Placing 'omapdss.debug=1' on the kernel cmdline provides lots of useful
messages which can be used to debug the issue further.

It seems the values the monitor provides via its EDID are non-standard,
thus confusing the DSS HDMI driver.

The monitor is providing the following values:
    1920 1080 setting with 138.5 MHz

-- 
LG monitor behaving incorrectly when used in conjunction with the Panda board 
and HDMI
https://bugs.launchpad.net/bugs/605832
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