Yesterday I installed Ubuntu 18.04 LTS as a fresh install. Everything seems to work on my Intel NUC except for double click button on my "Contour Design RollerMouse Free 2". I initially filed a bug report against the kernel [1] because I thought it was some kind of kernel regression but after further debugging today the kernel seems to behaving as expected. Instead I suspect something goes wrong from kernel input events to when XEvents are emitted, but I have no clue on where to continue my debugging.
### Expected behaviour When I click the "double click" button on my roller mouse; left button click event should be triggered twice. This is used e.g. opening a folder in Nautilus. ### What is happening now Only one click is registered so to open a folder in Nautilus I need to press the double click button twice. ### Debugging so far "xev" and "xinput test <id>" reports only one cycle of "button press, button release" when I press the double click mouse button. "evtest" reports two cycles of "button press, button release" for BTN_LEFT. See bug report for output [1]. ### Questions Somewhere between kernel button events (evtest) to XEvent (xev, xinput test) something goes wrong. 1. Which applications are inbetween that could be the culprit? 2. How do I continue narrowing down what is wrong? Any help is appreciated. [1] https://bugs.launchpad.net/ubuntu/+source/linux-signed/+bug/1767660?comments=all Best regards -- Christoffer Holmstedt
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