Messages in this thread | | | Date | Wed, 17 Jun 1998 09:21:55 +0200 | From | Henrik Storner <> | Subject | Re: 2.1.10[56] parallel port problems - starts with 2.1.104 |
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I wrote:
>In 2.1.105 and .106, printing is essentially broken for me. It seems >as if "flow control" does not work - the print-outs I get have missing >lines, garbled data and look just plain awful. Oddly, there seems to >be no errors, warnings or other messages logged anywhere - as far as >Linux and lpd are concerned, everything looks fine and dandy.
I've narrowed down the problem to the parport patches that went into 2.1.104. This update breaks printing on my system; using polled mode or interrupt-driven mode does not make any difference in the output.
That I can use interrupt-driven mode is actually an improvement - until now, that mode has always been 100% broken with my system. And indeed, the patch does include a note that the interrupt handling was modified to cater for a "buggy handshake" on some HP and Epson printers.
>The printer is an Epson Color Stylus II.
The parallel port is built into the motherboard, an FIC PA-2007 using the VIA VP2 chipset. The BIOS setup of the parallel port is * I/O port 0x378, IRQ 7 * EPP/SPP mode * EPP type 1.9
>The parport driver is completely modular, with options
> alias char-major-6 lp > alias parport_lowlevel parport_pc > options parport_pc io=0x378
(I tried interrupt-driven mode by adding "irq=7" to that options-line).
>Log messages when the module loads: > parport0: PC-style at 0x378 [SPP,PS2,EPP] > parport0: no IEEE-1284 device present. > lp0: using parport0 (polling).
>(the printer wasn't turned on when the modules loaded; when it is, it >correctly detects my printer).
-- Henrik Storner | "testing? What's that? If it compiles, it is good, | if it boots up it is perfect." | Linus Torvalds
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