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Old 8th September 2009, 11:51 AM
aunola Offline
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Join Date: Sep 2009
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linuxfedorafirefox
X server fails to start on cluster node.

Hi,

I have the following problem. I'm trying to run a parallel visualization program (paraview) on a cluster. This means the program is running on all nodes on the cluster. On each node, the program attempts to connect to the local X server to do local rendering.

Now, except for my head node, none of the other cluster nodes have mouse, keyboard or monitor connected to them. This seems to have the effect, that X is never started on these nodes. As a result, when the rendering program tries to connect to it, it fails.

I include here the final section of /var/log/Xorg.0.log on my monitorless cluster nodes:


Build ID: xorg-x11-server 1.6.1.901-1.fc11
Before reporting problems, check http://wiki.x.org
to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
(++) from command line, (!!) notice, (II) informational,
(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Tue Sep 8 12:21:29 2009
(==) Using default built-in configuration (30 lines)
(EE) open /dev/fb0: No such file or directory
(EE) NOUVEAU(0): ========== misaligned reg 0x001020FB ==========
(EE) NOUVEAU(0): ========== misaligned reg 0x001020FB ==========
(EE) NOUVEAU(0): ========== unknown reg 0x0077FFF4 ==========
(EE) NOUVEAU(0): ========== unknown reg 0x0077FFF8 ==========
(EE) NOUVEAU(0): ========== unknown reg 0x0077FFFC ==========
(EE) NOUVEAU(0): Pointer to flat panel table invalid
(EE) NOUVEAU(0): 1526: No valid modes.
(EE) Screen(s) found, but none have a usable configuration.

Fatal server error:
no screens found

Not being sure how to solve this, my first guess would be that I have to make sure X is started regardless of the missing monitor etc.

How can I do that ?
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