Can confirm on W520, W530, and W541 (I think). They all have terrible GPU support. The W530 for example has no video out muxer, so you have to use discrete graphics if you want any kind of external display, tanking your battery life. Brightness doesn't work.

Not only that, the W520, T420, and L420 [0][1] and W530 have BIOS/chipset bugs that mean you need to disable x2apic. Avoid unless you love tinkering with Linux.

[0] https://forums.lenovo.com/t5/ThinkPad-P-and-W-Series-Mobile/... [1] https://lkml.org/lkml/2012/12/18/1