Question Laptop freezes when switching from dGPU to iGPU. (MUX SWITCH)

[Dejva1999]

Hello everyone,

I'm having a major issue with my laptop, and it's really frustrating. I have a laptop with a MUX switch and was counting on this feature to extend battery life during light tasks.

Here’s a video showing how the issue looks. It's from about a year ago on a slightly different Lenovo LOQ model I had before, but the problem persists on my new model as well (I foolishly thought it was only present on my older model).

View: https://www.youtube.com/watch?v=6o4zQfY7W6c

Specs:
CPU: Intel Core i5-13500H (Raptor Lake)
Display: 15.6" IPS, G-Sync, 2560 × 1440, 165Hz
RAM: 16GB DDR5
GPU: NVIDIA GeForce RTX 4060 8GB (115W, MUX switch)
Storage: 1TB SSD

Issue:
The problem occurs when switching from dGPU to iGPU after gaming. Every time I launch a game, the system correctly switches to the dGPU, and everything runs perfectly. However, once I exit the game, the system switches back to the iGPU, and then my screen starts freezing in 5-10 second intervals for about 2-3 seconds at a time. This issue persists until I restart the laptop. After a reboot, everything works fine on iGPU—until I start another game.

This happens in all power modes (Silent, Balanced, Performance) and whether the laptop is plugged in or running on battery.

Troubleshooting I've Tried (Without Success):
✔ Used DDU to completely uninstall both iGPU and dGPU drivers, then installed the latest ones
✔ Updated BIOS to the latest version
✔ Disabled various power-saving settings
✔ Tested different GPU modes (MUX switch enabled/disabled, hybrid mode, dGPU-only mode)

The only way to avoid the issue is to run on dGPU-only mode, but that significantly reduces battery life by about 2 hours.

Has anyone else experienced this? Any solutions that worked for you? I'd really appreciate any advice.

Thanks in advance!