Comment 4 for bug 528926

@Goh: no, I did'nt install plymouth

@Stèphane: I don't know, but my guess is no. My procedure simply reset KDM configuration to the default, this let me point my finger to KDM rc files, there is probably something wrong when you don't do a clean exit from KDE that messes up the config files.
BTW I did not experience the problem again after the "cure"

Of course this is just an hypothesis.

I would exclude that the graphic card is involved: I have an Intel G45 on a Dell latitude 4300.