Hello David, Very many thanks for the explanation!
If I remember correctly, you already explained the MLC/ECP stuff some time ago but I didn't remember the details and probably some time later I may have forgotten it again ;-) Therefore I suggest to make the explanation public available at http://hplip.sourceforge.net/tech_docs/index.html On Apr 16 17:23 Suffield, David wrote (shortened): > For the OfficeJet Pro 1150C, HPLIP will print over the parallel port > using "compatibility mode". This is the default IEEE 1284 mode. This is > why printing normally works. > > Scanning requires MLC transport support. MLC is a multi-channel > transport protocol and for parallel ports MLC will only run over IEEE > 1284 ECP mode. HPLIP only supports Software ECP mode, the lowest common > denominator. HPLIP does not use hardware ECP. This means parport DMA and > interrupts are not used by HPLIP. Do you know which parport settings in the BIOS are usually required to get support for the software ECP mode? Is "ECP" in the BIOS required for software ECP or does "ECP" in the BIOS usually mean "hardware ECP"? Is it possible that software ECP mode works even if in the BIOS "EPP", "Bi-directional", "Normal", "SPP", "Output-Only" is set? According to my limited experience "ECP" or "EPP+ECP" in the BIOS does often automatically enable DMA and/or IRQ (i.e. often one cannot select only "ECP" in the BIOS but without DMA and/or IRQ). > Based on your syslog output ppdev/parport is not allowing HPLIP to set > Software ECP mode and that is why your scan job fails. > > Now if your ppdev/parport kernel modules are loaded correctly, I don't > know why Software ECP mode is not available. This may be a kernel or > BIOS issue. Kind Regards Johannes Meixner -- SUSE LINUX Products GmbH, Maxfeldstrasse 5, 90409 Nuernberg, Germany AG Nuernberg, HRB 16746, GF: Markus Rex ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ HPLIP-Help mailing list HPLIP-Help@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/hplip-help
