I just got an ASUS EAH4650 1GB PCI-Express graphics card for my Ubuntu PC. It has a Radeon 4650 chip and 1GB of graphics RAM.
After installing the card, everything worked fine. I could use the default community drivers or the proprietary ATI/AMD drivers - both worked fine.
My problem is this: after I tried to enable Compiz desktop effects in the Ubuntu 'Appearance' control panel item, I now cannot watch any videos in any application.
When I try to play a video, all I get is a black screen where the video should be. The rest of the UI is intact, but the video isn't there. This is the case both in VLC and Totem (and other gStreamer-based apps). I can hear the sound, and codecs aren't an issue as I've been able to play the movies before with exactly the same software. Also, in Nautilus I can see that the movies have preview icons which have stills of the video, so obviously the OS is able to read the movies but not display them somehow. I have tried a wide variety of file types, including MKVs with MPEG-4 H.264 video tracks, AVIs with DivX tracks, QuickTime and many others.
A screenshot of what happens is here:
You can see in the background of that picture that the movie has a video preview in its icon in Nautilus, but that the video track does not show in Totem.
I have turned Compiz off (by setting the Visual Effects level to 'none'), but it hasn't made any difference.
I have also tried reverting to the community ATI drivers, and restarting my machine. I have tried various combinations of Compiz levels plus drivers, none of which have made a difference:
ATI drivers installed using Ubuntu 'hardware drivers' CP + 'none' compiz setting
ATI drivers installed using Ubuntu 'hardware drivers' CP + 'normal' compiz setting
ATI drivers installed using Ubuntu 'hardware drivers' CP + 'extra' compiz setting
Open source drivers + 'none' compiz setting
Open source drivers + 'normal' compiz setting
Open source drivers + 'extra' compiz setting
ATI drivers installed manually from ATI web site + 'none' compiz setting
ATI drivers installed manually from ATI web site + 'normal' compiz setting
ATI drivers installed manually from ATI web site + 'extra' compiz setting
It seems I need a way to reset X and my video driver setup to their defaults so that I can undo whatever I did wrong by enabling Compiz. I would also like to know why this problem occurred, as it's very strange.
I'm running a clean install of Ubuntu 9.10 (32-bit), and I have an Asus P5KPL-VM motherboard and an Intel Core 2 Duo 2.0Ghz E4500 processor.
The ATI driver version I downloaded from the ATI web site to test if a manual install would improve things is 8.68.2. I don't know the version number that the Ubuntu Hardware Drivers control panel installed for me.
Thanks in advance for any advice.