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https://github.com/MSzturc/ThinkpadAssistant/releases

Indeed, I only inject RTS525a properties for cosmetic reasons so that the device gets listed in SysInfo->PCI. It's Firewall's kext that makes it work. RealtekCardReaderFriend is of no use to me as it does not make the RTS525a appear listed as an Apple Card reader. I would not worry too much about the "unassigned class" in Hackintool; I have the same yet the card reader is fully functional, it's just the tool that does not recognise the device type within macOS. Re: Fn keys, all the useful ones natively work (audio, keyboard light, sleep) except the screen brightness keys for which I inject an ACPI patch for Dell laptops. It's been documented several times on the forum. Of course, it applies to Dell machines, not Lenovo...

Hi; I've no experience with RTS5227 but I've had a couple of laptop, including my current Dell Latitude E7270, with the Realtek RTS525a model. All I use is Firewall's RealtekCardReader kext v0.9.7 (without its associated friend). The card reader is only ever functional after a 1st sleep. I suppose an ACPI patch would fix this but I never bothered to debug the wake process to identify what's done at ACPI level for the device compared to what's done (and not done) at 1st boot. I don't use it much so it's never really been a problem. I inject properties in my bootloader's config so my RTS525a card reader is listed in SysInfo->PCI section but, indeed, nothing in the SysInfo->Card Reader section. It's something I could not care less about. Still works perfectly in Sequoia (and Tahoe beta for that matter).

Try these kexts, I forked the repository and made them compatible with newer OS, the original versions are stuck in Ventura https://github.com/Baio1977/GenericCardReaderFriend https://github.com/Baio1977/RealtekCardReaderFriend It needs https://github.com/Baio1977/RealtekCardReader

Not an installation guide... Thread moved to the support section where it belongs.

Simply apply your patch under the condition of booting/running Mac OS X/OS X/macOS, i.e.: If (_OSI ("Darwin")) { // your patch here } or If (_OSI ("Darwin")) { // your patch here } Else { // original ACPI code }