After few minutes using, desktop and fonts in unity-menu goes blurry. See screenshot.!

In all applications (browser etc.) graphics seem to be allright. After rebooting problem disappears for few minutes. Changing the wallpaper also makes the desktop clear (for a while) but fonts are still blurry.

I have ubuntu 12.04 and windows xp dualbooted.

lspci:

00:00.0 Host bridge: Intel Corporation 82945G/GZ/P/PL Memory Controller Hub (rev 02)
00:02.0 VGA compatible controller: Intel Corporation 82945G/GZ Integrated Graphics Controller (rev 02)
00:02.1 Display controller: Intel Corporation 82945G/GZ Integrated Graphics Controller (rev 02)

lshw -c video:

  *-display:0             
   description: VGA compatible controller
   product: 82945G/GZ Integrated Graphics Controller
   vendor: Intel Corporation
   physical id: 2
   bus info: pci@0000:00:02.0
   version: 02
   width: 32 bits
   clock: 33MHz
   capabilities: vga_controller bus_master cap_list rom
   configuration: driver=i915 latency=0
   resources: irq:16 memory:d0100000-d017ffff ioport:30c0(size=8) memory:c0000000-cfffffff memory:d0180000-d01bffff


*-display:1 UNCLAIMED
       description: Display controller
       product: 82945G/GZ 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: cap_list
   configuration: latency=0
   resources: memory:40000000-4007ffff

Have you got any ideas to get this solved? Thank you very much!

Bonfire