Here is another set of DSDTs for the D520. There seems to be a question on the use of the AAPL01,DualLink variable.

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This set of DSDTs set the value to 1. This makes both the internal display and an external display unusable. I'm not sure what to do now. I'm on my netbook typing this because my D520 is now useless. Using the DSDT=NO option gives me no display at all, and using the attached DSDT gives me junk internal/external output. I do have the original EDP DSDT (that at least gives me internal display) backed up in /Extra Backup, so I'm gonna boot off the install partition and use Terminal to delete this DSDT and replace it with EDP's and see how that goes. Wish me luck.