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Is I2S audio supported on OSX?? Perhaps through a DSDT patch?? Didn't find any useful results on google. This laptops seems to be using I2S Audio interface as per this post on the HP Forum.

I am not sure how you calculated those commands. Looks like you have got all the commands wrong. The correct commands for your situation based on your IFR.txt would be as below.. setup_var 0x1F0 0x3 setup_var 0x1F1 0x3 Those commands are same for my Laptop also. If you are not even able to get...

Understood. Thanks for the explanation.. :thumbup:

Framebuffer patch didn't seem to be working on this Laptop.. At least for me as I might have done something wrong.. But the DVMT method works well..

That error is normal. Just proceed with changing both the values to 0x3 by running both the commands one by one and restart.. If you don't see 64MB as dedicated memory in Windows after rebooting, boot to UEFI she'll again and run the commands one more time..

Couldn't find a patched AppleHDA for this Codec... I will try to patch one myself..

Yes, like RehabMan said, make sure that the USB is created correctly and make sure the folder structure is correct. Let me know if you are still having difficulty.

I got it from Ubuntu. The audio was not working OOB in Ubuntu. I had to modify some grub settings to get it working. Details are here: http://h30434.www3.hp.com/t5/Notebook-PC-Sound-and-Audio/HP-spectre-x360-on-linux/m-p/5122160#M66839 Attached the Codec dumps from Ubuntu. I will work on...

The IFR.txt is used to just identify the location of DVMT Variable. You have to use UEFI Shell to modify the values. Follow "STEP 2.2: Using EFI Shell to change DVMT settings in BIOS." of this guide...

I have generated the SSDT and the Power management, Sleep & Wakeup are working fine now. I can see x86PlatformPlugin loaded in the IOReg. Couple of issues at the moment: 1. Taking approximately 20 seconds for going to sleep. 2. Touchscreen not working after Wakeup from Sleep and I see the...

I assume you are trying to change the DVMT Pre-allocated memory. The extracted BIOS files using AIDA64 Extreme tool from my laptop were unusable with UEFITools to extract the 'Setup --> PE32 image' section. So, I took an alternate route. Below are my steps which were successful for my model...

I am still struggling to get everything working on my Spectre x360, especially the Audio. I will try to put a guide together soon. Not finding enough time to work on this lately. Post exactly where you are struck along with screenshots if possible. I will try to help along the way.

How did you managed to find that you have ALC3242? I couldn't find my chipset model. Tried many tools including AIDA64 but no luck.

Attached.

Looks like Power management is working OOB. Am I right to say so by referring the attached Intel Power Gadget's Output? Is there anything else that should be done?? FYI, I have extracted my DSDT using AIDA64 in windows and generated SSDT using "Broadwell SSDT Generator". Placed both the files...

I am determined to get OSX working on this Slick Beast.. See my progress here: http://www.tonymacx86.com/yosemite-laptop-support/168847-hp-spectre-x360-yosemite-10-10-3-a.html

Spoke too early. Sleep works only for first time. After waking up, if I hit the Sleep one more time, it hangs with display turned off. Had to force reboot or it reboots automatically after 5 minutes approximately. Tried multiple times and same behavior. The Keyboard and trackpad are working fine...

Our hardware might have some differences I am afraid. Compare the specs I posted in OP. I will try to make one by some time next week. I have it working OOB. Didn't had to mod anything. However, internal Keyboard and Trackpad, doesn't work after wake until I reboot. The upgrade went smoothly...

Attached.

RehabMan, thanks for the guidance on Broadwell. I have updated the OP with the progress so far. Any suggestions on the processor name mismatch in 'About This Mac'?