I can confirm the problem on two different machines with up to date hardy beta and no foreign software
using kdm and nvidia cards
when a user logs out, kdm tries to start a new xserver, and that one crashes. restarting kdm produces a new working xserver
the nvidia cards are: nVidia Corporation NV17 [GeForce4 MX 440-SE] nVidia Corporation NV34 [GeForce FX 5500] (rev a1)
I can confirm the problem on two different machines with up to date hardy beta and no foreign software
using kdm and nvidia cards
when a user logs out, kdm tries to start a new xserver, and that one crashes. restarting kdm produces a new working xserver
the nvidia cards are:
nVidia Corporation NV17 [GeForce4 MX 440-SE]
nVidia Corporation NV34 [GeForce FX 5500] (rev a1)