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I have a thinkpad t420 with nvida optimus nvs 4200m, which i originally bought for university. When i try to play tf2 (or any other video games while plugged in), the game becomes laggy (major fps dropping), but once i unplug the power, the game runs very smooth.

Has anyone who plays tf2 had this sort of experience before, and knows a way to fix it? Ive tried just having discrete graphics on its own on the bios settings, but still the same lag. Dont really want to constantly play tf2 on the battery as it would run the battery health down alot.

specs: i7 2620m @2.7ghz w/turbo boost, 4gb 133mhz ddr3 ram. Enough to normally play tf2 smoothly

Quoted from xerxes

Thats simply LOL!

Have you tried to run the pc with power cable and without the battery?

yup still the same problem :(

Checked the adv. power settings ? It would be unusual but maybe your system throttles the cpu down when plugged in (should usually be the other way around).

Quoted from Shifty

Checked the adv. power settings ? It would be unusual but maybe your system throttles the cpu down when plugged in (should usually be the other way around).

i did a fresh install of windows so it would be unlikely, but ill check. also just tried a bit of trackmania without the battery installed and performance is worse, so may be the cable :S

ive been trying in high performance mode, checked the advanced setting. Ive uninstalled the lenovo power manager which i forgot i installed and am going to restart now to see what happens