radeon 8500 mergedfb flicker

[Benjamin Herrenschmidt]

On Thu, 2004-12-02 at 16:52 +1100, Dave Airlie wrote:
> > Are you sure the 1152x864 mode is actually being used?  the mode
> > validation doesn't seem to like it.  you may have to add it as a
> > modeline in your monitor section.
> > 
> 
> Yep the monitor is correct...
> 
> I also swapped over CRT1 and CRT2 so the flat panel is now the first
> monitor and the CRT is the second one, the flickering always happens
> on whatever is connected to the DVI output, the VGA output is always
> rock solid..

Can you try hacking the bit of code that calcs PLL values for P2PLL so
that it never picks up odd post divider values ? that's a known issue
with the external TMDS transmitter (though it would only affect real DVI
afaik, not analog).

Also, I spotted a bug in the bandwidth calculation code that may trigger
with some specific vram setups, I yet have to post a patch tho.

Ben.