[Bug 25992] ATI Radeon 7000 video card cannot display some DVI modes

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=25992





--- Comment #4 from Alex Deucher <agd5f at yahoo.com>  2010-01-12 08:26:39 PST ---
(In reply to comment #3)
> (In reply to comment #2)
> > Argh.  fixed properly in 6a363f68415d37c302151581f2a86855dba39b67.
> 
> Because this patch eliminates the mode which has a high pixel clock, probably
> it can't meet Rod's requirement. 
> 
> Actually Rod wants to use reduced timing while mode is 1600x1200. 
> 
> Before, I clamped the pixel clock to 135Mhz in mode probe function, and this
> patch will decrease the refresh rate because pixel clock gets lower, for
> instance, 1600x1200 at 60Hz, pixel clock is 162M, when fresh rate is 50.9Hz, the
> pixel clock get 135Mhz, but this fresh rate (50.9Hz) may not be supported by
> all monitors, although a handy DELL monitor can support it.
> 

Doing that seems almost as problematic as allowing the higher clock modes to
begin with.  Digital monitors can be very picky about the clock they get. 
Seems like a better solution would be to disable modes with clocks over 135 Mhz
and let the user override them with reduced-clock modes if they work with their
system, then at least you should get a working monitor by default.


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