Create a dsdt-modified.aml DSDT file with a 36-bit root bridge This three step solution removes Window's 32-bit PCIe allocation constraint in order to resolve the eGPU error 12: Rather, the definitive solution is below. Decreasing TOLUD by reducing RAM to 2GB offers a somewhat impractical workaround. An eGPU requires a relatively large PCIe config space to allocate into. This can indicate there is insufficient 32-bit addressing space available to host the eGPU.
#Build a dsdt in windows for os x free
When retrofitting a eGPU, an error 12 (This device cannot find enough free resources that it can use) can occur against an eGPU in Windows' device manager making it inoperable. Neither of those OS require a DSDT override and can allocate freely in the huge 64-bit PCIe address space. macOS ignores the root bridge constraints as too does Linux when booted with the 'pci=noCRS' parameter. Windows OS honors the root bridge definition and will allocate PCIe devices within it. A watermark TOLUD value is then set and locked in the system firmware. Here ◄ pre-compiled DSDT overrides - load or use as reference when making your ownĪ Windows system's DSDT table root bridge definition (ACPI PNP0A08 or PNP0A03) is usually confined to a reserved 32-bit space (under 4GB) budgetted to be large enough to host the notebook's PCIe devices. Here ◄ Mac owners please work through this thread to solve error 12 before doing a DSDT override
DSDT override eGPU error 12 fix (Windows only)
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