?I have two USB printer connected to my server. They usually run great
but some times when we send to print on the laser the job is sent to
inkjet and versa-vice. 

If I restart the lpd server it will not fix it. However if I restart the
whole machine the print job will go to the right printer.

Makes me think it's the USB stack, not samba or LPD.

where would you start to debug that, what traces should I look for ? 

David

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