“Can you disable the discrete GPU to save battery life in bios and use Intel iris graphic?”
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The Q528 uses Intel Iris by default. The NVIDIA GPU is used (automatically) only if you're gaming - if the Iris is at 100%, or even disabled, the NVIDIA will not be used unless you're gaming (which I found strange). The Intel or the Iris GPU can be disabled/enabled from Device Manager, no need to reboot. I'm not a gamer, but use multiple (4K) displays with lots of video streaming - I found the Intel Iris working great
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