Linux - How can I increase the amount of data printed in the X log file?
By default, the NVIDIA X driver prints relatively few messages to
stderr and the X log file. If you need to troubleshoot, then it may
be helpful to enable more verbose output by using the X command line
options "-verbose" and "-logverbose" which can be used to set the
verbosity level for the stderr and log file messages, respectively.
The NVIDIA X driver will output more messages when the verbosity
level is at or above 5 (X defaults to verbosity level 1 for stderr
and level 3 for the log file). So, to enable verbose messaging from
the NVIDIA X driver to both the log file and stderr, you could start
X by doing the following: 'startx -- -verbose 5 -logverbose 5'.