Archive | December, 2019

Black Screen on mobile devices during logon – VMware Horizon and VMware Workspace One

17 Dec

We had a strange issue in which end-users reported a black screen when they clicked on their Desktop tile in Workspace One portal on their mobile devices on Android and iOS. The moment they clicked on the endpoint the black screen would go away and it would give the logon banner and normal Windows 10 logon.

Usual Suspects

Our investigation led to Windows Logon Banner applied via the group policy causing the black screen. We were soon able to rule out by disabling the logon banner and the black screen persisted.
The black screen only appear on mobile devices. The Desktop/Laptops you didnt observe the issue.

EUC Stack

VMware Horizon 7.6
VMware App Volumes 2.14.2
VMware Identity Manager 3.3
VMware User Environment Manager 9.4
Windows 10 1803

Resolution

We managed to open the VMware GSS case and a lot of troubleshooting was carried out from re-running the VMware OSOT tool and changing the Power Configuration policy.

The final configuration that resolved the black screen issue:

Open the master image and run PowerShell with administrative rights and execute the following commands:

powercfg -change -monitor-timeout-ac 0
powercfg -change -monitor-timeout-dc 0

(Note – Here 0 means Never)

ScreenSettings

Power and Screen Settings – Windows 10

Make sure you restart the master template post implementing the commands . Take a snapshot and perform “Push-Image” operation in Horizon Administror console.

I hope you will find this information useful if you encounter the Black Screen issue. A big thanks to Manivannan Arul my teammate for his continoursly effort while troubleshooting with GSS.

Thanks,
Aresh Sarkari

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