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[SOLVED] Gigabyte 6850 shows only 5MB of VRAM, v-e-r-y s-l-o-w

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So this was working perfectly under Lion, but ML is a different story.

 

I finally got ML installed by taking the card out and using the onboard graphics. I reinstalled the card, but it would hang just before login using graphicsenabler=yes. So i set it to graphicsenabler=no. (i'm using duckweed, and 4 ports). This got me into mountain lion, but the display is the wrong resolution, and is very very very slow. I mean, when I pull up launchpad, it takes about 1 complete minute to draw the background and each icon. And it shows I only have 5MB of VRAM on the card???

 

Any suggestions?

 

 

3sQiC.png

 

For reference, I'm running a Q9550 on a GA-EG45M-UD2H.

 

 

 

EDIT: Solution was to reinstall fresh ML, but taking care to remove ATI6000Controller.kext from /system/library/extensions of the USB installer stick. Later, we install that kext using kext wizard to the completed ML install partition. See later post for details.

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I have the exact same problem, tried a few things but still the same. Anyone running Sapphire 6850 on ML final at native resolution?

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Okay, I got 6850 working in ML.

 

I downloaded this: http://www.osx86.net/downloads.php?do=file&id=2916 and installed using KextDrop (you can use your choice of kext installer).

 

This is my boot.plist:

 

 

<key>PCIRootUID</key>
<string>1</string>
<key>GraphicsEnabler</key>
<string>Yes</string>
<key>AtiConfig</key>
<string>Gibba</string>
<key>AtiPorts</key>
<string>4</string>

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Success! I finally got it to work. What worked:

 

Before installing ML, On the ML installer USB stick you make, completely delete the ATI6000Controller.kext from /system/library/extensions/

(make sure to make a backup of it, as we will need it later)

Then install Mountain Lion as normal. The resolution is wrong, and SLOW, but it installed.

After install, and you can boot into ML, use kext wizard to install ATI6000Controller.kext backup made earlier.

 

I'm using these options:

 

 

<key>AtiConfig</key>

<string>Duckweed</string>

<key>AtiPorts</key>

<string>4</string>

<key>GraphicsEnabler</key>

<string>Yes</string>

 

System identifies properly as AMD Radeon HD 6850 and is working perfectly with no artifacts!

 

Something is wrong with the installer when ATI6000Controller.kext is present and it messes up the ATI kexts. Once removed, the install works great.

 

I am happy now! But now time to work on AppleHDA.kext.... my sound is not working. :\

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Random question, why would you need ATIPorts=4?

 

Wondering if it has anything to do with a build I setup with a 5850, and it won't output to 3 monitors at once like it does in Windows.

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