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Displays dual screen issue

Discussion in 'Hardware' started by kim, 30 Jul 2020.

  1. kim

    kim hardware addict

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    Nothing is more annoying and stressing than something that works fine for months and suddenly stops working without any logical reason :miffed:
    I come to seek for your knowlege, or any idea that I wouldn't think about to solve this. Thanks by advance.
    here is the situation
    I use a dual screen on one of my PC, composed by a Compaq 220q PC monitor and a Toshiba TV.
    -The Compaq display is linked via a VGA/HDMI adaptor
    -The TV is linked by a HDMI/DP adaptor
    both are plugged on my RX 580
    Windows 10 display settings are set on " extended displays"

    It worked fine for several months, but today, Radeon software asked for an update, so I did it, and after restarting, only the Compaq display view the desktop, but the TV went black...:sad:

    I restarted again, same thing, so I took the basic steps to isolate the issue:
    - I checked through display options in Windows, and also in the Radeon software: nothing changed
    - I swapped the HDMI plug on the TV (there are 4 of it)
    - I tried the TV as a second display on another computer : it worked fine :naughty:
    Finally, I linked only the TV to the computer, removing the Compaq display, but the telly remained black :wallbash:
    This is where I am now, and I am pretty mad because it seems unlogical to me :rollingeyes:
    any ideas ?
     
  2. Bloody_Pete

    Bloody_Pete Technophile

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    What if you try mirroring the display?
     
  3. kim

    kim hardware addict

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    Thanks for such a fast reply bloody_pete, I've just tried that, but it didn't changed anything :rollingeyes:
     
  4. trig

    trig god's little mistake

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    probably not going to help but...linus had a video where, after trying everything in the world, he removed the adapter and went with a straight cable...so basically a cable with hdmi on one end and display port on the other (or something of that nature)...and it worked...as if the adapter was the problem...might be worth a try. those cables run pretty cheap here in the states

    edit...this was a recent video...trying to play games in 8k or something
     
  5. kim

    kim hardware addict

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    Thank you for your suggestion @trig, but the cable between the telly and the PC is precisely that type of straight cable
    [​IMG]
    And I checked the cable integrity by linking it on another PC, it must be something else...:idea:
     
  6. wyx087

    wyx087 Homeworld 3 is happening!!

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    This seems to be the only thing changed. Try going back to older driver?
     
  7. kim

    kim hardware addict

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    First of all, thank you for your reply @wyx087, yep, it was one of the first thing that came to my mind...after reading your suggestion, I checked the release notes about this update and I saw this:
    in the fixed issues...:grin:
    • Radeon RX Vega series graphics products may experience a system hang or black screen when running Folding@Home while also running an application using hardware acceleration of video content
    Mine isn't from the RX Vega serie but it's a RX still and @folding is active on this computer so...:sigh:

    and then in the known issues...
    • Enhanced Sync may cause a black screen to occur when enabled on some games and system configurations. Any users who may be experiencing issues with Enhanced Sync enabled should disable it as a temporary workaround
    All of this sounds pretty similar to what I experienced, so I will try to disable Enhanced sync first of all, and if it doesn't fix it, then I will try to go back to the previous driver...:rollingeyes:
    however, if changing drivers was an easy thing to do before, nowdays with the Radeon software wich is managing everything automatically, I don't know how to do that, but I will scour internet to find the way...
    Thanks again, I will post about the result.
     
  8. kim

    kim hardware addict

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    I'm pulling my hair out :wallbash: here are the latests things I tried today, and it's more and more unlogical :sigh:

    I disabled Enhanced Sync, but it didn't change anything

    I went back to the previous driver using the device manager, but absolutely no changings, the TV was still black

    A glance into the advanced display options of Windows 10 showed that the TV was listed but not detected :rollingeyes:

    I uninstalled @folding and tried all configurations without any results : black screen, black screen :wallbash:

    I tried with another TV, a more recent one, in dual screen mode and in single screen mode...same thing, in dual screen, only the PC screen is detected, and TV stays black but if I use the TV in single screen, it doesn't works neither via HDMI or DP :lol: :grin:

    I tried both TVs alone in single display via HDMI/HDMI and via HDMI/DP, using different cables : black screen :sad:

    I decided to remove the RX580 and to install another Graphic card, I had a spare R9 Fury so I plugged it and update drivers, but it's exatly the same f....g result :miffed: only the Compaq display is detected, all TVs remains black whatever I try...:waah:

    More incredible: once again I tried both TVs on another PC, and the result is exactly the same ...it works in single screen but dual screen isn't working anymore here :hehe:
    it drives me nuts :lol:
     
    Last edited: 31 Jul 2020
  9. kim

    kim hardware addict

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    some new clues...
    Well...I found the traitor :grr:...I didn't give up and I discovered that the HDMI/DP straight cable was defective, I was poking around with cables when I saw the desktop appear by lifting up the cable :eyebrow:
    I tried to link the TV with a straight HDMI cable and the Compaq display using a brand new VGA to DP adaptor, but now, the TV is the only display detected :hehe:
    Though, the Compaq display was showing the boot sequence when I started, but then it went dark, and while I am writing this, the power led is turning green every minut and the screen shows like if it was going to wake up... and the second after, it shutdown again :oldconfused:
    To get back to my dual screen set up, I had to install a second GPU and link both displays in HDMI, that's the only way I found ... I am aware that my Compaq is too old, the VGA connector and required adaptors are not suiting multi displays...
    I think I will just buy a new HDMI/DP cable, thank you very mutch to all those who replied for your time and advices, I myself, consider this thread closed.
     
    Last edited: 1 Aug 2020
    wyx087 likes this.

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