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Viren_Manek's avatar
Viren_Manek
Brass Contributor
Mar 28, 2021
Solved

When screen sharing people see black screen

Hi, I had Thinkpad laptop and was using additional monitor on and off without any issues and suddenly since 2-3 weeks, when I am trying to share my screen, people are just seeing black screen. This ...
Black Screen
Sharing
Teams App
  • Tenny_Aus's avatar
    Tenny_Aus
    May 20, 2021

    Hi Viren_Manek;

     

    Believe is ISP related.

    Change the QoS setting in Teams fixed the problems for us. 

    Your tenant admin needs to change this:

    Teams Admin> Meetings > Meeting Settings > Network 

    Turn off -> Insert Quality of Service (QoS) markers for real-time media traffic

     

    Also update Teams client to the latest version.

    Log-out and log back in.

    Restart your Teams app.

     

    You may need to wait for the change to kick in.

    Good luck.

     

    Regards

    Tenny

     

Adriana_001's avatar
Adriana_001
Copper Contributor
Jul 01, 2021

Adriana_001 update overnight is that my issue has now been fixed - I can share my screen in Team while using the Huawei modem. I have no idea who and what was done. A bit concerning when I don't know what happened / what was done to resolve the issue.

Adriana_001's avatar
Adriana_001
Copper Contributor
Jul 07, 2021
Update 7th July - update overnight is that IPRIMUS has fixed the issue. They said many people had called with the same "Black Screen" issue when sharing your screen in MS Teams. They did not say exactly what they did.
  • atlacatl's avatar
    atlacatl
    Copper Contributor
    Jul 08, 2021
    As for a suggestion of a mate of mine, I entered a registry key to disable QoS all together for Teams. My understanding has been that you have to deploy a GPO to enable QoS for Teams as per following article: https://docs.microsoft.com/en-us/microsoftteams/qos-in-teams-clients. But it looks like that Teams desktop client is getting its QoS policy from the server, by the setting "Meetings\Meetings Setting\Network\Insert Quality of Service (QoS) markers for real-time traffic". This is my opinion, since I have not found any information to back it up.
    How I fix it:
    1. I created the registry key "HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\QoS" and the following registry entries under it (this entries are in the article but with the QoS values):
    Name: Application Name
    Type: REG_SZ
    Data: Teams.exe

    Name: DSCP Value
    Type: REG_SZ
    Data: 0 (This is Zero to disable QoS)

    Name: Local IP
    Type: REG_SZ
    Data: *

    You need to reboot.
    Apparently, Microsoft is coming up with a fix in August.
    • JulieKeena's avatar
      JulieKeena
      Copper Contributor
      Jul 08, 2021

      atlacatl Tried registry fix & did not resolve the issue. 

       

      I have spoken to Dodo technicians & been advised they are aware of the issue (approx 5000 customers are affected). It has been escalated & they are working closely with other ISP's & Microsoft to get it fixed.

       

      Received an SMS from Dodo 1/7 "Your MS Teams apps issue is still under investigation by the network team. We will get in touch with you as soon as we have further updates"

       

      I will be ringing them again today or tomorrow & hopefully get a more recent update for us all

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