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I have disconnected the laptop screen from the motherboard, and now I'm using an external display, which is connected via HDMI (see first image below).

It's already set to only show on Display 2 on screen configurations but I can't see the boot screen or nothing like that. The screen only shows something when it's loading windows. The VGA also doesn't work.

Edit: I need to see the boot screen because I'm trying to do a dual boot with Ubuntu.

External display, which is connected via HDMI: external display, which is connected via HDMI)

Seth
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Jean Nunes
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1 Answers1

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You cannot see the boot process on the external monitor, since the BIOS does not have the drivers necessary for using HDMI. The BIOS will only use the primary connection (that you have disconnected) in VGA mode.

If your laptop screen is broken, you can still use the computer, but not the BIOS. When Windows boots up after the BIOS, it will detect the HDMI connection and use it for display, so the Windows login is where you will begin to see anything.

Your situation is entirely normal and correct for your setup.

harrymc
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  • But i'm trying to make a dual boot with Ubuntu. That is the problem :( – Jean Nunes May 03 '19 at 20:19
  • I don't see the connection between your post and dual boot. If you wish to update grub boot, you don't need the BIOS. – harrymc May 03 '19 at 20:29
  • Everytime i go to "advanced startup options" and check the usb, the notebook stays running but no image. – Jean Nunes May 03 '19 at 20:39
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    I don't really understand. I think it would be better if you add all the pertinent details to your post, including screenshots. – harrymc May 03 '19 at 20:42
  • i have added some images @harrymc – Jean Nunes May 06 '19 at 16:25
  • With that setup you're probably not able to see your BIOS at all, right? So what harry said would still apply. In order to have "pre-boot" images you'd need to use the internal connector because you BIOS is likely set to only use that during boot. – Seth May 07 '19 at 10:26
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    This answer is wrong. Bios only cares about finding the right GOP driver or legacy option ROM, end. Display handling is simply a matter of what's coded in said firmware (which I'm afraid some laptops OEM may have screwed up). As a matter of fact my Asus X756UX, if booted with an HDMI cable already plugged in, will show the UEFI interface on the external monitor.. in all its 1280x1024 glory. – mirh Feb 05 '21 at 02:39
  • @mirh: The subject here is the poster's BIOS, not yours. You're off-subject. – harrymc Feb 05 '21 at 07:39
  • You also didn't say a thing about OP's laptop that he didn't already know (not that anybody could have anyway, since not even the manufacturer is mentioned). The theory isn't right though, especially considering the literally dozens of workarounds he still could have tried. – mirh Feb 05 '21 at 15:29
  • @mirh: Post up your answer and leave mine in peace. – harrymc Feb 05 '21 at 15:35