AMD R9 270 doesn't work properly after 10.10.3 update

[Jithin.C.V]

I must thanks you Jithin.C.Vfor the two files, now my R9 270 is working, Dual display is working also, ( it was not working in 10.10.2)

AMD Radeon HD 7xxx:


Chipset Model: AMD Radeon HD 7xxx
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 2048 MB
Vendor: ATI (0x1002)
Device ID: 0x6811
Revision ID: 0x0000

thank you very much

Good to hear.. Enjoy your Yosemite..

 

[dotpix]

I used your files with a R7 250 but all I got is a black screen.
If I try to edit the Info.plist with the new values the pc gives me "AMDRadeonX4000...is malformed".
Can you make them compatible with my graphic card please?
Thanks

 

[Jithin.C.V]

I used your files with a R7 250 but all I got is a black screen.
If I try to edit the Info.plist with the new values the pc gives me "AMDRadeonX4000...is malformed".
Can you make them compatible with my graphic card please?
Thanks

What is the device id?

 

[dotpix]

In the System Information it's reported as 683f. But i think the right one is 6610.

 

[Jithin.C.V]

In the System Information it's reported as 683f. But i think the right one is 6610.

Boot in safe mode. Goto Applications > Utilities > System Information > Graphics/Displays.

Post a screen shot.

 

[dotpix]

Digging around I found out my card has deviceid 6610 (R7 250) but my hackintosh sees it as 683f (7750).

 

[Jithin.C.V]

View attachment 135134

Digging around I found out my card has deviceid 6610 (R7 250) but my hackintosh sees it as 683f (7750).

Added device id 6610, attached the modified kexts.

Download and install kexts with Kext Wizard.

Once it is installed, execute repair disk permissions and rebuild caches using the Kext Wizard (Check in Maintenance tab for these options)

Reboot and check whether card enabled or not.

 

[dotpix]

I checked on windows and it reports DEV_683F.

 

[Jithin.C.V]

I checked on windows and it reports DEV_683F.

Install the kexts from post#27

Don't forget to repair disk permissions & rebuilding caches.

 

[dotpix]

With your kext it works!
But if I try to use GraphicsEnabler=yes the monitor has no signal at all. Maybe I have to find the right framebuffer. I have a Sapphire Ultimate R7 250 (7750 - Cape Verde Pro). Any suggestions on AtiConfig and AtiPorts?