After a 3 day struggle to get the GPU working correctly I attached to GPU Grid and now all WU error out.

This is the Machine

BOINC version 6.6.37
have tried 6.6.20, 6.4.5 same results

Nvidia Drivers: 180.11 (Ubuntu recommended)
stable and reload on reboot

have tried 185 drivers but drivers disappear on reboot and reverts to Xorg 1024 x 768




All WU error out with this or similar message"

<core_client_version>6.6.37</core_client_version>
<![CDATA[
<message>
process exited with code 1 (0x1, -255)
</message>
<stderr_txt>
# Using CUDA device 0
# Device 0: "GeForce 9800 GTX+"
# Clock rate: 1836000 kilohertz
# Total amount of global memory: 536150016 bytes
# Number of multiprocessors: 16
# Number of cores: 128
# Amber: readparm : Reading parm file parameters
# PARM file in AMBER 7 format
# Encounter 10-12 H-bond term
WARNING: parameters.cu, line 568: Found zero 10-12 H-bond term.
WARNING: parameters.cu, line 568: Found zero 10-12 H-bond term.
Cuda error in file '../cuda/cutil.h' in line 964 : initialization error.

</stderr_txt>
]]>

Did you do a manual install of the 185 drivers? Which Ubuntu distro are you using? Installing 185 drivers on Ubuntu 9.04 there is a problem of how the xorg.conf is created by the drivers. Basically it fails to load and the xorg safe mode kicks in and replaces the xorg.conf file. If can give details of your xorg.conf file I can suggest to fix it so the drivers will work.