The logic seems simple enough: extend AppleGraphicsDeviceControl and implement a couple of methods which return some vendor specific information. I'm not sure if this is needed or not, but in High Sierra, there is this new IOResource called AppleGPUWrangler that acts like IODisplayWrangler (which handles display plugging/unplugging and stuff) but for GPUs. In this case, I copy-pasted the personality from NVDAStartupWeb.kext and added the IOPCITunnelCompatible key locally but pointed the CFBundleIdentifier to NVIDIA's bundle. Instead, I use a little known feature of IOKit which is exporting a personality implemented in another kext. But that breaks the signature and also won't survive updates so it seems like too hacky of a solution to me. The old way of doing this is to modify the ist of the relevant driver. I suspect this logic was used to fix some AMD specific race condition with eGPU attachment that is not applicable to NVIDIA drivers (the setup order is different).
Logic drivers for mac os sierra driver#
Once I plug the USB into my Arduino board, it causes a kernel panic on my Mac, how do I remove the driver Thanks. It is not immediately obvious if this causes any problems, and more research is needed here. Hello, I have upgraded to macOS Sierra, the notorious CH341SERMAC2 driver stopped working. Both extend from IOFramebuffer and therefore needs to have the attach() method patched. NVDA is used to attach a driver to each nub. IONDRVFramebuffer is used to set up a IOKit nub for each display port. The "fix" here is to bypass this check and we need to do it in two places. However, NVIDIA's drivers wait for the framebuffer to be set up first before setting up the controller, so there is a resource wait deadlock. The idea here is that the framebuffer should wait for the graphics controller to be set up first. If (descendant-> metaCast( "AppleGraphicsDeviceControl ")) While ((descendant = OSDynamicCast(IORegistryEntry, descendantIter-> getNextObject()))) Pci, gIOServicePlane, kIORegistryIterateRecursively) OSIterator *descendantIter = IORegistryIterator::iterateOver(
While (( NULL = OSDynamicCast(IOPCIDevice, pci)) & KIORegistryIterateRecursively | kIORegistryIterateParents)) Bool IOFramebuffer::attach(IOService *provider)īool tunnelled = ( NULL != provider-> getProperty( kIOPCITunnelledKey, gIOServicePlane,
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