I've been using BT4r2 ever since it was released and now I have run into a really annoying problem. I upgraded to BT5 and now startx no longer works out of the box and gives me these errors

[drm] failed to open devices
VESA(0): no valid modes
Screens found but, no usable configuration.
I can't figure out what package fixvesa (or fix-vesa, people say it is either) is from (as it is not a program listed on this computer), starting there would probably be the best bet.

I am running a P4 laptop with an integrated graphics card. It is a Dell Inspiron 5160.