The issue is still happening when the laptop stays in standby for several hours! This time I found something in the /var/crash directory: the new bug ID is #1788512, I'm not sure if it's related to this bug.
Please help to find the root cause and some workaround while it get fixed. Than you ** Changed in: xorg-server (Ubuntu) Status: Incomplete => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1780677 Title: X session crash after resuming from suspend To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1780677/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs