Hi, A Linux-user finally found a solution to my problem. It was due to my ASUS motherboard.
By editing the following file : /usr/share/X11/xorg.conf.d/10-quirks.conf Adding the following code : Section "InputClass" Identifier "Spooky Ghosts" MatchProduct "Video Bus" Option "Ignore" "on" EndSection ... the problem disappears after a reboot. It may be necessary to repeat the handling after some hard updates or OS-reinstallation. Thanks to all ! ** Changed in: linux (Ubuntu) Status: Expired => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1655085 Title: bugs linux 64bits and intel hd graphics card 4600 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1655085/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs