happened to me again today. The mouse cursor constantly flies to the right at a constant speed and trying to counter that movement displacing the cursor to the left is tough, makes the mouse impossible to use on the desktop, while the character in a game, i.e. Vampire Survivors, always go up. Dunno what triggers it but I found out that it's not a Steam thing 'cos Steam wasn't running.Maybe some combination of the Steam controller service and whatever controller profile it's using has the analog stick deadzone too tight (causing phantom movement)? Not sure what the trigger is for the keyboard to display. All that stuff is finely configurable in the Steam settings so you should be able to troubleshoot it.
It's just that for whatever reason, if that bug or whatever happens and Steam is running, it tends to "magically" open Steam's on-screen keyboard. I am guessing it's something with the Logitech keyboard I am using, maybe a driver thing, which is a kb with a mousepad too, but I am not sure. I fixed it buy using Restart on Windows but cancelling it when it asked me if I wanted to restart. Logging out also fixes it but it's a pita 'cos if you are playing a game you have to relaunch it.
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