10.10.3 Update Black screen with cursor

[jaxparo]

Great! You solution seems to work. How did you discover this?

I'm on a real Mac that unsupported for Yosemite, Mac Pro 1,2 w/Radeon HD 7750. When I edit the info.plist it kills the Apple kext signing, and won't load, so I was forced to disable kext signing using the Terminal command "sudo nvram boot-args=kext-dev-mode=1" and rebooting.

When the AMDRadeonX4000.kext is not loaded, a normal boot resulted in scrambled glitchy screens. A Safe Boot was usable but glitchy with lines & refreshes. OpenGL was non-functional, giving test rates of 4-7 fps. After enabling AMDRadeonX4000.kext test rates were about 500 fps for the same. Great catch, but I wish I knew how you found this? Also, is there a way to edit the info.plist without ruining the Apple signature?

Hi, I've managed to get it worked.
The problem is in the new AMDRadeonX4000.kext.
The new values in 10.10.3 for "cail_properties" of AMDVerdeGraphicsAccelerator driver are:
<dict>
<key>CAIL_DisableDrmdmaPowerGating</key>
<integer>0</integer>
<key>CAIL_DisableDynamicGfxMGPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableGfxCGPowerGating</key>
<integer>0</integer>
<key>CAIL_DisableGmcPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableStaticGfxMGPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableUVDPowerGating</key>
<integer>0</integer>
<key>CAIL_DisableVCEPowerGating</key>
<integer>0</integer>
</dict>
The old values (in 10.10.2) was:

<dict>
<key>CAIL_DisableDrmdmaPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableDynamicGfxMGPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableGfxCGPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableGmcPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableStaticGfxMGPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableUVDPowerGating</key>
<integer>0</integer>
<key>CAIL_DisableVCEPowerGating</key>
<integer>1</integer>
</dict>
Once I change it back in Info.plist and clear kext cache, my system boots without problems.

 

[jaxparo]

I was forced to disable kext signing using the Terminal command "sudo nvram boot-args=kext-dev-mode=1" and rebooting.

It appears disabling kext signing may have been rash. There is 'local code signing' which would enable the modified info.plist kext only for my computer. I think the correct Terminal command is "sudo codesign -fs - /System/Library/Extensions/AMDRadeonX4000.kext" which should have enabled the modified kext to load without disabling the security for all kext signing. I haven't tried this.

 

[polyzargone]

Hi, I've managed to get it worked.
The problem is in the new AMDRadeonX4000.kext.
The new values in 10.10.3 for "cail_properties" of AMDVerdeGraphicsAccelerator driver are:
<dict>
<key>CAIL_DisableDrmdmaPowerGating</key>
<integer>0</integer>
<key>CAIL_DisableDynamicGfxMGPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableGfxCGPowerGating</key>
<integer>0</integer>
<key>CAIL_DisableGmcPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableStaticGfxMGPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableUVDPowerGating</key>
<integer>0</integer>
<key>CAIL_DisableVCEPowerGating</key>
<integer>0</integer>
</dict>
The old values (in 10.10.2) was:

<dict>
<key>CAIL_DisableDrmdmaPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableDynamicGfxMGPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableGfxCGPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableGmcPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableStaticGfxMGPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableUVDPowerGating</key>
<integer>0</integer>
<key>CAIL_DisableVCEPowerGating</key>
<integer>1</integer>
</dict>
Once I change it back in Info.plist and clear kext cache, my system boots without problems.

Thanks a lot ! It just save me from re-installing my whole system

 

[olegt]

Great! You solution seems to work. How did you discover this?

Actually I didn't discover it myself. I found the solution at one Russian forum, so I don't know why it works and how it has been discovered . I can't give the link because once I put a link in a message the message doesn't appear (I've tried a couple of times).

 

[Altauria]

olegt, THANK YOU!! This worked perfectly. I wonder if this should be added to the main 10.10.3 release thread. I was going to mention it, but didn't want to step on anyone's toes; being that you did much of the work, really. I believe many people are having issues with this update using their AMD 7xxx cards.

 

[raulduke13]

olegt, THANK YOU!! This worked perfectly. I wonder if this should be added to the main 10.10.3 release thread. I was going to mention it, but didn't want to step on anyone's toes; being that you did much of the work, really. I believe many people are having issues with this update using their AMD 7xxx cards.

I want to say thanks too... IT WORKED! .. my card did not have a black screen it looked more like 4 bit graphics. i was having to do the sleep trick via ssh (sudo pmset sleepnow) or hot keys alt,cmd,f12 to get it working... so glad a plist edit fixed it
I also linked this thread to the 10.10.3 update thread.

 

[log7]

For olegt

Excellent, Bravo

 

[padishah]

Thanks a lot man, it's working now

 

[171621]

Can anyone help post the modified amdradeonx4000.kext on this thread? I couldn't get access into Yosemite after upgrading, nor could I boot into safe mode, I can't edit the file within Yosemite and repair permission and clear cache.... Please help, thank you so much~~~~

 

[lazag]

Hi, I've managed to get it worked.
The problem is in the new AMDRadeonX4000.kext.
The new values in 10.10.3 for "cail_properties" of AMDVerdeGraphicsAccelerator driver are:
<dict>
<key>CAIL_DisableDrmdmaPowerGating</key>
<integer>0</integer>
<key>CAIL_DisableDynamicGfxMGPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableGfxCGPowerGating</key>
<integer>0</integer>
<key>CAIL_DisableGmcPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableStaticGfxMGPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableUVDPowerGating</key>
<integer>0</integer>
<key>CAIL_DisableVCEPowerGating</key>
<integer>0</integer>
</dict>
The old values (in 10.10.2) was:

<dict>
<key>CAIL_DisableDrmdmaPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableDynamicGfxMGPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableGfxCGPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableGmcPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableStaticGfxMGPowerGating</key>
<integer>1</integer>
<key>CAIL_DisableUVDPowerGating</key>
<integer>0</integer>
<key>CAIL_DisableVCEPowerGating</key>
<integer>1</integer>
</dict>
Once I change it back in Info.plist and clear kext cache, my system boots without problems.

Hello,

Thank you very much.

I can now boot, but... a flew minutes after (seems when i do something as open finder or safari), my screen become with stripes in 2 colors (not each time the same 2 colors) and i see nothing, i can do nothing, cmd-alt-f12 without effect
Please, someone have already see something like that ? A lead ?