If you stay to versions Yosemite and earlier you may have luck with post installation with the HP Prebook installer app. I have been unable to resolve the video card problem to get it working in Sierra. The USB 3.0 was enabled by the generic USB kext from Rehab Man (thanks), but I'm not sure Sierra is running USB 3.0 at true speed.

Hacking ATI x1300 into Mac OS X (Latest = Snow Leopard v10.6.8) [Update: 2012 March 29] A commenter has his 7146 X1300 running Lion via EvoEnabler and no other mods if you have a x1300 card that’s not cooperating with Lion, it would be interesting to try patching your bios to report a 7146 deviceid and see what happens see the related comments below for links to corresponding tools. Jan 26, 2016  I have a AMD Radeon HD 8250 GPU in my laptop. I've tried to look all over these forums and Google to try and find a kext for it. I was wondering if anyone can point me in the right direction on where to get a kext that works with my GPU.

I was able to get everything including the video card to work on Mavericks, by dumb luck. I think now I have a better understanding, what the Pro Book installer does: 1) installs patched kexts 2) modified the DSDT 3) modifies the 6000 controller kext 4) But only to Yosemite, that is an older OS and not desirable for my line of work I installed Sierra on a new HDD, mounted the EFI from the Mavericks install and copied the folders in the EFI to the new EFI partition on the Sierra HDD. I also copied the patched ATI6000 patched kext over to the Sierra permission, (installed with kext beast). And was not able to get anything going as far as the video card seeing the v ram and frame buffer issues. Are there specific kexts or clover settings or frame buffer differences from Sierra to Mavericks in the same video card? Or is this a lost cause? If you want more information how I was able to install on Mavericks, I can get you help.

Sierra has been no dice. Can anyone on the forum help us with this? I can send my EFI structure over whoever I can post it, as well the config.plist, as well the kext, provided this is not illegal. Thanks again.