That just depends on your hardware. At least on some notebooks this functionality is provided. On typical non-mobile devices its impossible.
But its pretty simple to develop a controlled hardware device that does so
(when plugged between computer and USB peripheral.
Regards,
"Jim Mcduggan" wrote:
> Is there a way to turn off power to a usb hid keyboard device thru software?
>
>
> The wmi spec says that function is not implemented in the driver.
>
>
> I don't mind if I have to reboot.
> I don't mind if I can simply turn of the power the usb chip too.
> I tried disabling every usb device and controller with devcon.exe, but that
> did not shut off power to the device or the via ohci host controller..
>
>
> Also when I shutdown the pc, the power to the hid device is still enabled.
>
>
> tx
> j
>
>
>
>
.
Re: Flames over -- Re: Which is simpler? ... to reduce power consumption, while other parts are in active use. ... typically your usb hard drive and almost allways your ide/sata/scsi ... most PC hardware keeps USB powered in suspend-to-ram states, ... using various types of wakeup event including "magic packet". ... (Linux-Kernel)
Re: Random Reset ... Notice how many USB devices "don't need power" but have a discreet ...True random resets are more usually due to power discontinuities, ... If not, start on hardware troubleshooting.... (microsoft.public.windowsxp.general)
Re: Dell E1505 freezes ... power, with a USB mouse attached (and network cable, external monitor), and come back later, sometimes it will not come back up! ... The only power saving setting I have when on AC power is to turn off the monitor. ... Dell told me to uncheck "Allow the computer to turn off this USB device to save power" in the "USB Root Hub" items in the device manager because I thought this this problem only occurs when I have a USB mouse plugged in. ... "Tom's Hardware recently discovered a bug in Microsoft's ACPI driver implementation under Windows XP SP2 that causes a loss of more than one hour of battery time when connecting any USB 2.0 device to an Intel Core Duo based system. ... (comp.sys.laptops)
Re: PINMAME HW PCB ... Don't want to steal your thunder here, but no roms, no parallel port,... and existing hardware.... No functionality yet, either. ... He's going the "USB> WPC interface ... (rec.games.pinball)
Re: [linux-usb-devel] ThinkPad T41 - Strange USB 2.0 behaviour ...USB Universal Host Controller Interface driver v3.0 ... hub 1-0:1.0: no power switching... ehci_hcd 0000:00:1d.7: GetStatus port 4 status 001803 POWER sig=j CSC CONNECT ... (Linux-Kernel)
