Logitech Illuminated Keyboard Not Working After PC Hibernation—USB Port Issue?

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#1 21678435 02 Dec 2017 03:10

Alan Winstanley Alan Winstanley

Anonymous

Post #1
21678435 02 Dec 2017 03:10

Am I right in thinking that a USB port has to be kick-started into action with an initial high(er) load before it operates? My Logitech illuminated keyboard won't work again once my PC hibernates, I have to unplug and reconnect it. I suspected that the USB port fails to trigger into operation again when the PC resumes.
The number of times I've started typing blindly only to find the keyboard isn't connected... Others have suggested a powered USB hub might do the trick.
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#2 21678436 02 Dec 2017 04:12

PeterTraneus Anderson PeterTraneus Anderson

Anonymous

Post #2
21678436 02 Dec 2017 04:12

Was your keyboard illuminated when you "started typing blindly only to find the keyboard isn't connected"? If so, the problem isn't USB power, but rather your PC not re-scanning (or whatever the correct term is) for USB devices upon coming out of hibernation.
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#3 21678437 02 Dec 2017 04:45

Alan Winstanley Alan Winstanley

Anonymous

Post #3
21678437 02 Dec 2017 04:45

@ Peter, that's a good question -- I'll find the answer next time it stops working and report back.
#4 21678438 04 Dec 2017 15:55

Alan Winstanley Alan Winstanley

Anonymous

Post #4
21678438 04 Dec 2017 15:55

It just happened again - the (illuminated Logitech) USB keyboard isn't illuminated when the PC wakes up, I have to unconnect and reconnect it. For bus powered USB peripherals I thought the port needed to deliver up to 100mA before it finished configuring. Maybe it's a power supply issue.
#5 21678439 05 Dec 2017 07:17

PeterTraneus Anderson PeterTraneus Anderson

Anonymous

Post #5
21678439 05 Dec 2017 07:17

So the USB power to your keyboard is not coming back on when your PC comes out of hibernation. How do you trigger your PC to come out of hibernation? A USB mouse, perhaps?
For bus-powered USB, the host port on the PC can deliver up to 500 mA at 5 V, and each port on a hub can deliver up to 100 mA.
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#6 21678440 06 Dec 2017 03:44

Ian Stedman Ian Stedman

Anonymous

Post #6
21678440 06 Dec 2017 03:44

Alan,
Goto device manager, select the USB keyboard, right click and select properties. From the properties menu, look for the 'Power Management' tab. The 'Allow this device to wake computer' should be ticked. Also check the 'Allow computer to turn off this device to save power' option is unticked or as on my PC greyed out.I'm assuming you use Windows.
Ian
#7 21678441 06 Dec 2017 04:27

Alan Winstanley Alan Winstanley

Anonymous

Post #7
21678441 06 Dec 2017 04:27

Ian, thanks, I've looked at that (Windows 7) and Allow device etc is ticked and Allow computer etc is in fact greyed out like yours. Elsewhere I'm reading how some users of Logitech illuminated keyboards are having the same problem, one suggestion is to try through a powered hub, or untick Allow device to wake computer instead, which I'll do next.
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#8 21678442 22 Oct 2018 15:44

Jason Karlaile Jason Karlaile

Anonymous

Post #8
21678442 22 Oct 2018 15:44

Go to device managerSelect the USB keyboard,Right click and select propertiesFrom the properties menuLook for the Power Management tabif you are stuck and not getting any option you can also take the important instruction from the and it will be useful.The Allow this device to wake computer should be ticked. Also check the Allow computer to turn off this device to save power option is un-ticked or as on my PC grayed out.
#9 21678443 23 Oct 2018 05:16

Alan Winstanley Alan Winstanley

Anonymous

Post #9
21678443 23 Oct 2018 05:16

Thanks for that Jason, the Allow this device... was not ticked so i have now done that and will see what happens.Thanks Alan W
#10 21678444 23 Oct 2018 10:16

Jason Karlaile Jason Karlaile

Anonymous

Post #10
21678444 23 Oct 2018 10:16

https://goo.gl/RhqLGF take the instruction from the given one
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Topic summary

A Logitech illuminated USB keyboard fails to reconnect automatically after a PC resumes from hibernation, requiring manual unplugging and re-plugging. The issue may stem from the USB port not reinitializing power or failing to rescan USB devices upon wake. Bus-powered USB ports typically supply up to 500 mA at 5 V, with hubs delivering up to 100 mA per port, which may affect device power-up. Windows device manager settings under the Power Management tab are critical: enabling "Allow this device to wake the computer" and disabling or ensuring "Allow the computer to turn off this device to save power" is unticked or greyed out can influence device behavior. Some users report that connecting the keyboard through a powered USB hub can resolve the problem. The problem appears common among Logitech illuminated keyboard users, suggesting a combination of USB power management and device wake settings as the root cause.
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Logitech Illuminated Keyboard Not Working After PC Hibernation—USB Port Issue?

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Topic summary