04-16-2012 07:34 AM - edited 04-16-2012 08:21 AM
I used the "powercfg lastwake" command to find out why my media PC was waking up during the night - it told me that it was the USB port that the K400 was plugged into. It's also the only thing plugged into the PC
I tried turning the Logitech software update off, but that made no difference. I could try setting it not to wake the PC from the Windows power settings, but I WANT the keyboard to wake the PC - just not in the middle of the night!
The keyboard is turned off and tucked away in a drawer - so it's not one of the cats setting it off either
04-16-2012 04:27 PM
Here's one idea. There should be an on/off switch towards the right-front of your keyboard. Try turning the keyboard "off" after putting the computer to sleep and see if the problem still persists.
07-21-2012 07:36 PM
I have the exact same issue. It does not matter wether I turn the keyboard off or not, apparently it is the USB dongle that turns the computer on (I unplugged it and the problem was solved. Put it back with the keyboard off, still wakes the computer on). For me, I don't have to wait until midnight. When I put the computer to sleep, it remain in the sleep mode for just a second before waking up again.
I went to Device Manager and tried toggling the wakeup permission of every single device (USBs, HIDs, Mouses, Keyboards) in order to see the effect. Interesting finding: K400 adds two devices to the keyboards and two devices to the mice. In each case there is a standard HID device and a Logitech Unifying device. Toggling the power options of the Unifying devices does not help. Turning off the wakeup option of the standard HIDs associated with both keyboard and touchpad of K400 solves the problem.
Now, my issue is that I can not turn my computer on with my K400 anymore, even when I turn on the wakeup option for Unifying mouse and keyboard. Turning this option off on the aforementioned standard HIDs, apparently, completely disables the wakeup function of the device. Any idea about how I can configure K400 in a way that it turns my computer on whenever I TOUCH IT, not when it wants to?
I'am on Windows 7 - 64 bit and I have the Logitech software installed. There is no other pointing devices connected to the computer, except the laptop's internal PS/2-compatible touchpad and keyboard. I am not using a USB hub, but there are other devices connected to the other usb ports of the computer such as an external soundcard and an external cooler.