[Bug 21857] DVI-0 Out of Range, where DVI-1 works on a FireGL.

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=21857





--- Comment #7 from Alex Deucher <agd5f at yahoo.com>  2009-10-18 12:36:22 PST ---
Some monitors prefer certain combinations of pll dividers over other even
though they produce the same target frequency.  The radeon driver has a set of
pll flags to adjust the pll divider calculations to take this into account. 
Take a look at atombios_crtc_set_pll() in atombios_crtc.c; we already adjust
the flags for certain frequency ranges and asics.  You may try setting
different combinations of those flags in atombios_crtc_set_pll().  The flags
are defined in radeon_mode.h and you can see how they interact with the pll
divider calculations in radeon_compute_pll() in radeon_diplay.c.


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