Comment 1 for bug 348934

I've just upgraded to Jaunty 64-bit from Intrepid 64-bit and can confirm this bug. I'm running the exact same kernel version as the OP.

I use two 1920x1080 monitors run by an NVidia 8800GT gfx card using TwinView (effective screen size 3840x1080) and usually have MythTV running on the second display. Under Intrepid this worked fine. It also works under Jaunty, however there is a gap at the top of the screen showing the background wallpaper. The MythTV screen is not cropped - it is actually pushed down and starts underneath this gap.

The gap is the same size as the top Gnome panel on the first screen. If I activate AutoHide on that panel then restart MythTV-Frontend, the gap is now reduced to the small-size Gnome panel.

If I turn OFF Compiz effects, then MythTV instantly goes full-screen (without needing to restart it). If I turn Compiz effects back ON, the gap returns instantly (without needing to restart MythTV).

I'm using a patched version of MythTV with VDPAU support, however I've repeated the test using the Ubuntu-supplied version of MythTV in a separate test install and the problem is still present.

mythtv-frontend:
  Installed: 0.21.0+fixes-svn20397-openglvdpau-0ubuntu2
  Candidate: 0.21.0+fixes-svn20397-openglvdpau-0ubuntu2
  Version table:
 *** 0.21.0+fixes-svn20397-openglvdpau-0ubuntu2 0
        500 http://mirror.serenux.com jaunty/release Packages
        100 /var/lib/dpkg/status
     0.21.0+fixes-svn20320-openglvdpau-debug-0ubuntu2 0
        500 http://mirror.serenux.com jaunty/testing Packages
     0.21.0+fixes-svn20320-openglvdpau-0ubuntu2 0
        500 http://mirror.serenux.com jaunty/release Packages
     0.21.0+fixes-svn20310-openglvdpau-0ubuntu5 0
        500 http://mirror.serenux.com jaunty/release Packages
     0.21.0+fixes19961-0ubuntu8 0
        500 http://mirror.serenux.com jaunty/multiverse Packages

This gap issue was not present under Intrepid.

Attached is a screenshot illustrating the gap at the top of the Myth display. The gap shows the desktop wallpaper and is the size of the top Gnome panel on the first screen.

Cheers.