Problem with paraler port

I have problem with my parport.
When i rum emc i get

config string '0x378 out '
Failed to claim parallel port /dev/parport0
hal_parport: rtapi_app_main: -19


cat /proc//ioports | grep par
0378-037a : parport0

I run ubuntu 12.04 with xenomai rt
uname -r
3.2.21-xenomai+

I fixed a problem. ( at last )
dmesg output
[ 4644.623839] ppdev0: failed to register device!
[ 4719.276690] parport0: cannot grant exclusive access for device ppdev0

so i run
rmmod lp
And all is working now.

Hi

If you are running a standard install check
/etc/modules this is likely where lp is being loaded - just comment it out
and
/etc/modprobe.d/linuxcnc.conf
and uncomment
install parport_pc /bin/true
which will stop parport_pc, and with it ppdev and lp loading

regards

I believe i have the same problem.
however it is only after restarting linuxCNC that it fails to claim the parallel port.
since linux cnc has to be restarted everytime the configuration is changed, this is a bit of a problem

the fix is to restart the computer, but logging out isn't enough.

so i think i can "fix it" by running rmmod lp but i would rather not break anything.
the computer i'm speaking of isn't on the internet yet, will get back with more details.

Hi

lp, ppdev and partport_pc should not be loaded, they will claim the parport before Linuxcnc starts and it will be unable to work.

This mostly occurs where someone has loaded Linuxcnc onto a vanilla distro install, rather than installing from the Live CD.
The expectation with a vanilla install is that the user will want to print stuff, so the generic drivers are loaded.

You cannot do any harm just using rmmod, but a more elegant solution is to blacklist them or install them to null.

If you think they should be blacklisted already and don't know why they are reloading when you quit Linuxcnc, look at /lib/modules/your-kernel-version/modules.dep and you will find the dependency chain for lp, ppdev, parport_pc
Just check that there is not another driver initiating their loading

regards