The damn NVidia "optimus" laptops without hardware mux.
My laptop (2017 Gigabyte Aero 14W) has an nvidia GTX 1060 that I never use (the i7's internal GPU is perfectly adequate to run IDEA IntelliJ, YouTube's videos, and GNOME's desktop animation at QHD 2560x1440p. PLENTY ADEQUATE). So I never, ever waste 25+W running the damn nvidia chip, except for ONE thing: enabling the external outputs.
Yep, if I want to display something on a beamer, I must run "intel-virtual-output -f" in a clunky shell away.
Older laptops/chips at least had the good grace of having a real HDMI multiplexer on the external outputs, now it must be blitted through the nvidia chip.
Fuck you, NVidia. Fuck you again.
(and yes, Gigabyte, you failed. If you sold the same machine without the nvidia chip, even at the exact same price, I'd have bought it without hesitation. But yours was the only 14" option with a real (really quad-core) i7 and ability to have 32 GiB of RAM, under 2kg, this winter).