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bbfa235
(Get the code!)
I'm not surprised that there is no 1152x864@60 mode. I don't see where that mode would come from.
There is a default mode for 1152x864@85 in the Ubuntu supplement to extramodes, however. I can't see in the log where defaultmodes are being considered. They are seen clearly with my nv driver. That's one reason I wanted to see the config file. If it is pristine, however, then it won't be at fault.
@Mantas Kriaučiūnas
Is your configuration the default one automatically installed by Hardy, without change? Was the 1152x864@85 mode available when you tried Nvidia and Intel?
Your monitor could ask, in the EDID, for a mode with a vertical refresh of >=100 Hz, but doesn't. There are no VESA established modes, as of the last document I could find, for modes >=100Hz. Therefore if any were to be included automatically they would have to come from a modeline in the extramodes source file in xorg-server. If the radeon driver isn't trying to use these default modes it won't be able to offer 1152x864@85 (or anything around or above 100Hz) unless the monitor requests the modes inclusion or a modeline is added to the configuration. Of course it could be silently trying and rejecting this mode because of some detail I'm not aware of.
I could easily be missing something here.