Problems with playing games on laptop with an underpowered AC adapter

My laptop charger recently broke and the only replacement I could find on short notice was a little crappy universal charger rated for only 75W, while my original charger was 135W. Most of the time this works fine but whenever I try to play any games, my GPU (nvidia GTX960M) turns on, and that results in it using more power than the charger can supply. The laptop then thinks the computer isn't charging anymore (because it's using more power than its getting) so the graphics card turns off and switches to integrated graphics to save power. Now that the GPU is off, the computer thinks its charging again because its not using as much power and the GPU turns on again. This gets caught in a continuous loop and I get stuck playing in 20-30 FPS instead of my normal 60+.I understand that normally the GPU throttles itself when on battery so it doesn't damage the batter by pulling more kWh than the battery can safely supply, but since I'm plugged in and receiving at least some power from the outlet, is there some way I can force my computer to keep my GPU on while charging?On a side note, I'm only assuming that its my GPU causing the problem because it's probably the most power-hungry component, but its also possible my CPU (quad-core i7) is disabling some cores to save power or something.Laptop Specs16GB RAMIntel Core i7-4720HQ 2.6GHzNvidia GTX960M 2GB VRAM500GB Hard Drive126GB SSD via /r/techsupport http://ift.tt/2sfOUg5