There are many ways to rip the DSDT out of the laptop BIOS.
If there is a BIOS editor it is possible to rip out the .AML file.
However below is an easy way to obtain the DSDT AML file.
First download and install a powerful system BIOS viewing utility called RW-Everything.
Next launch the program.
Click the "ACPI" picture menu button just below the menu bar.
It will say building DSDT and you have to wait for a while.
Once it is ready, Click on the DSDT Tab and press Save as Binary (The Picture of the Floppy Disk with a "bin" word on it or Shift + F2)
Name it as DSDT.AML
This will be the AML file you will decompile to readable text by a ASL Compiler.
If you want me to check it you can upload it on a file sharing site (please upload it on a easy to download site like mediafire etc no rapidshare please) I will check the DSDT syntax.