I did try a custom modeline. My xorg.conf included this:
Section "Monitor"
Identifier "aticonfig Monitor 0"
HorizSync 31-101
VertRefresh 60-160
# V-freq: 85.00 Hz // h-freq: 94.05 KHz
Modeline "1400x1050" 211.42 1400 1512 1768 2248 1050 1050 1054 1106
EndSection
Section "Monitor"
Identifier "aticonfig Monitor 1"
HorizSync 31-101
VertRefresh 60-160
# V-freq: 85.00 Hz // h-freq: 94.05 KHz
Modeline "1400x1050" 211.42 1400 1512 1768 2248 1050 1050 1054 1106
EndSection
I saw no difference with this configuration.
The thing that looks wrong to me is that the NoDDC and IgnoreEDID options are being ignored by the ATI driver. Is the syntax different? Is there some other way to get the driver to ignore the EDID?
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