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