330 greenX: 0.300 greenY: 0.600
(II) VESA(0): blueX: 0.150 blueY: 0.060 whiteX: 0.313 whiteY: 0.329
(II) VESA(0): Supported VESA Video Modes:
(II) VESA(0): 720x400@70Hz
(II) VESA(0): 640x480@60Hz
(II) VESA(0): 800x600@60Hz
(II) VESA(0): 1024x768@60Hz
(II) VESA(0): Manufacturer's mask: 0
(II) VESA(0): Supported Future Video Modes:
(II) VESA(0): #0: hsize: 1280 vsize 1024 refresh: 60 vid: 32897
(II) VESA(0): Supported additional Video Mode:
(II) VESA(0): clock: 108.0 MHz Image Size: 376 x 301 mm
(II) VESA(0): h_active: 1280 h_sync: 1328 h_sync_end 1440 h_blank_end 1688 h_border: 0
(II) VESA(0): v_active: 1024 v_sync: 1025 v_sync_end 1028 v_blanking: 1066 v_border: 0
(II) VESA(0): Serial No: F6600105
(II) VESA(0): Ranges: V min: 59 V max: 61 Hz, H min: 31 H max: 64 kHz, PixClock max 110 MHz
(II) VESA(0): Monitor name: L768
-8<---------------------------------------------------

Resolutions 720x400 - 1024x768 get listed, but 1280x1024 gets mentioned in
another way as "Future Video Modes". What does this mean?

Later in the log, different modes get listed like this:

-8<---------------------------------------------------
*Mode: 114 (800x600)
-8<---------------------------------------------------

The above is an example of a mode which I am able to use, it is marked
with an asterisk at the beginning of the line.

-8<---------------------------------------------------
Mode: 11a (1280x1024)
-8<---------------------------------------------------

The above is probably the mode that I would like to use, but it isn't
marked with any asterisk. Some modes get an explanation why they cant be
used:

-8<---------------------------------------------------
*(II) VESA(0): Not using built-in mode "640x400" (vrefresh out of range)
-8<---------------------------------------------------

However, 1280x1024 doesn't get any such explanation.

Later down in Xorg.log I get the following:

-8<---------------------------------------------------
(II) VESA(0): Total Memory: 1024 64KB banks (65536kB)
(II) VESA(0): My Monitor: Using hsync range of 31.00-64.00 kHz
(II) VESA(0): My Monitor: Using vrefresh range of 59.00-61.00 Hz
(II) VESA(0): Not using mode "1280x1024" (no mode of this name)
(--) VESA(0): Virtual size is 1024x768 (pitch 1024)
(**) VESA(0): *Built-in mode "1024x768"
(**) VESA(0): *Built-in mode "800x600"
(**) VESA(0): *Built-in mode "640x480"
(--) VESA(0): Display dimensions: (380, 300) mm
(--) VESA(0): DPI set to (68, 65)
(II) VESA(0): Attempting to use 60Hz refresh for mode "1024x768" (117)
(II) VESA(0): Attempting to use 60Hz refresh for mode "800x600" (114)
(II) VESA(0): Attempting to use 60Hz refresh for mode "640x480" (111)
-8<---------------------------------------------------

Why does it say "no mode of this name" for 1280x1024? What was wrong with
mode 11a? I have also tried to manually enter modelines to xorg.conf, but
this didn't help.

Does anyone have any ideas?

regards Henrik
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