Ha, another question that I can't really answer, but.......
have you checked in the mandrake control centre (configure my computer)->software manager->installing software to see if there is any glx graphics modules that might need to be installed (or the first thing I'd try is to open a terminal and type
which should open an additional window with a graphic of gear cog wheels turning and then tell the FPS rate in the main terminal).
Also, one of the things that I always have to do with my nvidia card (when configuring the nvidia driver settings) is to, as root (if you actually need to change anything) go into the /etc/X11/xorg.conf file and under the bit that looks like this
Quote:
# **********************************************************************
# Module section -- this section is used to specify
# which dynamically loadable modules to load.
# **********************************************************************
#
Section "Module"
# This loads the DBE extension module.
Load "dbe" # Double buffer extension
# This loads the miscellaneous extensions module, and disables
# initialisation of the XFree86-DGA extension within that module.
SubSection "extmod"
Option "omit xfree86-dga" # don't initialise the DGA extension
EndSubSection
# This loads the Type1 and FreeType font modules
Load "type1"
# Load "speedo"
Load "freetype"
# Load "xtt"
# This loads the GLX module
Load "glx"
# This loads the DRI module
# Load "dri"
EndSection
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if the line that says Load "glx", actually says #Load "glx" then it's "commented out", you just remove the # and save/quit - not sure if you have to restart X or not (you could just reboot of course) and then see what happens
You could, of course, have found that an onboard graphics device doesn't have enough "cojones" for the job!
Sorry if that doesn't help any, but I only had to battle with onboard sound, never onboard graphics.
regards
John