I have a laptop that supports USB-C Power Delivery, a ThinkPad T470. Charging it via a Lenovo USB-C power cable works fine, so USB-C PD works in general on this laptop.
I also have a monitor with USB-C PD on it, the 24MD4KL-B. The monitor should support up to 85W PD, and charging my phone via USB-C works fine. However, I cannot get my laptop to charge from it. I'm using the USB-C PD cable that came with the monitor. The monitor will work as a second display, so it's not a dead cable.
I have determined that the kernel thinks everything should be working:
$ cat /sys/class/typec/port0/usb_power_delivery_revision
2
$ cat /sys/class/typec/port0-partner/supports_usb_power_delivery
yes
What further steps can I take to debug why my laptop is not charging via USB-C Power Delivery from the monitor?
