Yosemite HP v014la

[acmzero]

It is common. It is likely related to HDMI-audio (lack of or partial implementation)...

HMDI audio for Haswell has the following requirements:
- Device at 0x00030000 renamed to HDAU (it usually B0D3)
- patches to framebuffer to change DP ports to HDMI ports (there are patches in my example config.plist files but disabled)
- "hda-gfx"="onboard-1" property injected on HDAU/HDEF/IGPU objects
- FakePCIID_Intel_HDMI_Audio.kext if your HDAU device is not supported (0x0a0c is supported, 0x0c0c is not natively supported)

(eventually, I'll write a guide...)

how can i know which patch to apply (to the framebuffer)?

also i made the other changes (except the Fake PCIID) and it doesn't throw a KP but both screens remains black.

 

[RehabMan]

how can i know which patch to apply (to the framebuffer)?

Depends on which connector is used for HDMI. Try both, each set one at a time.

also i made the other changes (except the Fake PCIID) and it doesn't throw a KP but both screens remains black.

You'll need to experiment. Which ig-platform-id are you using. FakePCIID is required if your HDAU device is not a recognized device-id.

 

[acmzero]

I am using 0x0a260006 and got device id 0a0c from ioreg so i suppose that i don't need FakePCIID?

is it a requirement to have AppleHDA working before this for it to work?

 

[RehabMan]

I am using 0x0a260006 and got device id 0a0c from ioreg so i suppose that i don't need FakePCIID?

Correct.

is it a requirement to have AppleHDA working before this for it to work?

Yes... or I should say, I've never tried without...