Mountain Lion 6XXX GPU Issues - FIX INSIDE!

Since many of you have issues getting your AMD Radeon HD 6000 series card to work in Mountain Lion (when it worked great in Lion), I decided to make this guide.

Credits: Haysphere

Part 1: Setting up the UniBeast Drive
1. Insert your UniBeast Flash Drive into a working Mac. Maybe your MacBook Pro, working Lion installation, etc.
2. Run this command in terminal to unhide files "defaults write com.apple.finder AppleShowAllFiles 1" (copy and paste that into terminal and hit enter)
3. Force Finder to quit. You can do this in activity monitor. It will automatically restart.
4. Open Finder and navigate to your UniBeast Drive
5. Navigate to System/Library/Extensions
6. MAKE A BACKUP OF the kext "ATI6000Controller.kext" and then DELETE it.

Part 2: Booting from your UniBeast Drive
1. Boot from your UniBeast drive like you usually would. Use the command "GraphicsEnabler=No" in order to boot into Mountain Lion Installer
2. Install Mountain Lion as you usually would
3. After installation, bootup Mountain Lion by booting into your flash drive and then booting into ML, using the command "GraphicsEnabler=No"
4. Copy the ATI6000Controller.kext kext to your new desktop
5. Run KextBeast (Download: http://www.tonymacx86.com/downloads.php?do=cat&id=3)
6. Reboot

Now your graphics should work. I have two monitors (Apple Cinema Display and another 25" 1080p monitor) running with full graphics acceleration Very fast and no lag!

For those wondering, I fixed my machine in my sig by replacing the parts with the exact same things. Not everything blew. I now run a surge protector on my phone line and computer.

You're welcome!

 

Giving this a shot now. Thanks for the consolidated info. Will report back.

 

I worked this out earlier and it aloud me to boot, but i only have one resolution. Does anyone know how to fix that?

 

Follow part 2. Restore the kext using KextBeast and then fix permissions. Reboot and you should be up and going.

After doing that, and rebooting, I had native resolutions on both my displays and full graphics acceleration support.

 

Perfect. Now onto MultiBeast. Thanks!

 

Thanks so much guys! I followed these instructions and am now writing this from my ML install with dual monitors working (and I think the screen looks sharper and better than in Lion)!

 

Works Like a Charm

Many thanks! Followed the post verbatim and it worked perfect ... now on 10.8!!

 

Worked for me as well, thanks very much. Only problem I have because I use the Display Port if the org.chameleon.Boot.plist changes back to defaults after reboot Monitor does not sync, I have to login to computer remotely to restore the org.chameleon.Boot.plist file.

 

Thanks!! that worked great for me.

Now i am up and running

 

thanks for info