Re: edid vs. modeline
Searching for "Modeline" in the forum gave me a bit of a history of the growing influence of EDID in the driver, and why there are all these ModeValidation options.
After reading all this my suspicion grows that perhaps when EDID is enabled the driver does pretend to use one set of timings and provides that information to X (and xvidtune) but in fact uses another set of timings to actually produce an output signal. It is hard to imagine but is it possible ?
Back in the office, I will produce nice bug reports.