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Forums -> Multiple monitors -> Top Monitor not active upon start up from prior session, restart solves
Monte Carlos   2023-01-11 20:16
I leave my Windows 10 PC running, with the SSD
drive ... I've been using Ultramon, latest version
for over a decade, i have the latest version 3.4.1

Just lately, December on, when I sit down and activate the PC from sleep or standby the upper
monitor (vertical stack 2 HP w2207's) is dark
while the lower monitor #2 is active ...nothing
seems to get the upper monitor going except a
'restart' whereby my browser tabs in Chrome are
lost.

This is a new issue, I've had this PC well over a year now with flawless Ultramon performance.

Monte Carlos
Christian Studer   2023-01-12 15:13
Might be due to a display driver update, not sure what else would cause this.

Did you try re-enabling the monitor via UltraMon (UltraMon menu > Display Settings) or Windows (UltraMon menu > Windows Display Properties)?

Christian Studer - www.realtimesoft.com
Monte Carlos   2023-01-13 20:31
Thank you for posting suggested fixes ... I will try them when I can ... driver updates, etc. now the PC
seems to work OK if i wait a few minutes for
Screen 1 the upper 27 incher to finally "light up'
and operate.

Two occurrences of that.

Monte Carlos
MarianoKovac   2026-02-15 14:09
It sounds like something changed recently that’s causing your upper monitor to stay dark after your PC wakes up from sleep. Since you've been using Ultramon for years without issue, it's likely related to either a recent update or a system setting.

First, try checking for any graphics driver updates, as these can often resolve monitor wake-up issues. Sometimes, Windows updates or changes in power settings can affect how external displays behave. In your case, I’d also suggest adjusting the sleep settings for your monitors or even disabling them during sleep mode, if possible.

Another thing to try is going into your device manager and disabling the monitor that's causing the issue, then re-enabling it without restarting. This might help "wake it up" without needing a full restart. If Ultramon settings got reset during a Windows update, it’s worth re-checking those, as they could be contributing to the issue.
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Lastly, you might want to try a fresh reinstall of Ultramon or updating it in case a new version has fixed a related bug. Hopefully, one of these steps will solve the problem without losing your browser tabs!
Forums -> Multiple monitors -> Top Monitor not active upon start up from prior session, restart solves

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