VGA Option ROM (optional): you need it if you want graphics in several bootloaders, and proprietary OS.digitizer + touchscreen on x230t variant.mini DisplayPort + fullsize DisplayPort (X230T).dock (UltraBase Series 3 for X220 works, too).Windows (through GRUB-as-payload loading SeaBIOS image from disk you have to use extracted VGA blob, dumped from memory isn't good enough).Sound (integrated speakers, integrated mic, external headphones, external mic).Expresscard slot (including hotplugging).
eGPU (works on Linux with 16GB of RAM - not on Windows, see above). It will only detect it as a PS/2 mouse otherwise. UltraNav driver for the TrackPoint needs to be force-installed via device manager on Windows 10. eGPU will not work on Windows 10 (ACPI BIOS ERROR bluescreen) - tested with a PE4C and NVidia GT730 attached via ExpressCard. Buttons for screen rotation (X230T) and microphone mute don't work on Windows 10 (the first issue also causes the "Tablet Service" tsmservice.exe to hog one cpu core. Automatic screen rotation will not work on Windows 10 (X230T). Badly seated RAM may prevent booting (not really a problem but coreboot is more suspicious to this than vendor BIOS). Thanks for your interest in Lenovo X230 port. Intel_Native_Raminit has it's own status page. 
6 Setting battery threshold on a X230 with coreboot.
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