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Multi-Monitor Annoyance

Discussion in 'Videocards - AMD Radeon' started by Voxoid, Apr 10, 2019.

  1. Voxoid

    Voxoid New Member

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    GPU:
    MSI RX580 Armor 8GB
    Hey guys, I'm having a bit of trouble with my new RX580 and wondering if there's a possible way to fix it.

    I recently upgraded to an RX580 from a 7970.

    With multi-monitor mode on my 7970 I could turn off my 2nd monitor with the power button and multi-monitor mode would stay active and keep all of my windows open even though the monitor was off. Now with my RX580 if I turn the 2nd monitor off, the monitor gets disabled and the pc goes back to single monitor mode, shifting all open windows to my main monitor.

    Is there some way to stop this happening?
     
  2. GSDragoon

    GSDragoon Member Guru

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    GPU:
    AMD Radeon VII
    I ran into the same problem. Was using Nvidia and DVI for years. Then I upgraded to a Radeon VII and new monitors with display port. It's an AMD and/or DP thing. I didn't have the problem using a DP adapter to DVI with the older monitors and the Radeon. What connection type are you using?
     
  3. Voxoid

    Voxoid New Member

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    GPU:
    MSI RX580 Armor 8GB
    My main monitor is HDMI and the 2nd is DVI
     
  4. GSDragoon

    GSDragoon Member Guru

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    GPU:
    AMD Radeon VII
    Does turning off the main monitor change things? I have a TV using HDMI as a 3rd screen and turning it on our off doesn't do anything.
     

  5. Voxoid

    Voxoid New Member

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    GPU:
    MSI RX580 Armor 8GB
    Nah, I can turn my main monitor off and everything stays normal. I just tried "Make this my main display" on my 2nd monitor in windows, but if I turn it off it still just disconnects the monitor and moves everything back to the first.
     
  6. Caesar

    Caesar Master Guru

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    GPU:
    GTX 1070Ti Titanium
    Look for the monitor drivers (NOT from Microsoft). Install them.
     
  7. Voxoid

    Voxoid New Member

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    GPU:
    MSI RX580 Armor 8GB
    Found the Acer monitor drivers and installed them with no trouble but unfortunately there's no change.
     
  8. MaCk0y

    MaCk0y Master Guru

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    GPU:
    RX 580 Red Devil
    Connected the second monitor to the RX580 and it stays multi monitor when turning it off. Using a DVI to HDMI cable. I changed it to a DVI to DVI cable and it still works fine when switching it off. But I connect the second monitor to the Intel iGPU which you could use as a workaround.
     
  9. Only Intruder

    Only Intruder Maha Guru

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    GPU:
    Sapphire Fury Nitro
    This is a "feature" I'm afraid. Monitors using displayport and modern HDMI monitors have plug and play capability, so when you turn the monitor off, windows knows it has turned off and so resets the desktop to one monitor.

    Now supposedly for AMD cards (after a little googling), if you disable "AMD External Events Utility" in the services tab in Task Manager, this prevents this behaviour however I tried it myself and it didn't. I've done a little more googling and it seems there is a registry setting that can be edited (found here https://superuser.com/questions/120983/how-to-disable-monitor-auto-detection-in-windows-7 ) which suggests editing "DMMEnableDDCPolling" I have no idea if this works or not, I haven't tested it (again this is for AMD cards).
     
  10. Voxoid

    Voxoid New Member

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    GPU:
    MSI RX580 Armor 8GB
    Thanks for that link, I feel like it might be pushing me in the right direction. Unfortunately, none of those registry keys or other management options seem to be present on Windows 10. Disabling the AMD External Events services and restarting doesn't help either.

    I'll keep playing around with it and hopefully find a way to fix it then I'll post it here if I'm successful.

    Thanks everyone for your help.
     

  11. nikobellic

    nikobellic New Member

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    GPU:
    Nitro+ RX 480 8GB OC
    I have been using dual monitor setup with rx 480 for more than two years, my primary monitor is HDMI freesync monitor and 2nd monitor is DVI. Not once I encountered this behavior. I just tried it, and it does not switch to single monitor mode when I power down the the secondary monitor. I could even turn off only the primary monitor and nothing happens.
     
  12. Voxoid

    Voxoid New Member

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    GPU:
    MSI RX580 Armor 8GB
    Yeah, my setup used to work like that when I had my 7970. The only thing that changed in my rig when I changed GPUs was the rx580 and a fresh install of the AMD drivers.

    At the moment I don't think it's the drivers but a "feature" built into this particular MSI card to allow the memory to go into low power mode. When the 2 monitors are on it stays at 2000mhz at all times until the 2nd is turned off, then it drops to 300mhz.

    I tried running Linux the other day and noticed that multi-monitor is disabled when I turn the second monitor off there too, which didn't happen with my 7970 either. So for now I think that I'll just have to put up with it happening.
     
  13. nikobellic

    nikobellic New Member

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    GPU:
    Nitro+ RX 480 8GB OC
    Possible, could be a feature of MSI, I have a sapphire rx 480 and it does not have this feature.
     
  14. Voxoid

    Voxoid New Member

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    GPU:
    MSI RX580 Armor 8GB
    Quick update, I just replace my second monitor with a new monitor that is the same model as my main one and the problem is gone. Both monitors run off HDMI now and I can switch them both off freely.
     
    Jackalito and fantaskarsef like this.

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