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MP 1,1-5,1 **SOLVED** No Boot Screen OCLP RX6600XT

D

dksoutha

macrumors member
Original poster
Mar 5, 2012
36
1
Hi all,

Specs:
cMP 4,1/5,1
Monterey 12.6.1 on SATA SSD
WIN10 on dumb NVME PCI-e adapter
OCLP 0.5.1
Sapphire Pulse RX6600XT
LED Cinema Display 24" (A1267)

After flashing the 6600 and installing it in the cMP, I cannot see the OCLP boot picker. OCLP is working since the cMP boots into Monterey. I tried reinstalling OCLP yet still cannot see the boot picker. My MVC RX580 shows the boot picker and allows booting to both MacOS and WIN10, yet after pulling the 580 the only video output on the 6600 happens after it starts to load one of the OSs.

I have tried all the ports, including HDMI with a different monitor, plus different DPI-MiniDPI adaptors.

Sorry if I overlooked a thread on this site that resolves my issue. The thread discussing the MVC 6600 did not address my issue.

Thanks in advance.
 
Hi Alex,

Thanks for your reply. I read the thread earlier today and see the OP did not find a solution and appears to have given up, so I assumed no fix could be found in the thread. I will try your suggestion, but with a more modern monitor than the two I tried earlier.
 
tsialex to the rescue again. SOLVED

Newer monitor, in this case on the HDMI port, and I have a clear boot picker.

Thanks as always!
 
tsialex said:
24" Cinema Display have a non-standard/non-commonplace 1920x1200 screen resolution with EDID issues that is incompatible with MVC pre-boot configuration support or OC GOP support.
Click to expand...
Remember the linked thread but from looking at a RefindPlus log recently shared by @gtackett in the MyBootMgr thread, https://forums.macrumors.com/posts/31712518, he is apparently running an MP51 with a flashed GPU that plays well with a 1920 x 1200 rez monitor.

Not sure why the outcome is different assuming the GPU flash was done by the same outfit and that it is the same monitor. The needed resolution is being picked up correctly by both the UGA and GOP instances present on the GPU.
 
Dayo said:
Remember the linked thread but from looking at a RefindPlus log recently shared by @gtackett in the MyBootMgr thread, https://forums.macrumors.com/posts/31712518, he is apparently running an MP51 with a flashed GPU that plays well with a 1920 x 1200 rez monitor.

Not sure why the outcome is different assuming the GPU flash was done by the same outfit and that it is the same monitor
Click to expand...
The issue at play is not really the 1920x1200 resolution, while not exactly a very common one, I have a Samsung T240M 24" display with the same 1920x1200 that works perfectly with a MVC flashed Quadro K2000 or MVC flashed GT630 for pre-boot configuration, while the Cinema Display with the exact same resolution won't.

Also, the T240M display works with several other resolutions, almost everything that you can throw at it, while the Cinema Display won't.

Btw, there are two Apple displays with 1920x200, the Cinema Display 23" and the LED Cinema Display 24", I have the older one with a black blotch on the LCD, not really usable besides tests.
 
Last edited:
I see. Would be interesting to confirm the monitor being used by @gtackett.

I just dumpster dived my way to a battered but working 20" ACD. I have a flashed Titan X stashed somewhere I would test it on later.
 
Dayo said:
I see. Would be interesting to confirm the monitor being used by @gtackett.
Click to expand...
I supposed is this one, from @gtackett SystemInformation report. Also, not a MVC flashed GPU.

Screen Shot 2022-11-09 at 03.51.32.png

Dayo said:
I just dumpster dived my way to a battered but working 20" ACD. I have a flashed Titan X stashed somewhere I would test it on later.
Click to expand...
1680x1050, also a non commonplace display resolution.
 
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tsialex said:
Also, not a MVC flashed GPU.
Click to expand...
I assume the R9 280X does not support bootscreen OOB. The RP log shows the GPU is a UGA/GOP hybrid. This indicates flashing as "Officially" supported Mac GPUs seen so far are UGA only. Presumably self/other flashed due to some MVC signature that is missing in the report?

tsialex said:
1680x1050, also a non commonplace display resolution.
Click to expand...
Tested as working with HD 5450 so far. Will do RX 580 and the Titan X later.
 
Dayo said:
I assume the R9 280X does not support bootscreen OOB. The RP log shows the GPU is a UGA/GOP hybrid. This indicates flashing as "Officially" supported Mac GPUs seen so far are UGA only. Presumably self/other flashed due to some MVC signature that is missing in the report?


Tested as working with HD 5450 so far. Will do RX 580 and the Titan X later.
Click to expand...
Btw, today I've found about displayplacer, both homebrew and MacPorts have it, it's a nice and free command line tool to show all the display modes available:

Code: 
Mavericks:~ alexandretorres$ displayplacer list
Persistent screen id: E87EC32E-70E1-EA26-987A-3058093C7B77
Contextual screen id: 188802360
Type: 19 inch external screen
Resolution: 1440x900
Hertz: 60
Color Depth: 4
Scaling:off
Origin: (0,0) - main display
Rotation: 0
Resolutions for rotation 0:
  mode 0: res:848x480 hz:60 color_depth:3
  mode 1: res:848x480 hz:60 color_depth:4
  mode 2: res:848x480 hz:60 color_depth:4
  mode 3: res:1280x960 hz:75 color_depth:3
  mode 4: res:1280x960 hz:75 color_depth:4
  mode 5: res:1280x960 hz:75 color_depth:4
  mode 6: res:1360x768 hz:60 color_depth:3
  mode 7: res:1360x768 hz:60 color_depth:4
  mode 8: res:1360x768 hz:60 color_depth:4
  mode 9: res:1440x900 hz:60 color_depth:3
  mode 10: res:1440x900 hz:60 color_depth:4 <-- current mode
  mode 11: res:1440x900 hz:60 color_depth:4
  mode 12: res:1280x1024 hz:60 color_depth:3
  mode 13: res:1280x1024 hz:60 color_depth:4
  mode 14: res:1280x1024 hz:60 color_depth:4
  mode 15: res:1280x960 hz:60 color_depth:3
  mode 16: res:1280x960 hz:60 color_depth:4
  mode 17: res:1280x960 hz:60 color_depth:4
  mode 18: res:800x600 hz:60 color_depth:3
  mode 19: res:800x600 hz:60 color_depth:4
  mode 20: res:800x600 hz:60 color_depth:4
  mode 21: res:800x600 hz:56 color_depth:3
  mode 22: res:800x600 hz:56 color_depth:4
  mode 23: res:800x600 hz:56 color_depth:4
  mode 24: res:640x480 hz:75 color_depth:3
  mode 25: res:640x480 hz:75 color_depth:4
  mode 26: res:640x480 hz:75 color_depth:4
  mode 27: res:640x480 hz:73 color_depth:3
  mode 28: res:640x480 hz:73 color_depth:4
  mode 29: res:640x480 hz:73 color_depth:4
  mode 30: res:640x480 hz:67 color_depth:3
  mode 31: res:640x480 hz:67 color_depth:4
  mode 32: res:640x480 hz:67 color_depth:4
  mode 33: res:640x480 hz:60 color_depth:3
  mode 34: res:640x480 hz:60 color_depth:4
  mode 35: res:640x480 hz:60 color_depth:4
  mode 36: res:1280x1024 hz:75 color_depth:3
  mode 37: res:1280x1024 hz:75 color_depth:4
  mode 38: res:1280x1024 hz:75 color_depth:4
  mode 39: res:1024x768 hz:75 color_depth:3
  mode 40: res:1024x768 hz:75 color_depth:4
  mode 41: res:1024x768 hz:75 color_depth:4
  mode 42: res:1024x768 hz:70 color_depth:3
  mode 43: res:1024x768 hz:70 color_depth:4
  mode 44: res:1024x768 hz:70 color_depth:4
  mode 45: res:1024x768 hz:60 color_depth:3
  mode 46: res:1024x768 hz:60 color_depth:4
  mode 47: res:1024x768 hz:60 color_depth:4
  mode 48: res:832x624 hz:75 color_depth:3
  mode 49: res:832x624 hz:75 color_depth:4
  mode 50: res:832x624 hz:75 color_depth:4
  mode 51: res:800x600 hz:75 color_depth:3
  mode 52: res:800x600 hz:75 color_depth:4
  mode 53: res:800x600 hz:75 color_depth:4
  mode 54: res:800x600 hz:72 color_depth:3
  mode 55: res:800x600 hz:72 color_depth:4
  mode 56: res:800x600 hz:72 color_depth:4
  mode 57: res:1152x870 hz:75 color_depth:3
  mode 58: res:1152x870 hz:75 color_depth:4
  mode 59: res:1152x870 hz:75 color_depth:4
  mode 60: res:800x500 hz:60 color_depth:3
  mode 61: res:800x500 hz:60 color_depth:4
  mode 62: res:800x500 hz:60 color_depth:4
  mode 63: res:1024x640 hz:60 color_depth:3
  mode 64: res:1024x640 hz:60 color_depth:4
  mode 65: res:1024x640 hz:60 color_depth:4
  mode 66: res:1280x720 hz:60 color_depth:3
  mode 67: res:1280x720 hz:60 color_depth:4
  mode 68: res:1280x720 hz:60 color_depth:4
  mode 69: res:1280x800 hz:60 color_depth:3
  mode 70: res:1280x800 hz:60 color_depth:4
  mode 71: res:1280x800 hz:60 color_depth:4
  mode 72: res:1344x840 hz:60 color_depth:3
  mode 73: res:1344x840 hz:60 color_depth:4
  mode 74: res:1344x840 hz:60 color_depth:4
  mode 75: res:1440x810 hz:60 color_depth:3
  mode 76: res:1440x810 hz:60 color_depth:4
  mode 77: res:1440x810 hz:60 color_depth:4

Execute the command below to set your screens to the current arrangement:

displayplacer "id:E87EC32E-70E1-EA26-987A-3058093C7B77 res:1440x900 hz:60 color_depth:4 scaling:off origin:(0,0) degree:0"
 
Dayo said:
"Officially" supported Mac GPUs seen so far are UGA only.
Click to expand...

Most AppleOEM GPUs have both UGA (for MacPro1,1 to 3,1) and AppleGOP (for MacPro4,1 to 5,1) EFI modules. Some of the oldest AppleOEM GPUs only have UGA, like the 7300GT.

Apple only abandoned AppleGOP with MacMini8,1, where any modern UEFI GOP GPU provides pre-boot configuration support with eGPUs.
 
Will check displayplacer later. Looks like a useful item in to have in the toolbox.

On the GPUs, so far, all those with native Mac EFI I have seen logs from, including the HD 5450 and HD 5770 from 2009/2010 are UGA only and all the UGA/GOP Hybrids I have seen so far have either been self flashed or flashed by MVC. Not a comprehensive dataset though.
 
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