Hi All, I would like to draw on the collective knowledge of the group to help me diagnose a problem with slide shows in Impress, and then decide against which feature or software I should report the bug. The display problem seems to be getting worse with each release of Ubuntu, but does not effect all distributions equally.
System:- Lenovo G550 laptop. Intel Core2Duo. nVidia GeForce G210M graphics 16.04.2 Ubuntu Unity. Libreoffice 5.1.6.2 A few weeks ago my wife created a slide show, and set the slide transition of every slide to Smooth Fade. She had done this many times before without problems. When testing the presentation, there was a white flash at the end of each transition, sometimes full screen, other times a thick horizontal bar across the full width of the screen. I tried three different graphics drivers (nouveau, nVidia 304.135 and 340.102) but it had no effect. I then booted the machine into 14.04 Unity from a live DVD (LO 4.2.3.3) and the presentation worked perfectly. Next I tried 17.04 Unity from live USB, and things got even worse: the fade transition didn't work at all, it displayed a blocky, patchy, mixed up mess of a screen as if Impress was trying to display several different types of transition at the same time. Libreoffice then crashed after only the first two slides. This behaviour is repeatable. In order to try and understand what is causing this problem I tested several different releases and distributions of Ubuntu. I tried each in three different ways: with the presentation only on the laptop screen; using my TV to simulate the second screen/projector; and then with the Presenter Console disabled within Impress settings. The results are shown below:- Laptop TV No Presenter Console Unity 14.04 no flash no flash no flash LO 4.2.3.3 Unity 15.04 no flash flash no flash LO 4.4 Unity 16.04 flash flash flash LO 5.1.6.2 Unity 17.04 bad fade bad fade bad fade LO 5.3.1.2 LO crash LO crash LO crash Mint 18.1 Cinnamon no flash flash no flash LO 5.1.6.2 Kubuntu 16.04 no flash no flash no flash LO 5.1.6.2 Kubuntu 17.04 no flash no flash no flash LO 5.3.1.2 Mate 17.04 bad fade bad fade bad fade LO 5.3.1.2 LO crash LO crash LO crash Gnome 16.04 flash flash no flash LO 5.1.6.2 Gnome 17.04 bad fade no second screen display LO 5.3.1.2 LO crash You will notice two things from the above table: Kubuntu was unaffected with the presentation worked perfectly under all conditions; and secondly that Ubuntu Gnome was the worst performing of all the set ups: The laptop screen (primary screen) went blank when I connected the second screen, and as that screen had all the task bar, icons etc it made the machine unusable so I had no alternative but to shut it down using the power button. I have also tried most of the above on a Dell Studio 15 laptop (Intel Core2Due, ATI Mobility Radeon HD4530/4570/545v) with very similar results, except that the second screen worked under Gnome 17.04 but gave the bad fade+LO crash result. I have also tried a HP desktop (Intel Core2Duo, Intel G33 x86 graphics) which worked perfectly under all set ups, but without the second screen option (obviously). It does not seem to be a Libreoffice bug as it sometimes works and sometimes doesn't. It may have something to do with Gnome desktop as it seems to affect only Gnome based distros. I would, therefore, like to ask the group if they could suggest what is causing the problem, and how I should report the bug. I have found bug 78703 but its description isn't exactly the same. Yours in hope, Barry T -- ubuntu-uk@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk https://wiki.ubuntu.com/UKTeam/