Seems I am very close to resolving this bug. I've done some deep testing today under following OSes (all are in the newest version): 1) CentOS 6.3 2) Fedora 17 3) openSUSE 12.2 4) Ubuntu 12.04
Under all 4, there is the same ownership of /dev/lp0 and /dev/parport0 (owner root/group lp, permissions 660), BUT I have found the difference between Red Hat based systems (where the parallel printer works well) and the others (Ubuntu and openSUSE - where id doesn't work well). The output of "dmesg|grep parport" for Red Hat based is: [ 7.522714] parport_pc 00:06: reported by Plug and Play ACPI [ 7.522769] parport0: PC-style at 0x278 (0x678), irq 5 [PCSPP,TRISTATE] [ 45.177790] lp0: using parport0 (interrupt-driven). however Ubuntu and openSUSE dmesg "dmesg|grep parport" says this: [ 21.205326] parport_pc 00:06: reported by Plug and Play ACPI [ 21.205380] parport0: PC-style at 0x278 (0x678), irq 5, using FIFO [PCSPP,TRISTATE,COMPAT,ECP] [ 21.326415] lp0: using parport0 (interrupt-driven). So the diffrence between those two seems to be between enabling and disabling FIFO. I've also looked at kernel configure files for Fedora 17 and Ubuntu 12.04 and I am posting the important section here: Ubuntu 12.04 kernel configuration file (section PARPORT): CONFIG_PARPORT=m CONFIG_PARPORT_PC=m CONFIG_PARPORT_SERIAL=m CONFIG_PARPORT_PC_FIFO=y # CONFIG_PARPORT_PC_SUPERIO is not set CONFIG_PARPORT_PC_PCMCIA=m # CONFIG_PARPORT_GSC is not set CONFIG_PARPORT_AX88796=m CONFIG_PARPORT_1284=y CONFIG_PARPORT_NOT_PC=y Fedora 17 kernel configuration file (section PARPORT): # Parallel port support # CONFIG_PARPORT=m CONFIG_PARPORT_PC=m CONFIG_PARPORT_SERIAL=m # CONFIG_PARPORT_PC_FIFO is not set # CONFIG_PARPORT_PC_SUPERIO is not set CONFIG_PARPORT_PC_PCMCIA=m CONFIG_PARPORT_1284=y # CONFIG_PARPORT_AX88796 is not set CONFIG_ACPI_PCI_SLOT=y CONFIG_HOTPLUG_PCI_ACPI=y CONFIG_HOTPLUG_PCI_ACPI_IBM=m I am not so experienced to recompile the kernel with option CONFIG_PARPORT_PC_FIFO=n on my own so by this post I would like to please someone to do this for us. Or please post here a guide how to quickly recompile the kernel with changed parameter CONFIG_PARPORT_PC_FIFO. Many thanks to kernel team! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/339752 Title: Slow/stuttering printing through parallel port To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/339752/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
