The default mode when no monitor information is specified and no DDC info is obtained is 800x600. This is all fine but making this 1024x768 is non-trivial. When I increase the HorizSync range in the configuration file I get a 1152x768 mode but no 1024x768 mode according to the log. If X thinks the card can do 1152x768 why not 1024x768?
Created attachment 21243 [details] X log with specified HorizSync
Created attachment 21244 [details] X log with defaults
Fixed in master.
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