Realtek
Realtek PCIe/USB Card Reader Controller
This is the host controller behind the memory-card slot on a large share of laptops and all-in-one desktops. It handles card detection, speed negotiation, and how the slot recovers from sleep, which is why the right driver matters even though the slot looks simple. On a branded machine, treat the Realtek name only as a clue; the version to install is the one your PC maker validated for that model, not a generic Realtek download, because the OEM build carries the power-management tuning the slot needs.
