Comment # 15 on bug 73530 from Alex Deucher

(In reply to comment #13)
> One other question, how does MS Windows figure out the correct modelines
> when the EDID of the monitor is incorrect? (I did not try the shipped
> Windows 8 at all but assume it works.)

It's not incorrect, you can have multiple modes with different clocks for
saving power.  E.g., when the system is idle for a while, switch to the lower
clocked mode.