RE: [Hpoj-devel] newbie question

[PASCHAL,DAVID (HP-Roseville,ex1) <dav...@hp...>]

> > cat /proc/parport/0/autoprobe
> 
> MODEL:Unknown device;
> MANUFACTURER:Unknown vendor;
> 
> ... which seems obviously wrong but I don't know what valid values
> might be...
It should report something like "Hewlett-Packard" (possibly all uppercased)
and "OfficeJet Series 700" for the manufacturer and model fields.

> > see what other port numbers (1, 2, etc.) are in the parport
> directory
> 
> there is only 0
OK, so we know there's really only one port.

> > Are you able to print just by dumping text or PCL
> > data to /dev/lp0 (or lp1, etc.), without loading ieee12844pp.o?
> 
> yes.  I did "cat .kshrc > /dev/lp0" and it printed it.  funky, but it
> printed.
By "funky", do mean that it exhibited the "staircase" effect?  That's to be
expected unless the Unix-style newlines (LF only) are converted to DOS-style
(CR and LF).

> > cat /proc/ioports
> 
> 0000-001f : dma1
> 0020-003f : pic1
> 0040-005f : timer
> 0060-006f : keyboard
> 0070-007f : rtc
> 0080-008f : dma page reg
> 00a0-00bf : pic2
> 00c0-00df : dma2
> 00f0-00ff : fpu
> 0170-0177 : ide1
> 01f0-01f7 : ide0
> 0220-022f : soundblaster
> 02e8-02ef : serial(auto)
> 0330-0333 : MPU-401 UART
> 0376-0376 : ide1
> 03c0-03df : vga+
> 03f6-03f6 : ide0
> 03f8-03ff : serial(auto)
> e800-e8ff : eth0
> ec00-ecff : eth1
> ffa0-ffa7 : ide0
> ffa8-ffaf : ide1
Strange.  Did you do this while the parport, parport_pc, and parport_probe
modules were loaded?  I would have expected to see lines like:
	0378-037a : parport0
	0778-077a : parport0

I'm really starting to run out of ideas here.  Your peripheral is connected
directly to the parallel port without any pass-through devices, which is
good, and the parallel port is enabled in the BIOS, obviously since you can
print by cating stuff to /dev/lp0.  The only thing I can think of is that
maybe you have a bad parallel port or cable.  Perhaps there's a line that's
stuck low or high, such that it permits the basic signaling that happens
when using /dev/lp0 but breaks the extra signaling that happens with
ieee12844pp.o.  You wouldn't happen to have a logic analyzer and DB25
breakout board handy, would you?  :-)  At the very least, I would suggest
trying a different parallel cable (a high-quality cable that is "IEEE1284
compliant").  If possible, you could also try a different printer on your PC
or try your printer in a different PC (running Linux, so you can run the
same tests).  Or you could even try adding a second parallel port, but that
could open another can of worms.

What brand/model of computer are you using?

I was going to ask if you were running VMWare (which tends to take over the
parallel port), but I didn't see anything related to it in your lsmod
output.

David