Thanks for your help
So i tried to follow your guide for HD4000. But even if i change the dev id to the one that is shown in the system report window, "Applegraphicspowermanagement" will not show up if i execute kextstat.
Also if i try to generate the hex from the device-properties.plist gfxutil returns this error:
"invalid property list xml inputfile 'device-properties.plist'!"
I used the device-properties from the source thread and also copypasted the one in your thread.
Any idea?
Thanks in advance