It would appear that DRI forces DDC monitor detection, and ignores the sync lines in the XF86Config-4 when it fails,  instead using what would appear to be internal settings.
 
X 4.3.99.6 works fine and uses the sync settings in the config.
 
Please find attached the X log, and the config ... messages showed no errors and shows the DRI kernel module loading successfully.
 
 

Attachment: XFree86.0.log
Description: Binary data

Attachment: XF86Config-4
Description: Binary data

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