I followed McDonnelTech's great guide on how to install High Sierra on my X220T, and as it has for the past versions, it runs great for the most part. But as usual, my computer is giving me some strange undocumented issues that aren't addressed in the guide.
This time, it's the UI itself. The system will run fine for a while, or for several days even, and then suddenly the UI will freeze up. The mouse still moves and any audio in the background will keep on running, but I can't interact with anything on screen and things like HWMonitor's menubar will stop updating. The only solution I've found so far is to reset the computer, as it won't go to sleep when this happens.
I have a X220T with an i7 2620M, the custom BIOS to disable the hardware whitelist, a 120 GB SSD with TRIM enabled (I think I saw some posts about this being somehow related) and 4 GiB of RAM. I know such little RAM causes graphical glitches under macOS and I will soon upgrade because of that, but I'm not sure it's related given this wasn't an issue on 10.12.4. I'm not even sure how I would go on about finding the system logs for this given that I can't run any commands or start anything when it happens.
It might be worth mentioning again that this specific unit has quite a few odd issues that, trough my experience with it, have always been fixable trough software for some reason. The F5521gw card that's built into it will not show up under network like the thread mentions, but it shows up in the device list, and the audio kext from the guide gave me a lot of issues for some unexplained reason.
Any clues? Any help is greatly appreciated.
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