[Linux-parport] Data integrity error in parport_pc

[Matwey V. Kornilov]

Unfortunately, I don't remember whether it possible to control output
mode via /dev/lp0 device? I mean PC/EPP/ECP...


28.01.2017 15:11, Martin Schreiber пишет:
> Hi,
> I try to connect a HP Laserjet 6P with Centronics connection to an Acer Veriton M4640G on openSUSE Leap 42.2. The parallel port is provided by a
> "
> MosChip Semiconductor Technology Ltd. PCI 9815 Multi-I/O Controller (rev 01)
>         Subsystem: LSI Logic / Symbios Logic 2P0S (2 port parallel adaptor)
>         Flags: medium devsel, IRQ 18
>         I/O ports at d050 [size=8]
>         I/O ports at d040 [size=8]
>         I/O ports at d030 [size=8]
>         I/O ports at d020 [size=8]
>         I/O ports at d010 [size=8]
>         I/O ports at d000 [size=16]
>         Kernel driver in use: parport_pc
>         Kernel modules: parport_pc
> "
> PCI card.
> Yast correctly finds and initializes the printer, printing of some characters works, longer texts or graphics print garbage.
> dmesg|grep parport reports:
> "
> [   11.009445] parport_pc 00:03: reported by Plug and Play ACPI
> [   11.009591] parport0: PC-style at 0x378, irq 7 [PCSPP,TRISTATE]
> [   11.105914] parport1: PC-style at 0xd050 (0xd040), irq 18, using FIFO [PCSPP,TRISTATE,COMPAT,EPP,ECP]
> [   11.201051] parport2: PC-style at 0xd030 (0xd020), irq 18, using FIFO [PCSPP,TRISTATE,COMPAT,EPP,ECP]
> [   11.210164] parport2: Printer, Hewlett-Packard HP LaserJet 6P
> [  108.878333] lp0: using parport0 (interrupt-driven).
> [  108.878626] lp1: using parport1 (interrupt-driven).
> [  108.878727] lp2: using parport2 (interrupt-driven).
> "
> parport0 is the port on the motherboard, there printing is OK.
> parport1 and parport2 are on the PCI-card and print garbage.
> 
> With
> "
> options parport_pc io=0x378,0xd050,0xd030 dma=none,none,none irq=7,18,10
> "
> in /etc/modprobe.d/99-local.conf dmesg|grep parport reports:
> "
> [   10.632507] parport0: PC-style at 0x378, irq 7 [PCSPP,TRISTATE]
> [   10.728031] parport1: PC-style at 0xd050, irq 18 [PCSPP,TRISTATE,EPP]
> [   10.823903] parport2: PC-style at 0xd030, irq 10 [PCSPP,TRISTATE,EPP]
> [   10.843560] parport2: Printer, Hewlett-Packard HP LaserJet 6P
> [   52.490145] lp0: using parport0 (interrupt-driven).
> [   52.490228] lp1: using parport1 (interrupt-driven).
> [   52.490294] lp2: using parport2 (interrupt-driven).
> "
> and printing works on all 3 ports.
> 
> Bug reports are here:
> https://bugzilla.kernel.org/show_bug.cgi?id=190541
> https://bugzilla.opensuse.org/show_bug.cgi?id=1016204
> https://bugzilla.opensuse.org/show_bug.cgi?id=1022122
> A thread about the experiments:
> https://forums.opensuse.org/showthread.php/521726-Parallelport-support-broken?p=2804416#post2804416
> 
> Thanks, Martin 
>