No it's not 150% scaling. You can run native resolution just fine. With Linux it's actually better than higher resolutions, as the dot pitch is similar to a 27" 4k external monitor, so you can scale natively on both and have windows look approximately the same size. My other laptop is 4k, and it's a nightmare getting scaling to work because it has such a higher DPI than my external monitor. If Linux had better scaling support for HiDPI I'd prefer a 4k laptop but it doesn't, so native resolution is the way to go.