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 .

When-we-turn-on-receiver-the-screen-starts-to-flicker-in-citrix-7-15

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)