F24 CUPS : all errors go to syslog

[sean darcy]

I'm trying to add a printer to headless server. I've edited cupsd.conf 
so I can log on remotely. I've set up the printer on cups, but on 
printing a test page I get "filter failed"'

I've set LogLevel to debug and restarted. No output to error_log.

MaxLogSize 0
LogLevel debug
# Allow remote access
Port 631
Listen /var/run/cups/cups.sock

Instead of error_log CUPS sends it all to syslog . I've googled. but I 
can't see when to change that to /var/log/cups/error_log.

thanks,
sean