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The LG 27 inch Class Ultra HD IPS 4K 27UD88-W Monitor advertises that it is capable of charging devices that have USB type C ports while simultaneously performing as a secondary display.

HP's new Chromebook 13 G1 has two USB-C ports that support USB Power Delivery, USB 3.1 Gen 1, and DisplayPort 1.2 connections.

Using software from Granite River Labs to capture the USB Power Delivery Protocol transaction, we can look at the communication between the LG 27 inch Class Ultra HD IPS 4K 27UD88-W Monitor and the HP Chromebook 13 G1.

Initially the Power Delivery source (the monitor) only provided a single PDO of 7.5 watts (5 volts @ 1.5 amps), which the Power Delivery sink (the Chromebook) then requested.

A few moments later, however, they did the negotiation again and this time the monitor advertised that it could support 10 watts (5 volts @ 2 amps), 36 watts (12 volts @ 3 amps), and 57 watts (19 volts @ 3 amps) power profiles.

This time, the HP Chromebook 13 G1 requested 45 watts (19 volts @ 2.36 amps) from the LG 27 inch Class Ultra HD IPS 4K 27UD88-W Monitor.

We took the above screenshot while the Chromebook was at 76% battery. Here we can see that the HP Chromebook 13 G1 is pulling 18.9 volts @ 2.2 amps from the LG 27 inch Class Ultra HD IPS 4K 27UD88-W Monitor.