Re: Dual Head on Dell 640 ATI Radeon Mobility 7500

[Alex Deucher <agd5f yahoo com>]

It might be realted to the framebuffer size.  I bieleve the maximum
size is 2048x2048.  if you are running 1280x1024 side by side you may
be running into this limitation.  you might want to try over/under
ratehr than side by side.  or try a lower res and see if the artifacts
disappear.

Alex

--- Barry Warsaw <barry python org> wrote:
> On Friday, May 23, 2003, at 12:30 PM, Hugh Caley wrote:
> > The attached XF86Config will give me the two displays (second
> display 
> > is a Dell 1024x768 LCD attached to the laptop's VGA port).  The 
> > primary display has some artifacting but basically works.  The 
> > secondary display is terribly artifacted, with streaky repetitions
> of 
> > some of the primary display's elemenets, the cursor is a square,
> etc.  
> > Nevertheless, I can open a terminal on the primary display, drag it
> to 
> > the secondary display, and use it, even if is very difficult to
> read.
> 
> This is probably not related, and I hate to bum out an otherwise 
> successful XFree86 day, but I have long seen artifacts on my Linux 
> system.  For me the artifacts are probably not screen capturable
> short 
> of taking a picture of my screens.
> 
> The artifacts manifest themselves as ghosted vertical lines,
> snow-like 
> noise, and other fuzzy anomolies, almost as if the video card is not 
> driving the screens at the right rates.  It's much worse for the VGA 
> port than the DVI port -- and both ports are running Dell E171FP flat
> 
> panels at their native 1280x1024 resolution.  They are both pushing 
> 75Hz instead of the "optimal" 60HZ, but I don't really think that's
> the 
> problem (at one point in the RH7.3 days I had them driving at 60Hz
> and 
> it didn't help).
> 
> It could well be the card, but I'm sure it's not anything else in the
> 
> chain as I drive the same flat panels from my Radeon 8500 Mac card on
> 
> OSX and it looks great.
> 
> I'd love to hear if anybody has any clues.
> 
> -Barry
> 
> 
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