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NVMeFix is a set of patches for the Apple NVMe storage driver, IONVMeFamily.Its goal is to improve compatibility with non-Apple SSDs. It may be used both on Apple and non-Applecomputers.

The following features are implemented:

  • Autonomous Power State Transition to reduce idle power consumption of the controller.
  • Host-driver active power state management.
  • Workaround for timeout panics on certain controllers (VMware, Samsung PM981).

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Other incompatibilities with third-party SSDs may be addressed provided enough information issubmitted to our bugtracker.

Unfortunately, some issues cannot be fixed purely by a kernel-side driver. For example, MacBookPro11,1 EFI includes an old version of NVMHCI DXE driver that causes a hang when resuming fromhibernaton with full disk encryption on.

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NVMeFix requires at least Lilu 1.4.1 and at least 10.14 system version. It may be compatible witholder systems, but has not been tested.

It may be installed to /Library/Extensions on 10.15 and earlier, or injected by the bootloader on all versions.


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-nvmefdbg enables detailed logging for DEBUG build.

-nvmefoff disables the kext.

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-nvmefaspm forces ASPM L1 on all the devices. This argument is recommended exclusively for testing purposes,as for daily usage one could inject pci-aspm-default device property with <02 00 00 00> value into the SSD devices and bridge devices they are connected to onboard.Updated values will be visible as pci-aspm-custom in the affected devices.

Some SSDs misbehave when APST is on. NVMeFix attempts to detect broken motherboard and SSDcombinations and work around them. Motherboard is detected via IORegistry keys injected by Clover,or NVRAM variables provided by OpenCore.

APST table entries specify minimum idle latency for the transition to occur. Maximum acceptablelatency is 100000 microseconds, and may be overriden via little-endian 8-byte propertyps-max-latency-us of parent PCI device (e.g.IOService:/AppleACPIPlatformExpert/[email protected]/AppleACPIPCI/[email protected],5/IOPP/[email protected]). If set to 0, APSTwill be disabled completely.

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RELEASE build will only log high-level information about failures.

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DEBUG build will additionally log used power states, detailed error messages, and attempt tofetch APST status and table from the controller.

APST enable status is posted to the IONVMeController IORegistry entry apst key.


If active power management initialisation is successful, an NVMePMProxy entry will be createdin the IOPower IORegistry plane with IOPowerManagement dictionary.

Information about power states supported by the controller may be obtained e.g. using smartmontools.For example, in the following output the controller reports 5 states, where the former threehigh-power states will be used by NVMeFix for active power management, and the latter two may beused for APST depending on ps-max-latency-us.

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IONVMeFamily supports the following debug flag bitfield, which are passed either via nvme bootargor debug.NVMe sysctl:

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IONVMeFamily supports the following additional bootargs: