"0251 cmos checksum bad" after wakeup from hibernation

[nikolayperin]

Have "0251 cmos checksum bad" message after wakeup on hibernatemode 25. On hibernatemode 3 don't have this message.

[nikolayperin]

Possible solution: HibernationFixup + RTCMemoryFixup + boot-args: rtcfx_exclude=80-AB + ReservedMemory dict in config.plist

• https://github.com/simprecicchiani/ThinkPad-T460s-macOS-OpenCore/issues/103
• https://github.com/tylernguyen/x1c6-hackintosh/issues/44#issuecomment-697270496

[5T33Z0]

Thanks for the info. I've implemented your suggested solution. test the updated EFI: https://github.com/5T33Z0/Thinkpad-T490-Hackintosh-OpenCore/releases/tag/OC_102.2

Let me know if it works.

[nikolayperin]

Reboot after ware up, and check disk errors

[5T33Z0]

I guess then you have to stick to hibernatemode 3 or try to resolve the issues yourself, since I don't have the time to investigate this.