[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1956533
Title:
Printing anything to /dev/lp0 makes Ubuntu Server 20.04 crash
Status in linux package in Ubuntu:
Expired
Bug description:
Whenever I try to print anything to /dev/lp0 (the parallel port of my
ASUS M5A78L-M LE mainboard), my Ubuntu 20.04 server freezes completely
(display gets black, no keyboard input, no network reaction). Thereby
it doesn't matter whether I try printing a testpage in the
webinterface of CUPS (http://localhost:631), trying to print a Windows
10 test page from a SaMBa client or try entering 'echo "Test" >
/dev/lp0' on the console. When trying the latter, my HP LaserJet 6L
printer prints 'Te', so a little bit of the print job seams to come
out before the crash. In /var/log/syslog, there are no entries about
the crash (I tried waiting 5 minutes, then do the echo test, then wait
another 5 minutes before restarting to be able to isolate any possible
entries caused by the crash clearly by the time stamp, but there
aren't any).
As a workaround, I installed a DELOCK 90413 'Serial + Parallel PCI
Express x1 Card' into my server, which is recognized as /dev/lp1. When
using this parallel port, printing works perfectly.
In my old hardware with another mainboard, the same installation (I
just changed hard disks) worked perfectly with the internal /dev/lp0.
I also tried printing to the problematic parallel port on my new
server hardware (the problematic one) using FreeDOS 1.3, just to
confirm that my hardware is not defective, and it worked perfectly.
So Ubuntu 20.04 seems to have a problem with the internal parallel
port of the ASUS M5A78L-M LE mainboard. Unfortunately, I cannot tell
which package is affected as I can't find any log entries. However, I
guess, it's not cups, as a direct echo to /dev/lp0 also does not work.
So I guess, it's something deeper.
What you also need:
1) Ubuntu 20.04.3 LTS
2) I don'd know. Sorry.
3) When printing to /dev/lp0, a page should come out of the printer.
4) When printing to /dev/lp0, the whole system crashed (display black, no
reaction to anything).
If I can provide you further information to fix this bug, please don't
hesitate to contact me. However, you need to help me how to gather it,
as all my ideas are already described above.
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