问题
I'm using Ubuntu 16.04 and every time I run any Kivy App (I'm new to both Ubuntu and Kivy), I get the message:
[WARNING] [MTD] Unable to open device "/dev/input/event7". Please ensure you have the appropriate permissions.
It works normally, I would just like to know why the message appears and if I can get rid of it. It doesn't matter if I run the app from PyCharm or Terminal. When I run it in Windows, everything is fine without this message.
回答1:
This message appears because Kivy queries each input device to see if it should listen to it. It doesn't matter that it failed to access this one, it's normal.
It's a minor bug that this message is printed each time, since it isn't really necessary, but nobody has ever got around to fixing it.
来源：https://stackoverflow.com/questions/53874166/kivy-unable-to-open-device-dev-input-event7-on-ubuntu-no-permission