![]() ![]() Users might notice this effect at work when switching between applications and media when in battery mode. PCWorld reached out to Intel for comment, and received this statement: “Intel Display Power Saving Technology (DPST) reduces power consumption on mobile PCs by reducing backlight of the laptop panel while maintaining quality on screen. While your mileage may vary by laptop and use case, it’s safe to say that Intel’s power efficiency software doesn’t meaningfully improve battery life. Increasing the Power Efficiency level is supposed to reduce image quality, thereby increasing battery life, but in my case the opposite was true. In that test, the laptop ran for 11 hours and 9 minutes at Intel’s default Power Efficiency level 4, but lasted a whopping 12 hours and 46 minutes with Power Efficiency level 1. This video captured my desktop screen as it flipped between light and dark backgrounds every 10 seconds. I also created a video of my own to simulate the kind of contrast fluctuations that had bothered me so much to begin with. With the Power Efficiency set to level 1, the laptop lasted 10 hours and 53 minutes. With Intel’s Power Efficiency setting at its default level 4, the laptop lasted 10 hours and 36 minutes. My first test involved looping the open-source 4K video Tears of Steel-the same video we use in PCWorld’s battery rundown test-at maximum brightness with no sound on my Lenovo Yoga C940. In fact, my testing showed that dialing down Intel’s power efficiency settings led to an increase in battery life. Will changing these settings drain your laptop’s battery? Not at all.
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