My x280:
Port 0: USB-PD 2.0 (USB-C 1.0) top panel left upper, data host, power sink
    Requires 5.0V*0.1A (0.5W), 5.0-20.0V (PPS), 5.0-20.0V (battery)
    Provides 5.0V*3.0A (15.0W)
Port 1: USB-PD 2.0 (USB-C 1.0) left panel center center, data host, power source
    Requires 5.0V*0.1A (0.5W), 5.0-20.0V (PPS), 5.0-20.0V (battery)
    Provides 5.0V*3.0A (15.0W)


Friend's x280:
Port 0: USB-PD 2.0 (USB-C 1.0) top panel left upper, data device, power sink
    Requires 5.0V*0.1A (0.5W), 5.0-20.0V (PPS), 5.0-20.0V (battery)
    Provides 5.0V*3.0A (15.0W)
Port 1: USB-PD 2.0 (USB-C 1.0) left panel center center, data device, power sink
    Requires 5.0V*0.1A (0.5W), 5.0-20.0V (PPS), 5.0-20.0V (battery)
    Provides 5.0V*3.0A (15.0W)
    USB-PD (unknown revision) partner
        Provides 5.0V*3.A (15.0W), 9.0V*3.0A (27.0W), 15.0V*3.0A (45.0W), 20.0V*2.25A (45.0W)