Hi. This bug [1] in the Valve github tracker seems to be caused by the hid-steam driver, written by me, introduced in 4.18. With this driver there is a new input device, which is disabled when the Steam client is running. That is usually harmless, but some games go nuts with that extra device. I have written a patch, that instead of disabling the device, removes it when Steam is running, and recreates it when Steam is closed. I have submitted it to LKML a few days ago [2], but it looks like it went through the cracks... It would be great is someone could check it. Thanks. [1]: https://github.com/ValveSoftware/steam-for-linux/issues/5645 [2]: https://lkml.org/lkml/2018/10/14/502