Well, I didn't find the fix myself - I stumbled on it. The slot stopped working at some point, and I shipped the laptop 4 times back to Dell, and they replaced every link on the hardware chain - slot itself, port interface card, connecting cable, and the main board - to no avail. I was mighty frustrated, as you can imagine.
Today I was removing the Control Point software from Dell, as this thing tended to spin out of control and eat up all CPU cycles lately. I have no use for it anyway. During the uninstall process, a driver message popped up: "Ricoh SD Reader installed" (may not be the exact wording) - that's my long lost SD slot! WTF? It felt as if the Control Point somehow suppressed the driver/device, and with its removal, the long ignored function came back. In any case, thank goodness for it!
During the painful troubleshooting with Dell, out of more than 5 technicians/support engineers, not one even mentioned anything related to the Control Point. Go figure...
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