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<p>If you want to use hplip for scanning and its hpaio backend, you
will probably need their proprietary plugin which you can download
by 'hp-plugin -i'. Although their web page says otherwise, most of
their scanning devices need their proprietary plugin.</p>
<p>I strongly recommend uninstalling hplip and using ipp-usb +
sane-airscan/sane-escl if your device supports it, as it supports
in your case.<br>
</p>
<div class="moz-cite-prefix">On 5/16/21 10:26 PM, Ellis Cohen wrote:<br>
</div>
<blockquote type="cite"
cite="mid:cbd8f91c-ea79-4f87-b6f2-0d6d607dbc25@www.fastmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<div>Due to a hard failure in the boot loader, I had to completely
re-install my Fedora 33 system. (My attempts to just re-install
the boot loader didn't work.) Everything's once again working
(including my printer) *except* for the HP ScanJet Pro 2000 s2
scanner.<br>
</div>
<div><br>
</div>
<div>'scanimage -L' displays<br>
</div>
<blockquote type="cite">
<div>device `plustek:libusb:003:005' is a Canon CanoScan N1220U
flatbed scanner<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>
</blockquote>
<div><br>
</div>
<div>(The Canon N21220U is an oldie-but-goodie that I can access,
but isn't my concern. I want to use the ScanJet Pro.)<br>
</div>
<div><br>
</div>
<div>No matter whether ipp-usb is<br>
</div>
<ul>
<li>installed and running,<br>
</li>
<li>installed and not running, or<br>
</li>
<li>not installed,<br>
</li>
</ul>
<div>and regardless of which of the three choices above I'm using
to access the scanner,<br>
</div>
<div>in all cases I get the unhelpful diagnostic message<br>
</div>
<blockquote type="cite">
<div>Failed to open device
`hpaio:/usr/HP_ScanJet_pro_2000_s2?serial=CN09EA204V'<br>
</div>
<div>Error during device I/O.<br>
</div>
</blockquote>
<div><br>
</div>
<div>I also tried removing the 'hplip' package, but that didn't
help either.<br>
</div>
<div><br>
</div>
<div>Any thoughts on what might be broken? Any debugging I could
enable that might shed light? Any further information I could
provide to help diagnose?<br>
</div>
<div><br>
</div>
<div>Thanks for any help you can provide.<br>
</div>
<div><br>
</div>
<div>Ellis<br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>On Fri, Mar 5, 2021, at 9:33 AM, Ellis Cohen wrote:<br>
</div>
<blockquote type="cite" id="qt" style="">
<div>Thanks for your help! IPP-over-USB <i>was</i> the
culprit (although I have no idea exactly what latest-update
from Fedora changed previous behavior).<br>
</div>
<div><br>
</div>
<div>I determined that for my configuration, it was
least-invasive to simply execute<br>
</div>
<div><br>
</div>
<blockquote type="cite">
<div><span class="qt-font" style=""><span class="font"
style="font-family:menlo, consolas, monospace,
sans-serif;">ipp_usb_was_active=false</span></span><span
class="qt-font" style=""><span class="font"
style="font-family:menlo, consolas, monospace,
sans-serif;"></span></span><br>
</div>
<div><span class="qt-font" style=""><span class="font"
style="font-family:menlo, consolas, monospace,
sans-serif;">sudo systemctl --quiet is-active ipp-usb</span></span><span
class="qt-font" style=""><span class="font"
style="font-family:menlo, consolas, monospace,
sans-serif;"></span></span><br>
</div>
<div><span class="qt-font" style=""><span class="font"
style="font-family:menlo, consolas, monospace,
sans-serif;">if [ $? -eq 0 ] ; then</span></span><span
class="qt-font" style=""><span class="font"
style="font-family:menlo, consolas, monospace,
sans-serif;"></span></span><br>
</div>
<div><span class="qt-font" style=""><span class="font"
style="font-family:menlo, consolas, monospace,
sans-serif;"> ipp_usb_was_active=true</span></span><span
class="qt-font" style=""><span class="font"
style="font-family:menlo, consolas, monospace,
sans-serif;"></span></span><br>
</div>
<div><span class="qt-font" style=""><span class="font"
style="font-family:menlo, consolas, monospace,
sans-serif;"> sudo systemctl stop ipp-usb</span></span><span
class="qt-font" style=""><span class="font"
style="font-family:menlo, consolas, monospace,
sans-serif;"></span></span><br>
</div>
<div><span class="qt-font" style=""><span class="font"
style="font-family:menlo, consolas, monospace,
sans-serif;">fi</span></span><br>
</div>
</blockquote>
<div><br>
</div>
<div>before scanning, and<br>
</div>
<div><br>
</div>
<blockquote type="cite">
<div><span class="qt-font" style=""><span class="font"
style="font-family:menlo, consolas, monospace,
sans-serif;">${ipp_usb_was_active} && sudo
systemctl start ipp-usb</span></span><br>
</div>
</blockquote>
<div><br>
</div>
<div>afterwards.<br>
</div>
<div><br>
</div>
<div>Again, thanks muchly!<br>
</div>
<div><br>
</div>
<div>Ellis<br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>On Thu, Mar 4, 2021, at 9:43 PM, Zdenek Dohnal wrote:<br>
</div>
<blockquote type="cite" id="qt-qt" style="">
<div><br>
</div>
<div>On 3/4/21 7:39 PM, Alexander Pevzner wrote:<br>
</div>
<div>><br>
</div>
<div>> 2) Remove hplip and scan driverlessly:<br>
</div>
<div>><br>
</div>
<div>> dnf erase hplip<br>
</div>
<div>> dnf install sane-airscan<br>
</div>
<div>><br>
</div>
<div>Btw, sane-airscan is installed by default if you have
sane-backends<br>
</div>
<div>installed :) . I changed that later...<br>
</div>
<div><br>
</div>
<div>-- <br>
</div>
<div>Zdenek Dohnal<br>
</div>
<div>Software Engineer<br>
</div>
<div>Red Hat Czech - Brno TPB-C<br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div><b>Attachments:</b><br>
</div>
<ul>
<li>OpenPGP_signature<br>
</li>
</ul>
</blockquote>
<div><br>
</div>
</blockquote>
<div><br>
</div>
</blockquote>
<pre class="moz-signature" cols="72">--
Zdenek Dohnal
Software Engineer
Red Hat Czech - Brno TPB-C
</pre>
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