Screen turns black when monitor connected via HDMI: ThinkPad X270

Hey everyone,

After my last post, I can confirm I was able to get Monterey booted!

However, although most features seem to work, whenever I connect my external monitor via HDMI (it has a resolution of 1920x1200@60hz), my laptop screen goes black, and it doesn't even output anything!

It is quite disappointing to encounter this issue. As for one, I recently bought a new monitor. Two, I put in a lot of effort into creating the EFI. Lastly, as an iOS developer it would be quite difficult working on a 12" or so display.

Specifications:

  • Model: Thinkpad X270
  • CPU: Intel(R) Core(TM) i5-6300U CPU @ 2.50GHz
  • GPU: Intel HD Graphics 520
  • RAM: 4GB 2133MHz DDR4
  • Screen: 12,4" (1366x768)
  • Wi-Fi: AC-8260
  • Camera: 720p
  • Battery: 3-cell with inside battery

My EFI for reference: https://drive.google.com/drive/folders/1yZBM-zSVMB_BK7HcTWPkblbpjqUYMgTF?usp=drive_link.

I am pretty sure this issue does have a fix, as a lot of people online have been able to get HDMI working with this exact machine. I would greatly appreciate if someone can help me out here!

submitted by /u/0-pt1mu5
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