Hi, 

I was quite frustrated when my Alienware 17 R2 (2015, Intel HD Graphic 4600, NVidia GTX 980M) auto goes dimming everytime. When I browsed the bright webpage or apps, the brightness goes 100%; however, when I work on dark webpage or apps like Steam, it auto dims to 25% or 0%. I tried all of these methods but they seem don't work for me: 

1. Adaptive Brightness in Power Management: Turn off 

2. Control Panel --> Services --> Disabled Intel Dynamic Application Loader Host

3. Intel HD Graphic Control Panel --> Disabled Extended Battery & Display Power Saving Technology

4. Drivers of NVidia already updated. 

5. Laptop is always plugged in, no concern about power source. 

Anything else I can do for this? Please help since it's quite annoying and I've got some headache with that. 

Thanks so much in advance.