For some reason, my Ogre application was failing with:
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NVIDIA: could not open the device file /dev/nvidiactl (Permission denied).However, until I found this (several weeks), Ogre was working fine, except for some very odd errors, with anything involving manualobjects or hardware buffers. There was nothing in the Ogre log; this error was in stdout or stderr.
It would be nice if Ogre somehow would check for this (whatever it is) and issue a warning in the logs.