External monitor does not display BIOS or pre boot

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  1. sygnus21's Avatar
    Posts : 5,755
    Win 10 Pro (x64) 21H1 (19043.1023
       #11

    antares said:
    Thanks sygnus for your detailed reply. Let me clarify some points here to clear any dust:
    1) When REBOOTING (boot=reboot) yes, there is an instant of maybe a few milliseconds during which no power is being delivered, not even to the internal laptop display. During this instant it is normal that both the internal display and any external display appears black
    2) As soon as the Dell logo shows up in the laptop's internal display the POST (pre windows) stage begins. It is during this POST process (where eventually by pressing F12 you can enter BIOS, or pressing F8 you can enter the boot menu) that the external thunderbolt monitor DOES NOT receive any signal from the laptop, hence displaying a black screen and a message saying "no thunderbolt detected, entering standby mode". THIS IS THE ISSUE I'M TRYING TO FIX, because things as they are if I want to see the BIOS menu or any POST process I have to open de laptop's lid and check POST from the laptop's internal display, which is very inconvenient.
    3) Eventually once Windows loads the external monitor displays the normal windows desktop, no problem here.
    1) Yes, I'm aware of this and why I said what I said about rebooting/booting, thus we agree here.

    2) Not surprised here as I'd already stated the Thunderbolt port probably wouldn't fully initialize until you get into Windows.

    3) That goes directly to point 2 - The port won't fully initialize until Windows is active. Some systems might allow the port to work without Windows being active, but it appears your laptop doesn't allow that. Add that you also said "found a setting in BIOS that says like "enable direct Thunderbolt in BIOS". If that didn't work, well...

    To be honest there's nothing surprising about anything you posted here where the PC is doing what you say, especially since this is a laptop we're talking about. Now if you find a way around it, I'd be more than happy to hear what you did to get it working.

    Peace
      My Computers

  2. sygnus21's Avatar
    Posts : 5,755
    Win 10 Pro (x64) 21H1 (19043.1023
       #12

    @antares,

    Does your laptop have an HDMI port? If so, you could try using the HDMI port to see if external monitor initializes once the post starts. To be honest, I wouldn't be surprised one way or the other (laptop thing).

    Let me know
      My Computers


  3. Posts : 163
    Windows 10x64 Pro
    Thread Starter
       #13

    sygnus21 said:
    @antares,

    Does your laptop have an HDMI port? If so, you could try using the HDMI port to see if external monitor initializes once the post starts. To be honest, I wouldn't be surprised one way or the other (laptop thing).

    Let me know
    Hi sygnus, no, the XPS 9710 only has 4 thunderbolt 4 ports. I could use a USB C to HDMI adapter, but that wouldn't change anything as the original signal is still being delivered by Thunderbolt. I do own also an XPS 9570 laptop which has a built in HDMI port and used it several years, and I always was able to display in my external monitor (a different one that I use with the XPS 9570, not the UP2720Q) every stage of a reboot, POST+Windows.
    One thing I could try is disable in BIOS the setting "Direct Graphics Controller Direct Output Mode". When enabled, the graphics signals are sent to the external display using the discrete graphics card (Nvda RTX 3060) instead of integrated graphics (Intel). By default, this mode is disabled in the BIOS. Of course I enabled it from the start to make best use of the UP2720Q monitor with the Nvda GPU and not Intel's. But as a test I could try disabling this feature, maybe the onboard INtel GPU does send a signal thru the thunderbolt during POST
    Yes of course, I also contacted Dell, but they basically said that if after everything I tried (which I also posted here) I was unable, then that feature is not available.
      My Computer


 

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