Intel Management Engine and NVIDIA Optimus power state mismatch. Fix: In Power Options > Advanced, set "Maximum processor state" to 99% (disables Intel Turbo Boost, which is often the culprit). Also, disable "Fast Startup" in Control Panel > Power Options > Choose what the power button does.
Installing these drivers randomly will cause conflicts. Follow this specific sequence: Dell Xps L702x Drivers For Windows 10 64 Bit
The Dell XPS L702x remains one of the most beloved premium laptops of the early 2010s. Known for its robust build quality, stunning 17-inch 3D display options, and powerful second-generation Intel Core processors, many of these machines are still in service today. However, if you have upgraded this veteran machine to Microsoft’s Windows 10 (64-bit), you may have encountered a landscape of missing drivers, unknown devices, and functionality quirks. Intel Management Engine and NVIDIA Optimus power state
Bluetooth drivers are often bundled with the Wi-Fi drivers. Installing these drivers randomly will cause conflicts
You may notice that your audio works, but the sound quality is low, or the subwoofer isn't working. The L702x uses Realtek HD Audio.