Resolving the DP4 HDMI hang

People with a HDMI (only) display plugged-in at boot time, may run into a system hang with OS X 10.9 DP4 on Haswell systems. We here resolved this with a workaround – modified the PlatformInformation for one of the frame buffers:

03 00 22 0D 00 03 03 03 00 00 00 02 00 00 00 01
00 00 00 00 00 00 00 40 99 14 00 00 99 14 00 00
00 00 00 00 00 00 00 00 03 06 10 00 01 00 00 00
00 00 00 00 01 05 12 00 04 00 00 00 00 00 00 00
02 04 14 00 00 08 00 00 00 00 00 00 FF 00 01 00
01 00 00 00 40 00 00 00 02 00 00 00 01 01 00 00
04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00

Apple is probably going to fix the HDMI problems in OS X 10.9 DP5 or with a Graphics Update for DP4 but until then this workaround can be used. Just give it a try and let us know if it works for your setup/motherboard as well. Thanks!

Did you notice what we did with the FB Index? Indeed. We removed the delays and changed the FB Index order to: 3, 1 and 2. This gives us port-number: 7, 5 and 6.

Adding a delay on the last framebuffer (used for HDMI here) changes the port-number from 6 to 0, but that isn’t causing us any problem. At least not here with our setups.

Update-1:

We now have a small bash script (AIFBAzul.sh) to patch platformInfo in AppleIntelFramebufferAzul.kext It is very easy to use and not only enables you to patch/replace platformInfo, but also to undo/restore a patch. All you need for this is to run AIFBAzul.sh with the same AAPL,ig-platform-id (see example below).

1.) Download AIFBAzul.
2.) Rename the file to AIFBAzul.sh (required due to a WordPress limitation).
3.) Change the data of: AAPL,ig-platform-id: 0x0d220003
4.) Open a terminal window and run: sudo ./AIFBAzul.sh 0x0d220003 replace
or: ./AIFBAzul.sh 0x0d220003 patch
5.) reboot

You can run: sudo ./AIFBAzul.sh 0x0d220003 restore
or: sudo ./AIFBAzul.sh 0x0d220003 undo
to restore/undo a patch.

You can run: sudo ./AIFBAzul.sh 0x0d220003 show
to get the platformInfo data:

AAPL,ig-platform-id: 0x0d220003 located @ 317368
————————————————
004d7b8: 0300 220d 0003 0303 0000 0002 0000 0001 ..”………….
004d7c8: 0000 0000 0000 0040 9914 0000 9914 0000 …….@……..
004d7d8: 0000 0000 0000 0000 0105 1200 0004 0000 …………….
004d7e8: 8700 0000 0204 1400 0004 0000 8700 0000 …………….
004d7f8: 0306 1000 0004 0000 1100 0000 ff00 0100 …………….
004d808: 0100 0000 4000 0000 0200 0000 0101 0000 ….@………..
004d818: 0400 0000 0000 0000 0000 0000 0000 0000 …………….
004d828: 0000 0000 0000 0000 ……..

Tip: Booting in single-user mode enables you to restore the platformInfo. For example, when a patch isn’t working for you.

The fun part is that people can now share patched platformInfo data, and all other people will have to do is to replace PATCHED_PLATFORM_INFO (in function initPatchedPlatformInfo) and run AIFBAzul.sh to patch their copy of AppleIntelFramebufferAzul.kext

Update-2:

We changed the script a little and now AIFBAzul v1.2 won’t call otool anymore. Please give v1.2 a try and let us know what you think of it. Feedback is welcome here 😉

14 thoughts on “Resolving the DP4 HDMI hang”

Welcome back – reposted this on IM with full credit to source.

pikeralpha | August 4, 2013 at 5:38 pm

Thank you Tony. And thanks for reposting this.

Reply

Hello Pikeralpha

Where ist this “Platforminformation” ? is in a kext ? or where ?
i will change this in blue color Numbers self, so that HDMI work in DP4.

Thank you for detailed Help

Pinarek | August 4, 2013 at 10:56 pm

i have found this AppleIntelFramebufferAzul.kext in S/L/E.
Can i here change this Numbers ?

Reply
- pikeralpha | August 5, 2013 at 2:12 am
  
  Yes. You can use a hex editor to make the required changes in AppleIntelFramebufferAzul
  or wait for me to add/release a simple bash script to change the framebuffer (available soon).
- Pinarek | August 5, 2013 at 11:55 am
  
  Trank you Friends….. Will Wartung for you Script.
  Send you me this per Mail to me ?

Where do I find these values to edit?
My Graphic card is a Geforce GT620 and its framebuffer no such
key.
only in AppleIntelFramebufferAzul.kext
Anyone know how to change the ports for HDMI NVidia Geforce cards?

pikeralpha | August 5, 2013 at 2:15 am

Sorry. This workaround is for the AppleIntelFramebufferAzul.kext only and I have no idea what to change to get for your Geforce GT620 going.

Reply

Hi pikeralpha,
Do you have idea how to fix HD6850’s framebuffer for HDMI in DP4?

pikeralpha | August 6, 2013 at 8:55 am

No. Sorry. Just wait for DP5 (soon available).

Reply

Hi again, I’m willing to try the script but is there a boot flag that can get me past the hang? So I don’t have to get my whole PC out and unplug the HDMI? Maybe I can make it not use the DSDT or will -s work? Also will I have to change my ID to 0x0d220003 ? I don’t use a GPU just the integrated 4600 with HDMI. Thanks 🙂

pikeralpha | August 6, 2013 at 3:04 pm

Yes. You want -s (single-user mode) since that allows you to undo/restore.

Reply

Hi Piker, can you helpme to get audio in a ga-z87x-ud5h (Haswell) for 10.8.4. I tried almost everything with AppleHDA. I read every week your blog, Your are awsome!!!

pikeralpha | August 10, 2013 at 9:56 am

No. Sorry, but I only use OS X 10.9 Mavericks these days. I have to, otherwise it would take too much time.

Reply

Tony Dickinson (@tonydickinson) | August 4, 2013 at 10:40 am

Welcome back – reposted this on IM with full credit to source.

- pikeralpha | August 4, 2013 at 5:38 pm
  
  Thank you Tony. And thanks for reposting this.
  
Pinarek | August 4, 2013 at 10:45 pm

Hello Pikeralpha

Where ist this “Platforminformation” ? is in a kext ? or where ?
i will change this in blue color Numbers self, so that HDMI work in DP4.

Thank you for detailed Help

- Pinarek | August 4, 2013 at 10:56 pm
  
  i have found this AppleIntelFramebufferAzul.kext in S/L/E.
  Can i here change this Numbers ?
  
  - pikeralpha | August 5, 2013 at 2:12 am
    
    Yes. You can use a hex editor to make the required changes in AppleIntelFramebufferAzul
    or wait for me to add/release a simple bash script to change the framebuffer (available soon).
  - Pinarek | August 5, 2013 at 11:55 am
    
    Trank you Friends….. Will Wartung for you Script.
    Send you me this per Mail to me ?
Mirone | August 4, 2013 at 11:01 pm

Where do I find these values to edit?
My Graphic card is a Geforce GT620 and its framebuffer no such
key.
only in AppleIntelFramebufferAzul.kext
Anyone know how to change the ports for HDMI NVidia Geforce cards?

- pikeralpha | August 5, 2013 at 2:15 am
  
  Sorry. This workaround is for the AppleIntelFramebufferAzul.kext only and I have no idea what to change to get for your Geforce GT620 going.
  
shiecldk | August 5, 2013 at 6:08 am

Hi pikeralpha,
Do you have idea how to fix HD6850’s framebuffer for HDMI in DP4?

- pikeralpha | August 6, 2013 at 8:55 am
  
  No. Sorry. Just wait for DP5 (soon available).
  
Andrew | August 6, 2013 at 11:47 am

Hi again, I’m willing to try the script but is there a boot flag that can get me past the hang? So I don’t have to get my whole PC out and unplug the HDMI? Maybe I can make it not use the DSDT or will -s work? Also will I have to change my ID to 0x0d220003 ? I don’t use a GPU just the integrated 4600 with HDMI. Thanks 🙂

- pikeralpha | August 6, 2013 at 3:04 pm
  
  Yes. You want -s (single-user mode) since that allows you to undo/restore.
  
Budafilms | August 9, 2013 at 5:47 pm

Hi Piker, can you helpme to get audio in a ga-z87x-ud5h (Haswell) for 10.8.4. I tried almost everything with AppleHDA. I read every week your blog, Your are awsome!!!

- pikeralpha | August 10, 2013 at 9:56 am
  
  No. Sorry, but I only use OS X 10.9 Mavericks these days. I have to, otherwise it would take too much time.