Nitto,
In my HP DV6604NR (AMD 64, NVidea) i have exactly the same trick.
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System freezes during boot, unless I hold a key down
https://bugs.launchpad.net/bugs/272247
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I have the same problem, but with the CTBC Telecom in Brazil.
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Virgin Australia Broadband 3G cannot connect in Intrepid Beta
https://bugs.launchpad.net/bugs/280490
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