[YLUG] Dual xorg.conf

[Matthew Burton]

Hey people,

I'd just like to say thanks for the install day, since then I've been 
using Ubuntu also exclusively and only switch back to windows to get 
data from it! I've had a play around with it quite a bit (I'm Linux noob 
on the whole) and I've got a things working quite well thanks to google 
and the community wiki.

I have quite a strange laptop though, I have two graphics cards. They're 
controlled by a switch on the laptop which instructs the BIOS as to 
which one to use. So if I want more power (heat, noise and battery drain 
lol) I can flip onto my 6600. At the moment I've got my xorg.conf 
looking like this:

    Section "Device"
        Identifier    "Intel Corporation Mobile 915GM/GMS/910GML Express
    Graphics Controller"
        Driver        "i810"
        Option        "XAANoOffscreenPixmaps"
        VideoRam    131072
        Option        "DRI"        "true"
        BusID        "PCI:0:2:0"
    EndSection

    Section "Device"
        Identifier    "NVIDIA Corporation NV43 [GeForce Go 6600]"
        Driver        "nvidia"
        BusID        "PCI:3:0:0"
        Option        "NoLogo"
        Option        "RenderAccel"        "true"
        Option        "AllowGLXWithComposite" "true"
    EndSection

    Section "Monitor"
        Identifier    "Generic Monitor"
        Option        "DPMS"
        HorizSync    28-84
        VertRefresh    43-60
    EndSection

    Section "Screen"
        Identifier    "Default Screen"
        Device        "Intel Corporation Mobile 915GM/GMS/910GML Express
    Graphics Controller"
    #    Device        "NVIDIA Corporation NV43 [GeForce Go 6600]"
        Monitor        "Generic Monitor"
        DefaultDepth    24
        SubSection "Display"
            Depth        24
            Modes        "1680x1050"
        EndSubSection
    EndSection


At the moment I have to edit xorg.conf every time I want to switch card 
by changing the comment bit! And have to remember the one I last used 
otherwise I get nothing on screen at all (since the other card is 
disabled by the BIOS)!

So my question, is there a way I can make a script or something that 
asks me which card I'm using before X starts and changes my xorg.conf 
automatically?

Sorry for bombarding you but another quick question! Whats the 
difference between Beryl and Compiz, are they worth it, and do they work 
with Dapper Drake at the moment? I tried both quickly but had no success.

Anyway thanks for getting me into the world of linux guys, much appreciated!