Ubuntu 11.10 intel graphic card problem

I have installed Ubuntu 11.10 "Oneiric Ocelot" two days ago. I am using Ubuntu for two year in office and home. It works well and I have never got problem. But after installing new version I have got few problems. Unity starts with 2D whereas there was very good graphics in Natty. I think Oneiric did not install correct motherboard driver for graphics. I don't know how to fix this problem. One more thing that there is no option to change background and emblems in Nautilus file manager. Anyway, output of the command <lshw -C display> from my computer is as below:
 *-display:0
       description: VGA compatible controller
       product: 82Q35 Express Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 02
       width: 32 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:41 memory:d0200000-d027ffff ioport:1c70(size=8) memory:c0000000-cfffffff memory:d0000000-d00fffff
  *-display:1 UNCLAIMED
       description: Display controller
       product: 82Q35 Express Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2.1
       bus info: pci@0000:00:02.1
       version: 02
       width: 32 bits
       clock: 33MHz
       capabilities: pm bus_master cap_list
       configuration: latency=0
       resources: memory:d0280000-d02fffff
Kindly sort out my problem and give any solution if possible. I will be very grateful.