I used gtf:
gtf 1600 1280 78.25
to generate the modeline:
# 1600x1280 @ 78.25 Hz (GTF) hsync: 104.78 kHz; pclk: 229.67 MHz
Modeline "1600x1280_78.25" 229.67 1600 1720 1896 2192 1280 1281 1284 1339 -HSync +Vsync
which is well inside the specs of your monitor (and is the
fastest your card supports at that resolution without
exceeding the supported pixel clock of 230MHz, according to
your log file).
For some reason, despite the DDC finding the correct ranges
for your monitor, the server isn't using those ranges. So
you should uncomment the lines in the Monitor section:
#HorizSync 30-121
#VertRefresh 48-160
and you should add the modeline above there, and reference
it in all the appropriate Display subsections for your
screen, e.g.:
...
SubSection "Display"
Depth 16
Modes "1600x1280_78.25" "1280x1024""1024x768" "800x600" "640x480"
EndSubSection
...
You might also want to add to the Monitor section:
DisplaySize 400 300
so that your fonts come out at the right point size.
HTH,
--
Bill Gallafent.
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