On 14 Dec 2001, Kenneth Jacker wrote:

>   wp> On my IBM Thinkpad I had to add the intern_disp/extern_disp
>   wp> options to the "Device" section in the X config file. E.g.:
>
>   wp> Section "Device"
>   wp>       Identifier     "NeoMagic"
>   wp>       VendorName     "MagicGraph 256 AV 48K"
>   wp>           Option     "hw_cursor"
>   wp>           Option     "intern_disp"
>   wp>           Option     "extern_disp"
>   wp> EndSection
>
> Werner:
>
> Not sure I ever thanked you for the letter ... was madly preparing for
> a presentation, so it might have slipped my mind.  Anyway, thanks!
>
> As it turns out, the above made no difference.  I still am unable to
> have *both* a laptop (Dell Latitude CPx, RH7.0) and projected screen
> image (*simultaneously*. It works fine, unfortunately, using M$ Windoze.
>
> If you or anyone else has other ideas, I'm all ears!

I have a CPxJ, and I have been investigating this problem.  It turns out
that there is a design misfeature in the CPxJ's ATI Rage M1 video
subsystem that precludes getting acceptable video on both internal and
external ports.  There is a Dell KB article about displaying full-motion
video that outlines the issue.  Dell's solution is to disable simultaneous
hardware-driven display on both ports.  The Windows driver for the Rage M1
gets around this problem (in most circumstances)  using a software-driven
display for the second port.

I have contacted Marc Aurele La France, the XFree86 ATI driver maintainer,
and we are in the process of trying to develop a patch (he writes and I
test).  I'll report back when/if we are successful.

-- 
                Matthew Saltzman

Clemson University Math Sciences
[EMAIL PROTECTED]
http://www.math.clemson.edu/~mjs




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