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I know it's been a long time since these original posts, but I had the same problem. Install kexts and all USB went away. The trick was this line from the original linked solution. Configuration of the USB controllers is often dependent on BIOS settings. For most PCs, you should use XHCI "auto"...

Thanks for posting this. Since the latest patch/Multibeast apply I can't keep my machine running for more than a few minutes at a time with my card reader attached.

I've got the same problem with a GA-Z87X-OC Force. It uses the ALC898. First boot usually has no sound, reboot usually has sound, but only usually. 7.3 had the same problem. I think it might be more related to 10.10.4. I didn't notice the problem until then.

I hang during boot if I install the 10.3 TRIM support. I didn't go verbose to see the specific error, but the progress bar goes for a while and stops with a question mark icon. I reinstalled and tried to enable TRIM twice just to make sure it was the TRIM. Edit: Never mind, missed the dev kext...

I had to install the latest Chimera to get my Yosemite installer drive to boot. That fixed the mac_kernel error.