<!DOCTYPE html><html><head><title></title><style type="text/css">p.MsoNormal,p.MsoNoSpacing{margin:0}</style></head><body><div>Plot thickens. Sigh :-(<br></div><div><br></div><div>I tried<br></div><div>% sudo dnf install ipp-usb<br></div><div>% sudo systemctl {enable,start,status} ipp-usb<br></div><div>which showed that ipp-usb.service was running<br></div><div>% sudo dnf install sane-airscan<br></div><div>which said the package was already installed<br></div><div>Got some suggestions from <a href="https://wiki.debian.org/CUPSDriverlessPrinting">https://wiki.debian.org/CUPSDriverlessPrinting</a>, and tried commenting-out the "escl" backend in /etc/sane.d/dll.conf.<br></div><div><br></div><div>% scanimage -L<br></div><div>device `airscan:e0:HP ScanJet Pro 2000 s2 (USB)' is a eSCL HP ScanJet Pro 2000 s2 (USB) ip=127.0.0.1<br></div><div>device `hpaio:/usb/HP_ScanJet_Pro_2000_s2?serial=CN09EA204V' is a Hewlett-Packard HP_ScanJet_Pro_2000_s2 all-in-one<br></div><div>device `hpaio:/net/scanjet_pro_2000_s2?ip=127.0.0.1&queue=false' is a Hewlett-Packard scanjet_pro_2000_s2 all-in-one<br></div><div><br></div><div>(Note: my Canon N1220U now doesn't show up.)<br></div><div>% xsane<br></div><div>now gives me three choices -- vis.,<br></div><div><span class="font" style="font-family:menlo, consolas, monospace, sans-serif;">eSCL HP ScanJet Pro 2 ip=127.0.0.1 [airscan:e0:HP ScanJet Pro 2000 s2 (USB)]</span><span class="font" style="font-family:menlo, consolas, monospace, sans-serif;"><br></span></div><div><span class="font" style="font-family:menlo, consolas, monospace, sans-serif;">Hewlett-Pac HP_ScanJet_Pro_2 all-in-one [hpaio:/usb/HP_ScanJet_Pro_2000_s2?serial=CN09EA204V]</span><span class="font" style="font-family:menlo, consolas, monospace, sans-serif;"><br></span></div><div><span class="font" style="font-family:menlo, consolas, monospace, sans-serif;">Hewlett-Pac scanjet_pro_2000 all-in-one [hpaio:/net/scanjet_pro_2000_s2?ip=127.0.0.1&queue=false]</span><br></div><div><br></div><div>Unfortunately, selecting any one of these three choices results in an error diagnostic --<br></div><div>Failed to open device `name-of-device': Error during device I/O.<br></div><div><br></div><div>Restoring "escl" to /etc/sane.d/dll.conf did not make any difference.<br></div><div><br></div><div>Any further suggestions, please.<br></div><div><br></div><div>Ellis<br></div><div><br></div><div>On Thu, Mar 4, 2021, at 11:42 AM, Alexander Pevzner wrote:<br></div><blockquote type="cite" id="qt" style=""><div>On 3/4/21 10:13 PM, Ellis Cohen wrote:<br></div><div> > Any other suggestion?<br></div><div><br></div><div>OK. Typically USB drivers got broken due to the conflict with ipp-usb on <br></div><div>devices that support this protocol, but there are may be other reasons <br></div><div>for hplip to break.<br></div><div><br></div><div>You may try to install ipp-usb, it will enable sane-airscan on HP <br></div><div>ScanJet Pro 2000.<br></div><div><br></div><div>If HP LaserJet Pro M402dn doesn't support IPP over USB, it will not be <br></div><div>affected. If M402dn does support IPP over USB, there is a good chance <br></div><div>that it will work driverlessly as well, and you will not need hplip, or <br></div><div>you may explicitly blacklist it in the ipp-usb configuration.<br></div><div><br></div><div>-- <br></div><div><br></div><div>Wishes, Alexander Pevzner (<a href="mailto:pzz@apevzner.com">pzz@apevzner.com</a>)<br></div><div><br></div><div><br></div></blockquote><div><br></div></body></html>