Messages in this thread | | | Date | Mon, 20 Dec 1999 17:13:14 +0100 (CET) | From | Bernhard Rosenkraenzer <> | Subject | Some more details on parport autoprobing bug |
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The printer seems to have a problem switching to IEEE1284_DEVICEID mode shortly after initialization.
It happens in userspace, too, if the program accessing /dev/parport0 has to autoload the module.
In userspace, my workaround (ugly, but works) is replacing mode = IEEE1284_MODE_NIBBLE | IEEE1284_DEVICEID; ioctl(fd, PPNEGOT, &mode); with result = 1; mode = IEEE1284_MODE_NIBBLE | IEEE1284_DEVICEID; for(i=0; i<15 && result!=0; i++) result=ioctl(fd, PPNEGOT, &mode);
I guess the kernel autoprobing fails because of the exact same thing. errno = 5 for the first couple of ioctl()s.
LLaP bero
-- Nobody will ever need more than 640 kB RAM. -- Bill Gates, 1983 Windows 98 requires 16 MB RAM. -- Bill Gates, 1999 Nobody will ever need Windows 98. -- logical conclusion
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