If you (or the automatic update) installs one, it is especially important to check these power management settings are still correct - sometimes they revert to the wrong settings. Things that worked fine may suddenly seem broken after a Windows Update, Upgrade, or Feature pack etc. The power plan may not save all of this, so if you suspect a problem, check the above tips again. It might make it easier to restore things in the future.
You may wish to save a new Windows Power Plan with these settings. This can give you an uncontrollable systems with random mouse clicks if it thinks your GPS or mount or some other device is a mouse.
TURN OFF USB POWER WHEN COMPUTER OFF SERIAL
Turn OFF (uncheck) the Serial Enumerator setting if this is an option - this prevents the computer from thinking a Microsoft Serial Mouse is on this port. Turn OFF (Uncheck) the USB Selective Suspend setting - this prevents unexpected powering off. Here's an example from an FTDIchip USB-to-serial adapter. USB to Serial Adapters and RS232 COM Portsĭevices such as a focuser, telescope mount, weather sensor, dew controller or power switch may be set up with an RS232 serial communication port, and your PC may use a USB-to-Serial adapter to make the connection.ĭifferent vendors have different settings. Turn power management off for each of them. Typically you will see something like PCI Express - USB Host Controller - USB root hub - USB hub - Device. But what if you do not want to turn on your laptop to. You can also View Devices by Connection, and expand it out, something like this: In such situation, you can use you laptop to charge phone or other device of course via USB data cable. You need to do this for all USB devices, USB hubs, USB root hubs, and PCIe devices. Windows Device Manager - Power ManagementĮach device in your system may have some power-saving settings.įor all devices in the hierarchy of USB hardware, you need to check that the power management settings are off.Ĭheck their properties, and the Power Management tab.ĭisable (uncheck) the option Allow the computer to turn off the device to save power.
TURN OFF USB POWER WHEN COMPUTER OFF HOW TO
Here's how to turn it off in Windows 10 version 1909: USB Selective Suspend should be turned OFF. Go into the Windows Power and Sleep settings - Advanced.įind the USB Selective Suspend option by expanding the list until you find it. Windows Power Management - USB Selective Suspend However, if Windows powers off a device or hub, this can disrupt communications between software and observing equipment. It will shut down devices to save energy. Windows Power Management may be contributing to the problem. Is your camera or other device disconnecting randomly ?ĭid it stop responding for no apparent reason?