Difference between revisions of "External display adapters support"

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(Created page with "Background: all USBC MacBooks support external screens, however it is not that easy to get a picture on Filevault login / Recovery / Boot menu. The problem is that USBC Displa...")
 
 
(3 intermediate revisions by the same user not shown)
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Background: all USBC MacBooks support external screens, however it is not that easy to get a picture on Filevault login / Recovery / Boot menu. The problem is that USBC Display negotiation starts only after GPU driver is loaded, which will never happen if you are not able to click on your password field and type password. The common technique is to physically disconnect internal screen and to fiddle with connectors till something works. However on some T2 models it looks like even then, there might be no external picture. This issue looks pretty obscure and funny but i see no better way but to test every device i have my hands on and to build up a table with known-good cable combinations. To do the trick, connect external keyboard/mouse, turn on the device and immidiately close the lid. Boot logo should appear on external screen even before the Filevault login.
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Background: all USBC MacBooks support external screens, however it is not that easy to get a picture on Filevault login / Recovery / Boot menu. The problem is that USBC Display negotiation starts only after GPU driver is loaded, which will never happen if you are not able to click on your password field and type password. The common technique is to physically disconnect internal screen and to fiddle with connectors till something works. However on some T2 models it looks like even then, there might be no external picture. This issue looks pretty obscure and funny but i see no better way but to test every device i have my hands on and to build up a table with known-good cable combinations. To do the trick with internal screen connected, connect external keyboard/mouse, hard shut down and then turn on the device and immidiately close the lid(it should chime with lid closed). Boot logo should appear on external screen even before the Filevault login thus indicating you are able to backup data before you fix the screen.
  
 
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=== MacBook 13" with integrated Intel GPU ===
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===MacBook 13" (iGPU)===
 
USBC-DP ([https://www.cablematters.com/pc-967-124-cable-matters-unidirectional-usb-c-to-mini-displayport-cable-usb-c-to-mini-dp-cable-supporting-4k-60hz-6-feet-usb-c-thunderbolt-3-port-compatible-for-video-only-not-compatible-with-hard-drives.aspx Cable Matters USB C Mini DisplayPort]) as '''DP1''' in table(add your cables)
 
USBC-DP ([https://www.cablematters.com/pc-967-124-cable-matters-unidirectional-usb-c-to-mini-displayport-cable-usb-c-to-mini-dp-cable-supporting-4k-60hz-6-feet-usb-c-thunderbolt-3-port-compatible-for-video-only-not-compatible-with-hard-drives.aspx Cable Matters USB C Mini DisplayPort]) as '''DP1''' in table(add your cables)
  
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|USBC > DisplayPort
 
|USBC > DisplayPort
 
|USBC > HDMI
 
|USBC > HDMI
|USBC > USBC  
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|USBC > USBC
 
|USBC HUB with HDMI/DP/Etc
 
|USBC HUB with HDMI/DP/Etc
 
|-
 
|-
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|-
 
|-
 
|MacBook 2018-2019 A1989
 
|MacBook 2018-2019 A1989
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(Same results with internal display disconnected)
 
|DP1
 
|DP1
 
|X
 
|X

Latest revision as of 10:03, 28 April 2021

Background: all USBC MacBooks support external screens, however it is not that easy to get a picture on Filevault login / Recovery / Boot menu. The problem is that USBC Display negotiation starts only after GPU driver is loaded, which will never happen if you are not able to click on your password field and type password. The common technique is to physically disconnect internal screen and to fiddle with connectors till something works. However on some T2 models it looks like even then, there might be no external picture. This issue looks pretty obscure and funny but i see no better way but to test every device i have my hands on and to build up a table with known-good cable combinations. To do the trick with internal screen connected, connect external keyboard/mouse, hard shut down and then turn on the device and immidiately close the lid(it should chime with lid closed). Boot logo should appear on external screen even before the Filevault login thus indicating you are able to backup data before you fix the screen.


MacBook 13" (iGPU)

USBC-DP (Cable Matters USB C Mini DisplayPort) as DP1 in table(add your cables)

USBC-HDMI (Uni USB C to HDMI) as HDMI1

USBC HUB (Anker 8-in-1 USB-C Hub) + normal HDMI-HDMI Cable as HUB1

This table indicates MAIN image on external screen with internal screen PRESENT
Device USBC > DisplayPort USBC > HDMI USBC > USBC USBC HUB with HDMI/DP/Etc
MacBook 2016-2017A1708/A1706 DP1 X X HUB1
MacBook 2018-2019 A1989

(Same results with internal display disconnected)

DP1 X X HUB1