i just opened the dash, and closed it again. the closing took forever,
and the launcher and top bar didn't come back.

a terminal running top, showed compiz racing to 100% cpu and staying
there.

here's the thing: when switching to vt2 and back to vt7, unity was
suddenly fine, and i saw compiz sinking down to about 10% cpu

is there any info or log file i can submit?

my system:
ACER Aspire 9300
1.7 Gb RAM
CPU: AMD Athlon(tm) 64 X2 Dual-Core Processor TK-53 × 2 
graphics: GeForce Go 6100/integrated/SSE2  (running NVIDIA experimental binary)
OS: ubuntu 12.10 64-bit

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https://bugs.launchpad.net/bugs/1064834

Title:
  Compiz spends 94% of its CPU time in glTexImage2D() from
  nux::IOpenGLSurface::InitializeLevel() from ...
  nux::GraphicsEngine::CreateTextureFromBackBuffer when the dash is open

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