Clandestine USB SD card slot

[George Mitchell]

FreeBSD 10.3-RELEASE-p7 #0: Thu Aug 11 18:38:15 UTC 2016
Acer Aspire E15
There is a slot on the front of this laptop which sure looks like an
SD card slot, which I hope corresponds to one of these:

ugen1.1: <EHCI root HUB AMD> at usbus1, cfg=0 md=HOST spd=HIGH (480Mbps)
pwr=SAVE (0mA)
ugen0.1: <XHCI root HUB 0x1022> at usbus0, cfg=0 md=HOST spd=SUPER
(5.0Gbps) pwr=SAVE (0mA)
ugen2.1: <EHCI root HUB AMD> at usbus2, cfg=0 md=HOST spd=HIGH (480Mbps)
pwr=SAVE (0mA)
ugen1.2: <product 0x7900 vendor 0x0438> at usbus1, cfg=0 md=HOST
spd=HIGH (480Mbps) pwr=SAVE (100mA)
ugen2.2: <product 0x7900 vendor 0x0438> at usbus2, cfg=0 md=HOST
spd=HIGH (480Mbps) pwr=SAVE (100mA)
ugen0.2: <product 0x10b8 vendor 0x1058> at usbus0, cfg=0 md=HOST
spd=SUPER (5.0Gbps) pwr=ON (224mA)
ugen1.3: <Generic USB Hub ALCOR> at usbus1, cfg=0 md=HOST spd=FULL
(12Mbps) pwr=SAVE (100mA)
ugen2.3: <product 0x2970 vendor 0x06cb> at usbus2, cfg=0 md=HOST
spd=FULL (12Mbps) pwr=ON (100mA)
ugen1.4: <USB OPTICAL MOUSE vendor 0x0101> at usbus1, cfg=0 md=HOST
spd=LOW (1.5Mbps) pwr=ON (100mA)
ugen1.5: <USB 2.0 Hub vendor 0x1a40> at usbus1, cfg=0 md=HOST spd=FULL
(12Mbps) pwr=SAVE (100mA)
ugen1.6: <E-MU XMidi1X1 Tab E-MU Systems,Inc.> at usbus1, cfg=0 md=HOST
spd=FULL (12Mbps) pwr=ON (100mA)
ugen1.7: <product 0x300b vendor 0x04ca> at usbus1, cfg=0 md=HOST
spd=FULL (12Mbps) pwr=ON (100mA)
ugen1.8: <HD WebCam NC.21411.02W44504122LM0007> at usbus1, cfg=0 md=HOST
spd=HIGH (480Mbps) pwr=ON (500mA)

But inserting a card into the slot produces no results, even with
sysctl hw.usb.umass.debug=1 hw.usb.ugen.debug=1 hw.usb.dev.debug=1.
(sysctl hw.usb.debug=1 produces way too much output all the time.)
Any suggestions on how I can get this slot to overcome its shyness?
(I am not subscribed to the list; please CC me.)          -- George