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

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Jan 12 08:26:40 PST 2010


--- 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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