Mux Switch

[domozurek]

Hello, I have been using omarchy for a month, it is my first linux distro (before that I just used Ubuntu in virtual machine sometimes). Today I remembered that on Windows I could set which GPU (Intel integrated or NVIDIA dedicated) manages the laptop display (with NVIDIA Control panel). After some digging I found out that now my laptop's display runs on integrated gpu. I know about envycontrol, nvidia-prime and supergfxctl, but these tools only manage which gpu renders/computes stuff. It is always passed to iGPU. In my UEFI/BIOS, there is no option to select dGPU, only "Switchable graphics", which I always used and "UMA Graphics". Is there someone here willing to help me? Also, I have Lenovo laptop, so I probably cannot use the asusctl tool, which is needed to switch to MUX with supergfxctl.

[siayu18]

I'm also digging around to find answers for this and I manage to control between dGPU and iGPU, just with supergfxctl (I have asusctl too). Sadly I don't have a mux switch to test it out, but from the supergfxctl docs it seems like you can edit the conf file to use the mux switch?

This is the easiest method imo, else I think you're left with tinkering nvidia-prime by referring to the arch wiki.

[domozurek]

I looked into it. It seems that the supergfxctl is made for older optimus technology, which required a restart. My laptop has NVIDIA Optimus Advanced, which works on OS level and should not need a restart to switch (as it functioned on Windows). So supergfxctl is a dead end if you have Optimus Advanced imo.

One approach that should work but heavily relies on laptop model documentation/reverse engineering is ACPI calls. If you know which acpi call switches the MUX, in theory, you should be able to switch it. For my laptop, there is no acpi docs that I found (and I don't think in other cases it will be better).

For now I just accepted that it cannot be done easily and I will use hybrid mode with prime-run as the dgpu display is best used in games and I don't play that much these days as I used to. However if you or anybody found out new information about this, let me know, please.