Re: lpdev v0.6

[bousch@topo.matups.fr (Thierry Bousch)]

Hello Ulrich,

> Over the weekend, I tried to get your /dev/lp driver to work on my TT
> and a hp deskjet 500. Whatever I print, the busy light on the printer
> is lighted for a short time, the printing process exits, but nothing
> else happens. When I use the /dev/centr device, the printer also
> prints. Do you have any hints for me?

I have also noticed that lpdev ceased to work after applying Kay's net
patches to the kernel. Apparently, there is interference with the PLIP
driver, which is not too surprising since each one wants to reprogram
the MFP interrupt source 0 for its own use. You could probably fix the
problem by commenting out the PLIP code (haven't tested); more simply,
just send anything to /dev/centr, after that /dev/lp should work just
fine. (I haven't an explanation for this, but I guess that PLIP fiddles
with the active edge register, and that -one- Centronics interrupt is
enough to put things back in order.)

Thierry.