Comment 40 for bug 1310489

The error that you see in the log was caused by this code:

if (is_disabled_in_cmdline()) {
    fprintf(log_handle, "Disabled by kernel parameter \"%s\"\n",
            KERN_PARAM);
    goto end;
}

That simply parses /proc/cmdline.

A few more things to try:

1) Maybe what you see is an old log. Try with:

sudo rm /var/log/gpu-manager.log

and reboot

See if you can still see the same gpu-manager.log (with the same error about the nogpumanager parameter)

2) Try starting the upstart job:

sudo rm /var/log/gpu-manager.log

sudo start gpu-manager

And see what /var/log/gpu-manager.log says

3) If 1) and 2) fail, try this:

sudo rm /var/log/gpu-manager.log

sudo gpu-manager --log /var/log/gpu-manager.log