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Black screen after replacing my NVidia Card with Ati HD7850

sdancer75

sdancer75

Joined
Apr 5, 2011
Messages
26
Motherboard
Asus P5KPL-AM SE
CPU
Q9400
Graphics
GT 740
I installed a fresh copy of Catalina. I had no hardware acceleration with my NVidia card so, I replaced it with an AMD HD7850. Now I can not boot, I get a black screen. I tried to use the nv_disable=1 or ATI Inject without luck.

How can I boot with my new hardware?
 
  1. What manufacturer made the HD7850?
  2. Which display out connector are you using?
  3. Are you using any display out adapters?
  4. Have you added any failed ‘fixes’ for the dGPU, if yes, did you remove them once you realised they didn’t fix the issue?
  5. Did you uninstall the Nvidia Web Drivers and remove the Nvidia boot argument from the config.plist, before the dGPU swap?
  6. Have you tried unplugging and reinstalling the display cable to see if this refreshes the screen?
  7. Did you add the RadeonDeInit=true option to your config.plist, it is often required for older AMD GPU’s.
 
Edhawk said:
  1. What manufacturer made the HD7850?
  2. Which display out connector are you using?
  3. Are you using any display out adapters?
  4. Have you added any failed ‘fixes’ for the dGPU, if yes, did you remove them once you realised they didn’t fix the issue?
  5. Did you uninstall the Nvidia Web Drivers and remove the Nvidia boot argument from the config.plist, before the dGPU swap?
  6. Have you tried unplugging and reinstalling the display cable to see if this refreshes the screen?
  7. Did you add the RadeonDeInit=true option to your config.plist, it is often required for older AMD GPU’s.
Click to expand...
Hi Edhawk, thanks for your reply.

1. MSI HD7850 1GB https://www.techpowerup.com/gpu-specs/msi-hd-7850-oc-1-gb.b1238
2. I am using HDMI and DVI (2 monitors)
3. For the HDMI I am using an HDMI-2-RGB Converter and for the DVI I am using a DVI-2-RGB Converter (both monitors have RGB connectors only)
4. No I didn't add anything. I can not boot anymore, after Apple Logo both monitors go to sleep mode.
5. No, I just swapped the Video Cards
6. Yes, no success
7. No, I cannot access the boot USB or SSD Disk from my Windows copy (it can not recognize the disk format). Is there any way to access the EFI of the boot USB from Windows 10 to change the clover's config.plist? Currently, it seems that the only way to have access again to my both installations (SSD1. High Sierra and SSD2 Catalina) is re-installing my NVidia Card.

PS: I read somewhere that LGA7xxx CPUs need the SSE4.2_emulation kext to be able to use the AMD GPUs. Is that correct?
 
any help here?

PS : Will an Nvidia GT710 work with Catalina and 775 Mobos?
 
Yes, no need for Nvidia Web Drivers with that GPU as it is natively supported in macOS.
 
@Edhawk

This is my GPU Bios Rom. As already mentioned above, I connect my monitors with HDMI and DVI. Looking at the ROM description below, I can see that the 1st connector is the DisplayPort. Does this mean that the output is going thru DP and because of this, I always get the black screen to my HDMI or DVI connectors? If yes, is there any way to change this?



Code: 
ATOM BIOS Rom:
        SubsystemVendorID: 0x1462 SubsystemID: 0x2733
        IOBaseAddress: 0x0000
        Filename: V273BG.E01
        BIOS Bootup Message:
113-MSITV273MS.170 C40304 PITCAIRN PRO A1 GDDR5 32MX32 1GB
PCI ID: 1002:6819
Connector at index 0
        Type [@offset 44914]: DisplayPort (10)
        Encoder [@offset 44918]: INTERNAL_UNIPHY2 (0x21)
        i2cid [@offset 45024]: 0x90, OSX senseid: 0x1
Connector at index 1
        Type [@offset 44924]: DisplayPort (10)
        Encoder [@offset 44928]: INTERNAL_UNIPHY2 (0x21)
        i2cid [@offset 45051]: 0x91, OSX senseid: 0x2
Connector at index 2
        Type [@offset 44934]: HDMI-A (11)
        Encoder [@offset 44938]: INTERNAL_UNIPHY1 (0x20)
        i2cid [@offset 45078]: 0x92, OSX senseid: 0x3
Connector at index 3
        Type [@offset 44944]: DVI-I (2)
        Encoder [@offset 44948]: INTERNAL_UNIPHY (0x1e)
        i2cid [@offset 45115]: 0x95, OSX senseid: 0x6
Connector at index 4
        Type [@offset 44954]: DVI-I (2)
        Encoder [@offset 44958]: INTERNAL_KLDSCP_DAC1 (0x15)
        i2cid [@offset 45115]: 0x95, OSX senseid: 0x6
 
Yes there is away to configure the correct framebuffer for your old AMD card. See this guide.

www.tonymacx86.com

Radeon Compatibility Guide - ATI/AMD Graphics Cards

Radeon Compatibility Guide ATI/AMD Graphics Cards Last Change: December 2nd, 2017 The "boot to black screen" issue as well as the broken sleep/wake have been fixed! Read below for details. 0. Introduction Most of you might have noticed that the Buyer's Guide doesn't list a single...
www.tonymacx86.com www.tonymacx86.com

Section 3 is where the framebuffer patching guide starts.
 
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