Using the XPS 7590 with i7 9750H and GTX 1650 GPU. For the most part it's alright and thankfully runs Linux very well (most of my work is primarily Linux based so that is a must in a laptop). The recently uncovered issue I found is when playing games there seems to be a latency issue that I cannot identify. Part of me is wanting to try on Windows and see if the issue persists but gaming is more of a hobby and this appears a little like an issue I found in my old ASUS laptop.

There is a slight input lag when gaming but the OS appears fine. The issue is not found on either of my desktops but appears similar to the one I had on my old ASUS k501ux with its hybrid graphics. Anyone notice a slight input lag when running in "ondemand" mode and launching an app with Nvidia GPU?

It almost seems like the issue is due to the Nvidia GPU copying its framebuffer over the Intel iGPU which might incur a latency penalty. That is likely the issue with my now scrapped ASUS laptop and they appear to have the same slight delay. The frame rates are unplayably low on Intel iGPU (predictably) so I could not test if the iGPU has lower latency but maybe there is a way to perhaps fix or mitigate the issue by using the HDMI or the USB C port for video... maybe there is an issue with Nvidia drivers that could reduce the issue that I am not aware of.

Is anyone on Windows using this for gaming on the side and seeing the same issue (playable frame rate, slight latency)? Does anyone have any ideas for me to try?

Also does this laptop have a MUX chip to multiplex the Nvidia GPU and Intel GPU? I hear MUXless laptops have more of this kind of issue than ones with a MUX chip.

While I will install Windows to fix the issue switching to Windows is not an option since I do lots of serverside code and having similar Linux on server and work machine makes my life easier since I can run most of my tests locally and only have to do one final test on the server. That and dual-booting is not ideal since I have limited SSD space. I can use Windows to troubleshoot and flash Linux back afterwards but I cannot permanently switch this machine over (that is what I saved my old desktop for).