I posted a message a few days ago regarding a lockup I was experiencing with my
linux system when I tried to run X 4.x in dual head mode, with my 3dfx Voodoo3
2000 PCI as primary and my ATI Rage II+ (Mach 64 GT) as secondary.  I didn't
receive a reply from the group, but I played around with it a little more
anyway.  I managed to get the two heads working together when I changed the ATI
card section to use the vesa driver instead of the ati driver.  I basically
commented out everything but the PCI bus ID, and changed 'driver' to "vesa" and
it worked.  I suppose that there's probably some accelleration that I'm not
getting, but since  my second monitor is 640x480 BW vga, I intend to use it only
for displaying a big Xclock and reading man pages while I program on the main
head so accelleration isn't that important.

I just thought someone here might like to know this, since it points out a bug
probably in the ati driver.

So a recap:

Voodoo3 2000 PCI primary
ATI Rage II+ (Mach 64 GT according to BIOS) secondary
XFree86 -configure finds both
System locks up if I try to use both cards at once (hard lock... no network or
anything).
Both cards work independantly.
DRI/DRM turned on/off makes no difference
XFree86 from Redhat 7.1 or XFree86 4.1.0 from Redhat 7.2beta both have the same
trouble
Upgraded kernel DRI/DRM modules, no luck
Added ModeLines for monitors, no luck
Once in a while, it would seem to work except the ATI head was garbled (but no
system lock).

Replaced ati driver with vesa driver and it works.

Thanks,

Mark

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