We have found the golden one.

We found a bios for 4850 which allows to have dual-dvi on 4850 in leopard !

Dont worry, no need to flash anything, its all done soft way.

just try the updated aty-init – ATY_init zip

you will still need to use dvi2vga dongle if using only one dvi, but its easy to fix it by using patched motmot (from patched framebuffers in patched_files from irc)

good luck

also updated aty-init makes osx to think vga has 5.0 GT/s link speed, which is normal for pcie v2.0. (PCI cards in sys profiler)


  1. Jeff
    November 6th, 2009 | 6:08 am

    Sorry to post in such an old thread, but I am trying to get my new Gigabyte ATI 4850 [] working in my install of 10.5.8. I have 2 DVI monitors plugged in and I am getting the blue screens. Is there no fix for this at all? I am using the ATY_init.kext from here and the Natit.kext, ATIRadeon files from

    What am I doing wrong?

    ///dont use both aty_init and natit

  2. Jeff
    November 6th, 2009 | 6:10 am

    Also tried the Natit.kext, ATIRadeon files from

    Same result, blue screens.

  3. Bret
    November 10th, 2009 | 6:23 am

    I have Leo4all 4.1 installed. Everything seems to work great, but really low resolution. If I install ATY_Init, I get a blue screen with a arrow cursor. If I hit sleep or the power button, it goes into sleep, but just before it does, I see my desktop. If I hit the power button again, or the Enter key to bring it back, nothing comes back. I have installed other distributions, like iAtkos v7 and when I would do that, I would get it would come back up with the desktop, but then would crash with a kernal panic. I have a Sapphire HD 3870 512MB DDR4 PCIe. Is it a problem with this driver, or with a sleep mode? I have tried all the other drivers and this one has gotten me the closest. Any help would be appreciated. Been working on this for over a month with a bunch of different distributions.

  4. Antreas
    November 15th, 2009 | 3:00 am

    Any hope for HD4890 with dual dvi ports working???

  5. November 21st, 2009 | 12:13 pm

    Hello Netkas,

    Whatever i do, when i install the graphic drivers (i’ve tryd different combinations and distro’s). spaces has some corruption in the “middle” of the screen, but everything else is alright.

    It looks like a little wave in the form of a line.

    So i tried almost? everything, and maybe i doing something wrong.

    Netkas, you with your wonderful mind has probably a solution?

    Motherboard: Asus m3a78-t with 790GX and 750sb chipset
    Graphic card: Asus; HD4850 1GB link>
    Ram: 4 GB
    CPU: Amd phenom2 720-X3

  6. November 21st, 2009 | 12:15 pm

    BTW, this was in IDENEB 10.5.8 lite, and iaktos/ideneb 10.5.8.

  7. November 21st, 2009 | 12:18 pm

    i mean iaktos/ideneb 10.5.7.

    Hmpf, Saturday morning…

  8. marciuz
    February 22nd, 2010 | 1:28 pm

    Hello Netkas, thank you, with this kext I’ve finally solved an issue with NVIDIA GeForce4 MX 440SE with AGP8X

  9. neb
    March 24th, 2010 | 11:32 am

    Hi, i’ve got a PowerColor 4850 / 512m running fine with a vanilla 10.5.8 and i d’like to get dual screen working, can you give a new link to download this ATY_Init ? this one’s dead…

  10. Jeff
    May 2nd, 2010 | 7:09 am

    Link is broken

  11. umut
    May 26th, 2010 | 8:42 am

    link is dead please fix it 🙁

  12. CrazyJAT
    June 19th, 2010 | 8:05 pm

    Link dead. Can’t run Snow Leopard cause I get various issues with applications not opening and garbled display problems. So, if I need to stick with 10.5.8, it would be nice if I could get it working with my 4850.

  13. CrazyJAT
    June 21st, 2010 | 9:08 pm

    In addition to fixing the link…

    I have 10.5.8 and ATY_Init.kext installed. I am using Chameleon RC 4 with vanilla kernel. When I sleep my computer, everything goes off fine. When trying to wake from sleep, I get a garbled screen and have to reset. Any chance of fixing that? Using Natit, I can sleep and wake just fine, however I can’t do dual dvi. FYI, I have Graphics Enabler set to yes and I have tried Force Wake yes and no with no difference.

  14. Ajvan
    March 22nd, 2011 | 12:43 pm

    Download not available
    The following download is not available:

    Can you upload ATY_init zip to another hosting?
    I need ATY_init for HD4850 (10.5.8 Leopard).

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