2022/03/01 ｜By G Editor
After waking up laptop from hibernate or sleep mode, the second monitor connected with the laptop can't display anything, can't be turned on, or can't work its touch function? You wonder if the monitor malfunctions?! Wait! This situation might be caused by the default power management settings on Windows 10/11. Please check if you use the monitor as below:
1. Connect to the USB port on laptop to supply power to the monitor
2. Connect to the USB-C port of the monitor to input video signals
3. Connect to the USB port of the monitor to transmit the touch signal
All the above are outputting power or signals through the USB port of the computer. You may find that restarting the computer makes the external monitor recovered. That is because the laptop restores to supply power to its USB devices again after it is restarted.
Don't wanna be bothered by restarting the laptop again and again? Try the steps below to check if your USB device was turned off in hibernate mode. To fundamentally fix this problem, follow the steps to disable USB power management.
1. Enter Control Panel
2. Click Hardware and Sound
3. Open Device Manager
4. Unfold [Universal Serial Bus controllers] and double click to open "Properties" window. Or you can unplug the USB cables of the monitor for confirmation. The disappeared item is that port connected with the monitor.
As shown in the fig., only when the computer connects to a touch monitor, the will show. It means that USB port connected to the touch monitor is related to this item.
5. Click [Power Management] and disable [Allow the computer to turn off this device to save power]. Click [OK] to save.
6.Double clickand then repeat Step 5 for each USB Root Hub in the list. (If the power supply or touch signals to the monitor comes from the computer's USB -A port, the power and signal are managed by the USB Root Hub. There might be a number of USB Root Hub and USB Root Hub(USB3.0) on your computer, we suggest you disable the power management on all of them. )
When your computer enters hibernate or sleep mode, it helps save the power and consumes little power continuously. Thus, the computer will cut off outputting power and signals to stop the external device under the settings of "allow the computer to turn off this device to save power". When you wake up the computer, the signals of the USB device haven't been recovered yet, preventing the external monitor from displaying or working the touch function.
|Operation Mode||Off Mode||Standby Mode|
Only shut down the power of the screen, hard disk, etc.
|Power Consumption||consume less power than sleep mode||consume very little power|
|Data Storage||Saves all operational data to the hard disk.||All operational data is held in the RAM and place the RAM to a minimum power state.|
|To Wake Up||Press Power Key||Press Any Key|