SOLUTION/ WORK AROUND This problem still exists and has since about 2008 in various guises. This may just be one of them! I am using an HP 3055 MFP, networked with Fedora 17.
I am not going to post pages of output, as none of it disclosed anything unusual. I had scanned 700 pages at 1200dpi using the ADF when it all stopped. I upgraded the kernel iirc, but I may have touched other things. I did reboot. To get working again, I upgraded everything, downgraded everything, upgraded everything, installed and re-installed sane, libsane, xsane and hplip. (hplip is 3.13.4 from fedora updates.). . Kept getting the 'Error on read I/O' message, and this in the journal: scanimage[11776]: io/hpmud/jd.c 630: timeout read_channel sec=10 hp:/net/HP_LaserJet....1.12 scanimage[11776]: invalid read: exp=1509 act=269 ReadMfpdtfBlock scan/sane/mfpdtf.c 527 scanimage[11834]: io/hpmud/pp.c 627: unable to read device-id ret=-1 I tried everything. Sacrificed a chicken at the full moon. Nothing worked. Epiphany. Found an old USB cable, and reinstalled the printer as USB. DAMN! Same 'read i/O' error but now: scanimage[7220]: io/hpmud/dot4.c 121: unexpected DOT4CreditRequest: cmd=4, hid=1, pid=1, maxcredit=8 Did some *more* googling. Found a reference from 2008 where the fix to 'read I/O' error was to change from 'Lineart' to 'Gray' mode. And that works! So changing from: scanimage --device-name=$hpaio --format=tiff --mode Lineart --resolution 1200 -l 40 -t 12 -x 110 -y 210 -v --batch=$2%d.tif --batch-start=$3 --batch-count=$4 --batch-increment=$5 to: scanimage --device-name=$hpaio --format=tiff --mode Gray --resolution 1200 -l 40 -t 12 -x 110 -y 210 -v --batch=$2%d.tif --batch-start=$3 --batch-count=$4 --batch-increment=$5 corrects this problem...... $hpaio is presently: 'hpaio:/usb/HP_LaserJet_3055?serial=xxx' etc. It was hpaio:/net/HP_xxxx...' And I just finished doing 2 50 page batch scans, for 100 total without intervention except to turn the stack over. And not a single message to the journal. SOOOOOOOOO; my best guess is that there is a fixed size buffer somewhere, which is set to a different size for Lineart than for Gray and which is too small for 1200dpi. Note that I could ALWAYS scan using 600dpi. It was only 1200 dpi which failed. I did not reduce the scanned page size in order to test this. There *may* be another issue for networked scanners using the wrong uri, but the system worked up until I re-booted. I rarely reboot the desktop and it had been up for 4 months or so before I updated the kernel and rebooted. So there is a clue. It's about time to find and squash this bug. Contact me directly if you have questions. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/411181 Title: sane detects but doesn't scan with HP network scanner To manage notifications about this bug go to: https://bugs.launchpad.net/hplip/+bug/411181/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
