[Solved]
The sound system here is pretty complicated. There is only one card, but it has 2 outputs.
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cat /proc/asound/cards
0 [PCH ]: HDA-Intel - HDA Intel PCH
HDA Intel PCH at 0x90810000 irq 101
29 [ThinkPadEC ]: ThinkPad EC - ThinkPad Console Audio Control
ThinkPad Console Audio Control at EC reg 0x30, fw N15HT35W
But to look at the inputs, you can use:
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aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC3239 Analog [ALC3239 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
Setting things graphically is equally confusing. I'm using Mate, but other desktops should be similar.
I assumed that looking at the inputs would show what I need to change. Instead you have to look at the hardware tab and select the profile, but only after the HDMI cable is plugged in. If you look before the cable is plugged in it doesn't show.
I'll include screenshots once I figure out how to do that.