Dino, there's one other *potentially serious* matter if you're using
Intel's Brookdale chipset.

I have a NetVista I'm trying to use, and I experienced the kind of
latency problems you had, but I found drivers for the onboard video.
See
http://ubuntuguide.org/wiki/Ubuntu_dapper#How_to_install_Graphics_Driver_.28Intel.29

The NetVista I have only has two PCI slots, so I wanted to use onboard
video and save a slot. After installing the driver, the reported
latency was down at 11,000-20,000 or so most of the time.

BUT I still wound up with a ridiculous-seeming .6 to .75 millisecond
delay showing up _once a minute or so (!)_. This would mean, if I were
doing software stepping, that once a minute terrible things might
happen. Talk about *weird*.

Then I found out about the SMI interrupt problem with Brookdale chipsets.

Take a good look at
http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?FixingDapperSMIIssues .

That page mentions there's a precompiled version of the change to RTAI
available: http://wiki.linuxcnc.org/uploads/rtai_smi.ko
 I haven't followed the instructions yet but I am optimistic.

-- 
      Michael M. Butler  :  m m b u t l e r  ( a t )  g m a i l . c o m

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