lucid problem with nvidia twinview setup?

[Charlie Zender]

Hi All,

Maybe someone will know how to get my setup working with lucid.
it was working perfectly with karmic, and the lucid upgrade proceeded
normally until the kdm login screen. kdm does start, and X sort of
works because the login prompt appears, but after accepting my
password kdm fails to start the desktop and instead goes back to
the login screen in an endless loop asking for my password.

Hardware is a Dell Precision m6400 laptop in a docking station.
Laptop is closed and two 30" Dell displayport monitors, configured as
one logical desktop with nvidia-settings into a Twinview
configuration.

Taking a shot in the dark here, but this seems to be the portion
of the X.log that records the failure.

(--) Apr 29 17:42:02 NVIDIA(1): LGD (DFP-0): 330.0 MHz maximum pixel clock
(--) Apr 29 17:42:02 NVIDIA(1): LGD (DFP-0): Internal Dual Link LVDS
(--) Apr 29 17:42:02 NVIDIA(1): DELL 3008WFP (DFP-3): 330.0 MHz maximum
pixel clock
(--) Apr 29 17:42:02 NVIDIA(1): DELL 3008WFP (DFP-3): External DisplayPort
(--) Apr 29 17:42:02 NVIDIA(1): DELL 3008WFP (DFP-4): 330.0 MHz maximum
pixel clock
(--) Apr 29 17:42:02 NVIDIA(1): DELL 3008WFP (DFP-4): External DisplayPort
(II) Apr 29 17:42:02 NVIDIA(1): Display Device found referenced in
MetaMode: DFP-0
(WW) Apr 29 17:42:02 NVIDIA(1): There are only 2 heads available,
trimming display device list
(WW) Apr 29 17:42:02 NVIDIA(1):     from "DFP-0" to "".
(II) Apr 29 17:42:02 NVIDIA(1): Assigned Display Device:
(WW) Apr 29 17:42:02 NVIDIA(1): Invalid display device in Mode Description
(WW) Apr 29 17:42:02 NVIDIA(1):     "DFP-0:nvidia-auto-select+0+0"
(WW) Apr 29 17:42:02 NVIDIA(1): Not using mode description
"DFP-0:nvidia-auto-select+0+0";
(WW) Apr 29 17:42:02 NVIDIA(1):     unable to map to display device
(==) Apr 29 17:42:02 NVIDIA(1):
(==) Apr 29 17:42:02 NVIDIA(1): No modes were requested; the default
mode "nvidia-auto-select"
(==) Apr 29 17:42:02 NVIDIA(1):     will be used as the requested mode.
(==) Apr 29 17:42:02 NVIDIA(1):
(WW) Apr 29 17:42:02 NVIDIA(1): No valid modes for "nvidia-auto-select";
removing.
(WW) Apr 29 17:42:02 NVIDIA(1):
(WW) Apr 29 17:42:02 NVIDIA(1): Unable to validate any modes; falling
back to the default mode
(WW) Apr 29 17:42:02 NVIDIA(1):     "nvidia-auto-select".
(WW) Apr 29 17:42:02 NVIDIA(1):
(WW) Apr 29 17:42:02 NVIDIA(1): No valid modes for "nvidia-auto-select";
removing.
(EE) Apr 29 17:42:02 NVIDIA(1): Unable to use default mode
"nvidia-auto-select".

Any help appreciated.

Charlie
-- 
Charlie Zender, Department of Earth System Science
University of California, Irvine (949) 891-2429 :)