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Hello,

On Jul 23, 2007, at 00:38, khym@azeotrope.org wrote:
>> And - any chance to try a different monitor? Either radeonfb fails to
>> setup this particular video mode properly or there's a problem with
>> this particular radeon variant.
>
> OK, I tried a ViewSonic VX715 LCD, and it works! The monitor's 
> information
> panel says H Freq: 60.08kHz, V Freq: 56.36Hz, Pixel Clock: 101.42MHz,
> Resolution: 1280x1024. However, the screen often blanks out for 3 or 4
> seconds. I'm not sure what triggers it, but perhaps scrolling? Running
> rain(6) or worms(6) doesn't do it, but paging through a file with 
> less(1)
> often will.
...
> Preferred mode: 1280x1024 @ 60Hz
> dot clock: 108000

Hmm, this is a bit different from what the monitor reported - I guess 
the Studio Display was just more picky about its frequencies. I also 
wonder why they report 1280x1024@60Hz as preferred mode when the 
monitor supports that resolution at 75Hz.
Anyway, apparently radeonfb fails to program PLLs right on this radeon 
model, and what it produces is probably pretty close to the monitor's 
tolerance so it might oscillate between trying to display this signal 
and ignoring it. Does the monitor go into power saving mode when it 
blanks out? ( you should be able to hear the difference between 
blanking and actually turning the monitor off )

Radeonfb also said this:
> radeonfb0: No video BIOS, using default clocks
> no suitable DFP table present

please run 'ofctl -p' and post the output, maybe OpenFirmware has a 
hint here ( like PLL parameters in the radeon's device properties )

have fun
Michael
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