Currently known (or at least suspected) bugs in parport:
  
  o lp doesn't allow you to read status while printing is in progress (is
    this still true?).
  
  o parport_pc_ecp_read_block_pio() is broken.  parport will revert to the
    software-driven mode in ieee1284_ops.c
  
  See <URL:http://people.redhat.com/twaugh/parport/>.