Thanks eng_matt, I will try it your DSDT with dual link off, I think that is my problem, because my Screen resolution is 1366x768, and the DSDT then I'm using now don't have the APPL,DUALLINK patch.
My added Nvdia off DSDT , have a dual link patch for high display resolution screen ;
Because our display resolution Full HD:1920x1080
Dual Link Patch depending on your screen resolution, if it is over 1400x800 .
For this reason , I used to dual link patch.
I think that's the your issue.
Nvidia 540m + 1366x768 if your notebook have a this resolution. You don't need dual link patch. You can delete this patched extra code on DSDT.
here the good guide for this changes dsdt. Edit our added old Dsdt and use;
Can you try my added attachment dsdt. Maybe this fix your issue.
If your led is white again , I think something wrong your nvdia off dsdt. That's mean nvidia on again or 2 display card working together.
I will post the result when yet home.