What OS X are you using? I am on 10.9.4
Herve,
How can I provide you with that, if I am already using a patched DSDT? And How do I provide the IOReg? I'll gladly send you any items you need.
What's even more interesting, is that I have a mackintosh build based on an ASUS ROG Gene V that has been working flawlessly since 10.8. I just went and tried my logitech c510 usb camera and it also has the black screen on any app that uses it (that computer is now on 10.9.4). It was working perfectly in 10.9.2!
Now, I am wondering if something happened with the 10.9.4 update. It's odd I have the identical issues on two completely different hackintoshes.