[tpm] DVD playback problem

[arocker at Vex.Net]

Ever since I installed Mandriva 2010 on my laptop, I've had a problem
playing DVDs. The frame rate was approximately twice normal rate which
looked like the Keystone Kops on speed.

Acting on a suggestion I found online, I removed an entry "vga=788" from a
line in Xorg.0.log.

This had the effect of displaying the video in synch with the audio, but
as a series of static shots jerking from one image to another. (As though
the intermediate frames were missing.)

Can anybody explain what's going on here, and/or suggest the next experiment?