Monitor on but black display

longplaypg · 10-30-2013, 04:48 PM

Left 3 RDP sessions open on the dual screens.
1 on the main display and 2 on the secondary display all in full screen mode using single monitors.
Laptop screen was closed.
Step away long enough for the computer to turn off the display (30 mins currently).
Pressed shift on the keyboard and screens went from sleep yellow to awake green.
Main monitor was displaying video correctly and showing my main RDP.
Secondary monitor was black and no video even though the green light indicated it was awake.
Tried to drag the working RDP window onto the secondary monitor and it stayed black.
Started the displaylink support tool.
Prompted for user account control
Noticed second screen was now showing video again even though it was darkened because of the UAC prompting
Once I accepted the UAC it was fully working again and could be interacted with.

Sadly I did not have advanced displaylink logging on so when I turned it on the displaylink service was reset

I did not reset the displaylink debug information so hopefully something is still in there.

Prior to this I have been using 7.4 M2 with the laptop lid open and all 3 screens active. The screens have gone to sleep many times and all 3 have woken up properly and displayed video. I am not sure why having the Lid closed and only the 2 displaylink monitors active makes a difference.

System compatibility check

Pass: Basic mode support
Pass: Device attached
Pass: Device started correctly
Pass: Graphics driver date
Pass: WEI is above recommended 3
Pass: No Other USB graphics software installed

System hardware and connections

Dell Precision M4300
USB 2.0 ports only
Windows 7 Enterprise SP1 32 bit
Kensington Sd3500v
USB 2.0 laptop to Kensington USB 3.0 input (using usb 3.0 cable)
Kensington Heaphone jack plugged into headset
Microphone jack plugged into headset
Ethernet cable attached to 1G switch
DVI to VGA adapter
VGA adapter to main monitor via vga cable
HDMI to DVI adapter
DVI adapter to main monitor via HDMI cable
Power plugged into AC
Kensington usb 2.0 out to Main monitor usb input
Main monitor USB
Dell USB keyboard
Dell USB mouse