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When I install Ubuntu 11.10 on my VirtualBox (running on Windows 7) and update the packages, it recognizes the display as the VirtualBox display, and gives me the options of various resolutions, one of them being right for my display, all works well.

But then, when i install it on my machine (like was Windows 7) it doesn't give me the resolution options, even with the system updated and the openchrome graphics driver installed (which was also when running on Virtualbox).

What could be the reason for this happening? (Could the VB guest software influence on this?)

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closed as too localized by Eric Carvalho, Thomas W., psusi, Mateo, Basharat Sialvi Apr 18 '13 at 5:02

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Remember that virtual box uses virtual hardware drivers for the guest os. that means your guest OS cannot use real hardware directly(most of) but after you install it without Vbox, it recognizes them and install drivers. but in your case, i think your monitor isn't detected very well by ubuntu. refer this askubuntu.com/questions/74808/… –  Prasad RD Apr 16 '12 at 1:37
As Prasad said, when using VirtualBox you are actually indirectly using Windows 7's video adapter device driver rather than working directly with the adapter. So if Windows supports your adapter then so will Ubuntu in VirtualBox. What video adapter does your system use? –  irrational John Apr 17 '12 at 18:10
via chrome 9 hc igp on VN896 chipset –  user55111 Apr 18 '12 at 19:08