you may have to ask Yen to help look into it. I could provide another custom mod, but it would risk bricking your laptop.
hey iMatrix i did it myself! actually i found a different bios on the maufacture's ftp site and i investigated it. that already had SLP 2.0 into it. so i modded it with the bios mod tool. and it works perfectly! interesting to note that SLIC info was saved on to HOLE01.rom i shall post the bios here so that it could be useful for someone. thanks for your effort imatrix.
just remember, custom settings changes from time to time depends on type of bios, in this case I ticked "Replace existing SLIC Elements" and "Only replace OEM/Table IDs from RSDT/XSDT in the rweverything report"