Red Hat Bugzilla – Bug 251272
udev 113-8 breaks lp0 printing
Last modified: 2007-11-30 17:12:12 EST
Description of problem:
Sudden loss of ability to print from parallel port.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Attempt to print using previously configured printer from lp0 does not work
2. Attempt to set up new lp0 printer fails - cups finds no device
Job is created, no output
USB printer would still print
This all happened abruptly after update on evening of Aug 6th -- earlier in the
day printing was fine. That evening udev was updated (cups had been updated last
I 'downdated' cups to original version, still no printing.
Subsequent downdating of udev to 106-4 resulted is resumption of lp0 printing.
bad news :-( the udev update was supposed to fix several USB problems..
can you please attach the output of:
$ tree /dev
with both versions of udev? I know, it's a bit of work, but every fedora user
will benefit from it.
*** Bug 251212 has been marked as a duplicate of this bug. ***
*** Bug 251211 has been marked as a duplicate of this bug. ***
Created attachment 160890 [details]
output from "tree /dev" with udev-106-4.1.fc7.i386 installed
Created attachment 160891 [details]
output from "tree /dev" with udev-113-8.fc7.i386 installed
# cat >/etc/udev/makedev.d/60-lp-quickfix.nodes <<EOF
There appears to be two updates that together stop printing if your using a
parallel port printer. I found my printer a Brother HL-1440 could no longer be
used. And I discovered that the GUI Printer setup and the Cups device at
http://localhost:631/ will not set up a parallel port printer that works.
I replaced both udev and cups which were updated on my computer with the
original versions from the f7 dvd. This fixed the problem and now I find lp0 as
a choice on both devices to set up a printer. I can not tell if it was the cups
or the udev update that stopped my printing.
It looks like this is because of a change in
/etc/sysconfig/modules/udev-stw.modules that is no longer calling for the
parport and lp modules to be loaded.
On my box at least, parport and parport_pc are automatically loaded but lp is
not. After loading the lp module, /dev/lp0 was created and I was able to print.
I've just recapitulated the problem.
Updated cups to 1.2.12-1 and udev to 113-8.
service restart cups (without reboot) and printing to lp0 still works.
Reboot - no printing
Go back to udev 106-4, reboot.
Printing works again.
Therefore, it's pretty clear that it's udev and not cups.
I've also created .txt files from 'tree /dev' for each version
will also add output from:
diff -u udev-106-4.txt udev-113-8.txt > diff_udevs106-113
Created attachment 160903 [details]
output of diff -u for tree /dev for each udev version
Created attachment 160904 [details]
name change to reflect plain text type
no more diffs please.. erratum is in the queue..
it's only lp* which is missing in /etc/udev/makedev.d/50-udev.nodes
udev-113-9.fc7 has been pushed to the Fedora 7 stable repository. If problems still persist, please make note of it in this bug report.