问题
I am trying to run Yocto Image in qemu on my Ubuntu laptop with the following command.
qemu-system-arm -M overo -m 256 -sd ./test.img -clock unix -serial stdio -device usb-mouse -device usb-kbd
Qemu works fine and the image is booted pretty clean, but I am unable to use my keyboard and Mouse. On any key press I get this warning.
usb-kbd: warning: key event queue full
Any workaround for this unresponsive keyboard?
回答1:
The problem was, I need to specify USB bus number with device number for USB Pass-Through.
Get the list of USB's by this command lsusb and it will list them as following:
My keyboard bus number is 002 and address is 001. So, change the command based on the device number and address. So, my command will be as follows:
qemu-system-arm -M overo -m 256 -sd ./test.img -clock unix -serial stdio -usb -device usb-host,hostbus=2,hostaddr=1
You need to add this line -usb -device usb-host,hostbus=2,hostaddr=1 based on the device number and address. To get cursor pointer working add -show-cursor as specified by here
回答2:
Add -show-cursor argument to your command.
i.e qemu-system-arm -M overo -m 256 -sd ./test.img -clock unix -serial stdio -device usb-mouse -device usb-kbd -show-cursor
That will emulate your cursor pointer
回答3:
I had the same problem, installing os x 10.0 and the keyboard stopped working, on installing os x 10.1 no mouse even, but after removing the following entries I got it to work (OS X gave me a hint saying USB error at start up in verbose mode)
-device usb-mouse -device usb-kbd
来源：https://stackoverflow.com/questions/19665412/mouse-and-keyboard-not-working-in-qemu-emulator