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    Command:

    tunelp

    
    
    

    SYNOPSIS

           tunelp device [-i IRQ] [-t TIME] [-c CHARS] [-w WAIT] [-a {on|off}] [-o
           {on|off}] [-C {on|off}] [-r] [-s] [-q {on|off}] [-T {on|off}]
    
    
    

    DESCRIPTION

           tunelp sets several parameters for the  /dev/lp?  devices,  for  better
           performance  (or for any performance at all, if your printer won't work
           without it...)  Without parameters, it  tells  whether  the  device  is
           using  interrupts,  and if so, which one.  With parameters, it sets the
           device characteristics accordingly.  The parameters are as follows:
    
           -i IRQ specifies the IRQ to use for the parallel port in question.   If
                  this is set to something non-zero, -t and -c have no effect.  If
                  your port does not use interrupts, this option will make  print-
                  ing stop.  The command tunelp -i 0 restores non-interrupt driven
                  (polling) action, and your printer should work again.   If  your
                  parallel port does support interrupts, interrupt-driven printing
                  should be somewhat faster and efficient, and  will  probably  be
                  desirable.
    
                  NOTE:  This  option  will  have no effect with kernel 2.1.131 or
                  later since the irq is handled by the parport  driver.  You  can
                  change  the  parport  irq  for  example via /proc/parport/*/irq.
                  Read /usr/src/linux/Documentation/parport.txt for  more  details
                  on parport.
    
           -t TIME
                  is  the  amount  of time in jiffies that the driver waits if the
                  printer doesn't take a character for the number  of  tries  dic-
                  tated  by  the  -c  parameter.  10 is the default value.  If you
                  want fastest possible printing,  and  don't  care  about  system
                  load,  you  may  set this to 0.  If you don't care how fast your
                  printer goes, or are printing text on  a  slow  printer  with  a
                  buffer,  then  500 (5 seconds) should be fine, and will give you
                  very low system load.  This value generally should be lower  for
                  printing  graphics  than  text, by a factor of approximately 10,
                  for best performance.
    
           -c CHARS
                  is the number of times to try  to  output  a  character  to  the
                  printer  before sleeping for -t TIME.  It is the number of times
                  around a loop that tries to send a  character  to  the  printer.
                  120  appears  to  be  a  good value for most printers in polling
                  mode.  1000 is the default, because there are some printers that
                  become  jerky  otherwise, but you must set this to '1' to handle
                  the maximal CPU efficiency if you are using interrupts.  If  you
                  have  a  very  fast printer, a value of 10 might make more sense
                  even if in polling mode.  If you have a really old printer,  you
                  can increase this further.
    
           -a {on|off}
                  This is whether to abort on printer error - the default  is  not
                  to.   If  you are sitting at your computer, you probably want to
                  be able to see an error and fix it, and have the printer  go  on
                  printing.   On  the  other hand, if you aren't, you might rather
                  that your printer spooler find out that the printer isn't ready,
                  quit trying, and send you mail about it.  The choice is yours.
    
           -o {on|off}
                  This option is much like -a.  It makes any open() of this device
                  check to see that the device is on-line and  not  reporting  any
                  out  of  paper or other errors.  This is the correct setting for
                  most versions of lpd.
    
           -C {on|off}
                  This option adds extra ("careful") error  checking.   When  this
                  option is on, the printer driver will ensure that the printer is
                  on-line and not reporting any  out  of  paper  or  other  errors
                  before  sending  data.  This is particularly useful for printers
                  that normally appear to accept data when turned off.
    
                  NOTE: This option  is  obsolete  because  it's  the  default  in
                  2.1.131 kernel or later.
    
           -s     This  option returns the current printer status, both as a deci-
                  mal number from 0..255, and as a list  of  active  flags.   When
                  this option is specified, -q off, turning off the display of the
                  current IRQ, is implied.
    
           -T {on|off}
                  This option is obsolete. It was  added  in  Linux  2.1.131,  and
                  removed  again  in Linux 2.3.10. The below is for these old ker-
                  nels only.
    
                  This option tells the lp driver to trust or not the  IRQ.   This
                  option  makes  sense  only  if you are using interrupts.  If you
                  tell the lp driver to trust the irq, then, when  the  lp  driver
                  will  get an irq, it will send the next pending character to the
                  printer unconditionally, even if the printer still claims to  be
                  BUSY.   This  is  the only way to sleep on interrupt (and so the
                  handle the irq printing efficiently) at least  on  Epson  Stylus
                  Color  Printers.   The  lp  driver  automagically detects if you
                  could get improved performance by setting this flag, and in such
                  case it will warn you with a kernel message.
    
                  NOTE:  Trusting  the  irq is reported to corrupt the printing on
                  some hardware, you must try to know if your printer will work or
    
           -o, -C, and -s all require a Linux kernel version of 1.1.76 or later.
    
           -C requires a Linux version prior to 2.1.131.
    
           -T requires a Linux version of 2.1.131 or later.
    
    
    

    BUGS

           By  some  unfortunate  coincidence the ioctl LPSTRICT of 2.0.36 has the
           same number as the ioctl LPTRUSTIRQ introduced in 2.1.131. So,  use  of
           the  -T option on a 2.0.36 kernel with an tunelp compiled under 2.1.131
           or later may have unexpected effects.
    
    
    

    FILES

           /dev/lp?
           /proc/parport/*/*
    
    
    

    AVAILABILITY

           The tunelp  command is part of the util-linux-ng package and is  avail-
           able from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.
    
    
    

    tunelp 7 May 1999 tunelp(8)

    
    
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