[mythtv-users] Violet screen on LiveTV

[shacky]

Hi.

I installed MythTV 0.21 on my laptop running a Nvidia GeForce 6150 Go
VGA card on Ubuntu
Gutsy 7.10. The official Nvidia drivers are installed and the video
functions of the laptop are running very well on all programs.
When I run mythfrontend the starting channel is correctly tuned.
I hear the audio very well, but I don't see the video. I only see a
violet screen, this is the screenshot:

http://img370.imageshack.us/img370/1435/imag0020nj6.jpg

How can I solve this problem?

Thank you very much for your help!
Bye.