I now come to suspect the problem is caused by the Intel's new graphics processors,which I got the same model as that of Mart, "Intel HD Graphics 520" (Intel Core m3-6Y30 CPU). This hardware rolled out on 2015 August.
I have tried vlc on 14.04 and 15.10 on this laptop, and both shows the bug. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1537053 Title: vlc screen always on top, buggly. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/vlc/+bug/1537053/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs