Public bug reported:

Ubuntu 11.10 beta-1 desktop i386 and amd64. I can select language and other 
boot options when boot from cd, but when ubuntu is starting screen gets black 
and no more video output. After desktop is loaded i hear standart ubuntu sound 
(still no video output).
HW: Lenovo B560 with NVIDIA GeForce 310M(Optimus) CPU Intel i3-370M. tested 
with enabled and disabled optimus.

** Affects: ubuntu
     Importance: Undecided
         Status: New

** Description changed:

  Ubuntu 11.10 beta-1 desktop i386 and amd64. I can select language and other 
boot options when boot from cd, but when ubuntu is starting screen gets black 
and no more video output. After desktop is loaded i hear standart ubuntu sound 
(still no video output).
- HW: Lenovo B560 with NVIDIA GeForce 310M(Optimus) CPU (intel i3-370M). tested 
with enabled and disabled optimus.
+ HW: Lenovo B560 with NVIDIA GeForce 310M(Optimus) CPU Intel i3-370M. tested 
with enabled and disabled optimus.

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https://bugs.launchpad.net/bugs/851568

Title:
  no video output on Lenovo B560 (nv optimus enabled or disabled)

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