What would cause Wyse C10LE Thin Clients to suddenly be unable to use dual displays after Windows Updates?

Question

Problem

We have a virtual Windows Server 2008 R2 x64 SP1 Remote Desktop server with a handful of users logging in from Wyse C10LE thin clients running the Linux-based Wyse ThinOS.
A user turned on automatic updates and the server automatically
installed updates and rebooted last night
When the users logged onto this server this morning, their display
settings were changed and their dual-displays were showing as one
large screen instead of two separate displays.
Users cannot change the display settings in a remote session.

Uninstalled the Windows Server 2008 R2 updates that were installed last night and rebooted. I left the Security Updates in place, I only removed updates under the "Microsoft Windows" heading in Programs and Features
Adjusted the Wyse thin client RDP connection display settings
Tried to adjust Remote Desktop Session Host Configuration settings and Group Policy settings to ensure multiple displays can be used with remote connections.

Windows Updates were installed by mistake
Remote Desktop connections from our Wyse thin clients won't allow dual displays, shows one very wide display
All Wyse and Windows display settings I can think of have been checked
Some of the updates that were installed by mistake have been uninstalled and another reboot has been performed

This is definitely Windows Update-related. The same thing happened on another one of our Remote Desktop servers. Out of 5 RD servers, only these two have display issues when logging in from the same Wyse thin clients. — Aaron, Oct 15, 2014 at 20:16
I moved on to the security updates that were installed last night and removed them all. There were almost 20 and each of them required a reboot to remove, so I wasn't able to determine which one was the culprit, but I will be reinstalling all these updates on a test server of similar configuration so I can figure out which update caused it. — Aaron, Oct 15, 2014 at 20:33
If you or anyone else affected by this issue would like a support case set up with Microsoft, please contact Susan Bradley - see blogs.msmvps.com/bradley/2014/10/24/… — Harry Johnston, Oct 24, 2014 at 23:15

pauska · Accepted Answer · 2014-10-16 09:02:51Z

2

Microsoft Update KB2984972 - Uninstall this and reboot the host.

We had the identical issue today after automatic updates were applied.

pauska

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answered Oct 16, 2014 at 8:44

Andrew Jackson

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Thanks very much. You just saved me a lot of time trying to narrow down which of the 60 updates was the culprit.
– Aaron
Oct 16, 2014 at 13:46

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