XDEBUG_PROFILE will not start profiler

[bauhsoj]

I cannot get XDEBUG_PROFILE=1 to trigger the profiler when I use it in a URL. It never generates the cachegrind output. I have tried this on Linux running Apache 2.2.11 and PHP 5.2.8 with Xdebug 2.0.4, and neither obeys the XDEBUG_PROFILE argument. It works on my Windows XP test server but not on our main live server.

Here is my configuration in php.ini:

zend_extension=/usr/lib/php/extensions/no-debug-non-zts-20060613/xdebug.so
xdebug.profiler_enable = 0
xdebug.profiler_append = 1
xdebug.profiler_enable_trigger = 1
xdebug.profiler_output_dir = "/tmp/xdebug_profiler_output/"
xdebug.profiler_output_name = "cachegrind.out.%s" 

I have run phpinfo() to be certain Xdebug is configured and running. I have tried getting rid of any .htaccess rewrites, just using the standard URL, but doesn't help either. Permissions on the dir are 777.

Any idea what I am doing wrong?

[bauhsoj]

Correction, although phpinfo() shows it as loaded, Xdebug does not work at all.