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When I connect my Acer 21.5" LCD monitor to my Lenovo X220 using a DisplayPort to VGA connector, the monitor shows up under 'Displays' but when I enable the monitor, it doesn'twork and I get the following message in /var/log/syslog:

 [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting

If I connect the monitor using a VGA cable and the VGA port, it works as expected. This laptop has the Intel i5 and HD 3000 graphics chipset. Running 12.04, 3.8.0-35-generic x86_64

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