Currently I don't have any driver available for the laptop that I use , and because of this I only can use Unity 2d and Gnome Panel.
I have Ubuntu 11.10 and Ubuntu 12.04 installed and no drivers for both.
I would like to use Unity 3d and Gnome Shell..instead of Unity and Gnome Panel or at least have that option even if computer became a little slower.
Is there a way of enabling Unity 3d and gnome without any driver had been installed?
(my video card is: 01:00.0 VGA compatible controller: Silicon Integrated Systems [SiS] 771/671 PCIE VGA Display Adapter (rev 10) )
You can't use anything without drivers. However, Linux has lots of drivers built in. Newer AMD Radeon cards doesn't require any extra drivers. Neither does Intel graphics. I'm not entirely sure what the situation is with Nvidia, though I think the newer ones should work well using built-in drivers.
Unity uses Compiz, which will always require hardware acceleration, meaning you do need good drivers, or at the very least, not horrible ones. Gnome Shell uses Mutter, which at least currently has similar requirements. But rumor has it, they're working on removing the necessity of hardware acceleration for Gnome Shell.
Since you have a SiS graphics chipset, you will only be able to use the more limited open-source drivers that come by default in a Ubuntu installation. With this chipset, recommendations on desktop-environments would be the more lightweight variant - for example, gnome-classic, unity-2d or xfce/lxde.