[Tsiklon]

To my recollection on the machines that shipped with Lion (circa 2011) you’ll want to set up a protective MBR with the appropriate drive dimensions on the GPT, to get it to install windows like with boot camp.

To my recollection on machines with discrete GPUs this is what triggers the appropriate hardware configuration (BIOS boot, disabling the internal GPU and switching the MUX to only route via the AMD card)

But I do recall getting the internal GPU working with this trick https://github.com/0xbb/apple_set_os.efi

[pidgeon_lover]

Thank you very much for that! That might explain why one of the macbooks I installed Windows on seemed to have laggy screensavers, whereas the others (Air) seemed to work just fine.

I installed the MacOS Lion installer from a memory stick to the internal SSD (partition 1), Mac OS Lion itself to partition 2 (minimal size) and Win7 to partition 3 via Bootcamp, and it works well, aside from laggy screensavers on one of them, and losing around 10GB to the Mac Lion installer partition 1 (I don't know if there's a way to force it to install MacOS to 1x partition, rather than 2x, while fully offline)