For me the problem only appears when watching videos with the ubuntu webbrowser. With firefox videos have no offset and the controls are visible. Unity itself has no overscanning, because the indicatorpanel is visible. I have two screenshots which compare the same video on the ubuntu webbrowser and on firefox. The first one is from the ubuntu webbrowser.
** Attachment added: "screenshot20160429_192500220.png" https://bugs.launchpad.net/ubuntu/+source/webbrowser-app/+bug/1575854/+attachment/4651576/+files/screenshot20160429_192500220.png -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to webbrowser-app in Ubuntu. https://bugs.launchpad.net/bugs/1575854 Title: videos have offset when connected to an external screen Status in webbrowser-app package in Ubuntu: Confirmed Bug description: On Bq M10 with OTA 10.1: Watch a video on youtube/vimeo/dailymotion etc in fullscreen with the ubuntu webbrowser, when the M10 is connected to an external display over hdmi. On top of the video is a black bar, the controllelements at the bottom are not visible, so the whole video theems to be shifted down. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/webbrowser-app/+bug/1575854/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp