[Bug 21050] Radeon driver displays nothing on DVI-0, but works fine on DVI-1

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=21050





--- Comment #13 from Alex Deucher <agd5f at yahoo.com>  2009-04-06 10:20:40 PST ---
(In reply to comment #12)
> (In reply to comment #11)
> > Coherent has nothing to do with single link vs. dual link, rather it affects
> > how the clock is recovered in the monitor.  Most new monitors prefer coherent,
> > however, that's not always the case.
> 
> Indeed, but 1920x1200 at 60Hz can't be done in non-coherent single-link, whereas
> it just fits (with reduced blank timings) in the coherent mode available
> bandwidth IIRC.
> 

The timing is the same whether you are using coherent mode or not.  Some
monitors work better with coherent mode other do not.  Does disabling coherent
mode help?


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