Comment 215 for bug 301958

Hello everyone,
I have installed the video sis 771/671 drivers provided by Mr. Oliveira in an ubuntu 12.04 and worked perfectly from the beginning and the screen resolution is right at 1280x800, so thanks a lot; but later on I have found that when trying to play a video with Totem the screen turns into black and then returns to the login screen. When I try to play it with vlc, the video plays quite well unless I don't try to modify vlc window's dimensions or clicking on it so it understands to get to full screen, in that case everything crashes and I get the login screen again, just as with Totem. (Sometimes vlc shows a message that says that the video will be played at a very large resolution, but if you click Ok it shows in rather small window.)

Is there anything to do to solve this problem or just it's the most it can be achieved with a sis 771/671 in ubuntu 12.04?
Thanks for your attention,
David