Hi all, I have a serious problem with a friend laptop, which is an 850m 4GB HP Envy 15 (which has optimus obviusly - i7 4510u - 8GB). Since HP tech.support cannot help me further, i thought to write here. Basically what happens, not all the times but most of them, its that the GPU gets stuck to lowest clocks possible and it doesnt go up to 3D clocks, no matter what i try. So what i did to try to "fix" the problem is: - Reinstall from zero Windows 10 - Roll back drivers from windows - Using Windows Update Drivers - Using drivers from HP Support Assistant - Using DDU, perform a clean in safe mode, reinstall drivers - Update to latest drivers using GeForce Experience - Use ThrottleStop to keep CPU up to exclude thermal throttling - Manually set "prefer maximum performance" and force every possible game to run manually on the Discrete Gpu - Set manually clocks of 2d and 3d states to stock clock speed - Disable the dGPU, reboot, reenable it in windows and try again Windows 10 is completely up to date, as well all other drivers in it (intel gpu as well). So to partially fix this (and it doesnt work all the times) i need to unistall the drivers, reinstall them and reboot. Sometimes, let's say 7 on 10, it works. GPU starts working again. But most of the times, it doesn't. So i'm at loss here; the laptop supports win10 officially as the drivers pack have been uploaded to the laptop page, so that shouldn't be an issue. This is a screenshot of both CPUZ and GPUZ: http://imgur.com/a/Sdr9Y I'm clueless, WHEN IT WORKS, i can get the most out of it, it still holds up pretty fairly and i can game for the whole day. Disabling or hybernating the laptop doesn't help, neither an hard reset or cold boot. Thank you all, i'm open to any suggestion. PS: yes i tried to google and fixes etc are for win7 or 8, most of them are pretty dated. Also most of them advise what i've already tried. If anyone had an experience like this, let me know. I heard that a particular driver works fine for this kind of chipset but i got no source for that.