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HD5750 Framebuffer Sierra (or, what I wish people had told me about patching framebuffers in clover)

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Putting this here for posterity in hopes it helps someone else (maybe just my future self).


I just spent 2.5 days getting my previously working HD5750 up and running after a motherboard swap.  At the same time, I upgraded to Sierra.


Here's what I wish people had told me about patching your framebuffer in Clover:


  • Patches only take effect with "WithKexts" in boot args.  At least, that was the case for me.
  • Patches don't get recognized if they cross line breaks (yes, even in a binary file there are line breaks).  Thus, attempting to patch a multi-line framebuffer fails in a single patch.  I believe this is why the official "ATIConnector" patch sometimes fails.

If someone had spelled out those things for me, I would have been done in a few hours, not a few days.


That said, here's my working configuration:


Card details:

Asus HD5750, 1GB vRAM, Mfr ID:  0x1002 (ATI), Device ID:  0x68BE  Subsystem ID (useful for matching BIOS):  0x03381043
Card on TechPowerUp:  https://www.techpowerup.com/vgabios/79262/asus-hd5750-1024-100331


Working Framebuffer (note the extra 2 bytes at the end of each line compared to most examples ... I believe this is a Sierra quirk):


10 00 00 00 10 00 00 00 00 01 00 00 00 00 00 00 02 12 04 03 00 00 00 00
00 08 00 00 04 02 00 00 00 71 00 00 00 00 00 00 22 05 01 01 00 00 00 00
00 04 00 00 04 06 00 00 00 71 00 00 00 00 00 00 21 03 02 02 00 00 00 00
02 00 00 00 00 01 00 00 00 71 00 00 00 00 00 00 11 02 02 04 00 00 00 00


To get it working in Clover v2.3 r3766 (Use Clover Configurator to make your life easier):


  • Spoof Device ID as 0x100268B8 ("Fake ID" in "Devices")
  • Check Inject ATI (in "Graphics")
  • FB Name "Alouatta" (in "Graphics")
  • Video Port "4" (in "Graphics")  (Setting ports to 4 with the Alouatta personality will initially recognize both the HDMI and DVI outputs, but they will detect with the monitors swapped)
  • Custom Boot Flag:  "WithKexts" (in "Boot")


Three separate patches in "Kernel and Kext Patches", one for each output:


  • Name:  AMD5000Controller, Find:  00040000 04060000 00710000 00000000 11020101 00000000, Replace:  00080000 04020000 00710000 00000000 22050101 00000000, Comment:  HDMI
  • Name:  AMD5000Controller, Find:  00040000 04060000 00710000 00000000 22050404 00000000, Replace:  04000000 14000000 00710000 00000000 11020204 00000000, Comment:  DVI
  • Name:  AMD5000Controller, Find:  02000000 00010000 19010000 00000000 12040303 00000000, Replace:  10000000 10000000 00010000 00000000 02120403 00000000, Comment:  VGA (not tested)




Useful resources:


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In case you've never been told: don't put your hands in boiling water... Don't put your fingers in a live power socket either. Don't put your cat in the washing machine or the microwave.

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Framebuffer            Hoolock


ATI Connectors  Data         Find 





ATI Connectors Patch all in one          Replace



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