On my Sony VGN-FS640/W I have three errors compiling my DSDT

  (http://www.zvolve.com/~garry/dsdt.dsl)

dsdt.dsl   506:             If (LEqual (And (PDC0, 0x0A), 0x0A))
Error    1022 -           Object does not exist ^  (PDC0)
dsdt.dsl   511:             If (LEqual (And (PDC1, 0x0A), 0x0A))
Error    1022 -           Object does not exist ^  (PDC1)
dsdt.dsl   553:                         If (LNot (LEqual (And (PDC1, 0x0A), 0x0A)))
Error    1022 -                             Object does not exist ^  (PDC1)

ASL Input:  dsdt.dsl - 4185 lines, 135677 bytes, 1667 keywords
Compilation complete. 3 Errors, 0 Warnings, 0 Remarks, 1 Optimizations

Does anyone know why this is the case or what to do about it?

-- 
Garry Williams -- +1 (678) 656-4579