manhhungdoan Posted February 26, 2021 Share Posted February 26, 2021 My laptop has touchscreen. When connecting HDMI output, external display works but internal LCD goes dark. How to fix it? Here are my IOReg and EFI files: IOReg and EFI files Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted February 26, 2021 Moderators Share Posted February 26, 2021 Same issue as my E7470 (Skylake) but without touchscreen. You could try EDID or use the workaround I suggested in my guide. Close the laptop cover for a second and then reopen it or place system in a sleep cycle before connecting to HDMI. Link to comment Share on other sites More sharing options...
manhhungdoan Posted February 27, 2021 Author Share Posted February 27, 2021 I tried your way out and it works. however, built-in screen flickering after I plugged in HDMI and It must be reboot sys before it will be fixed. Link to comment Share on other sites More sharing options...
Moderators Jake Lo Posted February 27, 2021 Moderators Share Posted February 27, 2021 You have con2 as HDMI, try it on Con1. That's how it's set on my E7470. You can verify in IOReg file Link to comment Share on other sites More sharing options...
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