jce69

Thanks for your turorial. I will try your guide one of these days on my dell 3521 and I will post results.  I have HD4000 & Ati 7670 i hope DSDT will work for me. 

Please let us know your results as I have the same laptop

Is my dell compatible? 

If so please assist me.

Operating System: Windows 8 64-bit
System Model: Inspiron 3521
BIOS: A08
Processor: Intel® Pentium® CPU 2117U @ 1.80GHz (2 CPUs), ~1.8GHz
Memory: 4096MB RAM
Card name: Intel® HD Graphics 4000

I know there's a similar thread, but my specs are a bit different.