Yosemite 10.10.3 update, black screen after boot with R9 280x

[ch3m1c]

Hey folks!

I've been running 10.10.1 without any issues on my rig (in profile) with ASUS R9 280x + Dell u3415w (3440x1440) via Displayport.

But after I updated to 10.10.3 I get black screen after boot (screen goes standby, where should be login) even in safemode. If I switch it to HD4600 (via HDMI) in bios it boots and I can login.

I tried the AMDRadeonX4000.kext modifications, but as I understand these are for 270 (Cape Verde) cards, but 280x isn't that.

I'm using Clover.

Any suggestions? Thanks

 

[Jithin.C.V]

Hey folks!

I've been running 10.10.1 without any issues on my rig (in profile) with ASUS R9 280x + Dell u3415w (3440x1440) via Displayport.

But after I updated to 10.10.3 I get black screen after boot (screen goes standby, where should be login) even in safemode. If I switch it to HD4600 (via HDMI) in bios it boots and I can login.

I tried the AMDRadeonX4000.kext modifications, but as I understand these are for 270 (Cape Verde) cards, but 280x isn't that.

I'm using Clover.

Any suggestions? Thanks

Ensure that the ATI graphics injection is disabled on config.plist

Also set the PCIe/Graphics Card as your initial display port/primary video adapter on BIOS.

Then check the booting.

 

[ch3m1c]

Ensure that the ATI graphics injection is disabled on config.plist

Also set the PCIe/Graphics Card as your initial display port/primary video adapter on BIOS.

Then check the booting.

I see whole startup verbose text, just when it should start osx graphical interface.. screen goes standby. And no ATI injection used.

I currently rolled back to 10.10.1 with Timemachine till things are clear