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Notebook External Monitor

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http://askubuntu.com – first of all I want to say I'm new to Ubuntu. I have a HP dm4 1075br, running Ubuntu 11.10 64 bits and I'm having problems when trying to use an external monitor. The system detects it, but the monitor outputs "no signal". I've already installed the additional driver "ATI/AMD proprietary FGRLX graphics driver". This is what output when typing "lspci" on terminal: 00:00.0 Host bridge: Intel Corporation Core Processor DRAM Controller (rev 02) 00:01.0 PCI bridge: Intel Corporation Core Processor PCI Express x16 Root Port (rev 02) 00:02.0 VGA compatible controller: Intel Corporation C (HowTos)