The SD slot does not see cards - driver or hardware?

If Device Manager shows a warning icon or an unknown device - a driver. If the reader looks healthy and the card is still invisible, test the card in another device first.

Which driver does a laptop SD slot use?

Most often Realtek Card Reader, sometimes Alcor or Genesys. The Hardware ID tells you exactly; the package from your laptop model's support line is the safest pick.

Does a USB smart card reader need a driver?

Usually yes: install the Realtek USB Smart Card Reader package or the reader maker's driver, then the software that works with the card.

Card readers drivers

Card reader drivers serve the SD slots in laptops and smart card readers. Nearly all of them are built on Realtek, Alcor Micro or Genesys chips - and after a Windows reinstall the slot often stays dead until the package goes in. The drivers here are from official sources.

DriverManufacturerVersionReleasedWindows / Arch

GL9755 SD Host ControllerSHA-256 verifiedGenesys Logic1.1.57.370May 8, 2026Windows 1164-bit
GL9755 SD Host ControllerSHA-256 verifiedGenesys Logic1.1.57.320April 10, 2026Windows 1164-bit
GL9750 SD Host ControllerSHA-256 verifiedGenesys Logic1.1.56.0December 30, 2025Windows 1164-bit
GL9767 PCIe SD UHS-II & SD Express Card Reader ControllerSHA-256 verifiedGenesys Logic1.2.31.0December 29, 2025Windows 1164-bit
Virtio 1.0 memSHA-256 verifiedRed Hat, Inc.100.102.104.29400December 8, 2025Windows 11Windows 1064-bit
GL9755 SD Host ControllerSHA-256 verifiedGenesys Logic1.1.55.0November 24, 2025Windows 1164-bit
GL9755 SD Host ControllerSHA-256 verifiedGenesys Logic1.1.54.0October 8, 2025Windows 1064-bit
RTS5129 Card Reader ControllerSHA-256 verifiedRealtek10.0.26200.31290September 2, 2025Windows 1164-bit
GL9750 SD Host ControllerSHA-256 verifiedGenesys Logic1.1.53.100July 29, 2025Windows 1164-bit
GL9767 PCIe SD UHS-II & SD Express Card Reader ControllerSHA-256 verifiedGenesys Logic1.2.27.530July 10, 2025Windows 1164-bit

Card readers drivers by brand

Common problems with these devices

SD card not detected

About card readers drivers

The symptom is always the same: a card goes in, nothing happens, Explorer shows nothing. Device Manager meanwhile has either an unknown device or a reader with a warning icon. The Realtek Card Reader package (the most widespread) or the driver from your laptop model's support line brings the slot back.

Smart card readers - the ones for digital signatures and bank cards - are their own subspecies with their own packages: typically the Realtek USB Smart Card Reader driver or the reader maker's own.

Frequently asked questions

The SD slot does not see cards - driver or hardware?: If Device Manager shows a warning icon or an unknown device - a driver. If the reader looks healthy and the card is still invisible, test the card in another device first.
Which driver does a laptop SD slot use?: Most often Realtek Card Reader, sometimes Alcor or Genesys. The Hardware ID tells you exactly; the package from your laptop model's support line is the safest pick.
Does a USB smart card reader need a driver?: Usually yes: install the Realtek USB Smart Card Reader package or the reader maker's driver, then the software that works with the card.