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I have a Dell Inspiron n4030 with an Intel HD graphic card but it's detected as "unknown" graphics card and it's not working well when I use it with an external monitor Samsung Syncmaster 933sn

I have tried Ubuntu 10.10, 11.04 with the same result

Any help would be appreciated

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This is your problem.

Go there and mark it for resolution, so they include the fix in the official distribution

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