Xendesktop 7.15 :- Screen starts to Flicker \ User are facing Black Screen as and when Launching ICA Session

Hi Guys,

This blog is continuation of my previous blog on screen flickering . If you haven’t read that then you can go and check out  the following link. The last fix was kind of a manual fix but this resolution should fix it from the VDA servers without any intervention from users. I have implemented the same fix in my environment .


So below are the environment details:

Environment details :-

VDA: 7.15 CU02

Server: 2012 R2

UPM 7.15.2001

Problem:- User  are facing Black Screen  as and when Launching ICA Session

VDIs are also showing below errors :-

Symptoms or Error :- 7.15 LTSR CU2 sessions might launch as a black screen. The issue occurs with sessions running on XenApp and XenDesktop 7.15 LTSR CU2 when Profile Management is enabled.

Note: Now before we make any changes on the VDA servers make sure to take a snapshot.

Steps that need to be followed to fix the issue:

First of all check the execution policy for the PowerShell and you can make it to unrestricted for the sake of the running the script .

  • set-executionpolicy unrestricted
  • Uninstall UPM 7.15.2000 through the PowerShell script. You can download the script through the link given at the bottom of the page .
  • Restart the VDA and install  UPM 7.15.2001.( The software is available from the same link given at the bottom of this article)
  • We can see that profile service started in services.msc and no issues observed .
  • Additionally as you  please try to upgrade workspace app on end points to fix flickering issues

VDA side -Registry fix for Multiscreen flickering

Open the registry (regedit) and navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\vbdenum

Increase the value of “MaxVideoMemoryBytes” REG_DWORD value to 134217728 (128 MB)


I hope this blog helps you in fixing the issues with black screen and flickering .

Articles followed :- –



Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Website Powered by WordPress.com.

Up ↑

%d bloggers like this: