It is so sad that for us not in the Apple Ecosystem it is impossible to find a desktop HiDPI display. We are stuck in 4k for the past 5 years. This Dell is the only "option", but I don't know how many of us can afford spending $5k on a monitor with a lifetime of ~ 3 years that has not shown great reliability.
Meanwhile, Linux has made the lives of 4k display owners unlivable due to the lack of non-integer scaling. A 5k display with 200% scaling at 27" would help the situation, but we don't have that option.
Many times I have considered jumping on to the MacOS boat, just for the high dpi display availability & scaling support advantage.
There are some very hacky ways that involve special add-on cards for the motherboard, special motherboard model requirements, gpu connector requirements and even special software to adjust the brightness.
It is doable, but it is expensive, and it may or may not work properly. One example that I remember is one where some users who attempted the above setup reported that they need to unplug & re-plug the monitor after it sleeps.
LG does not support non apple software/hardware for that monitor. You can hack your PC with TB cards and special motherboards that support these cards to show signal, sometimes. This is far away from "works fine".
Meanwhile, Linux has made the lives of 4k display owners unlivable due to the lack of non-integer scaling. A 5k display with 200% scaling at 27" would help the situation, but we don't have that option.
Many times I have considered jumping on to the MacOS boat, just for the high dpi display availability & scaling support advantage.