[sane-devel] HP ScanJet Pro 2000 sudden failure

[Ellis Cohen]

Plot thickens.  Sigh :-(

I tried
% sudo dnf install ipp-usb
% sudo systemctl {enable,start,status} ipp-usb
which showed that ipp-usb.service was running
% sudo dnf install sane-airscan
which said the package was already installed
Got some suggestions from https://wiki.debian.org/CUPSDriverlessPrinting, and tried commenting-out the "escl" backend in /etc/sane.d/dll.conf.

% scanimage -L
device `airscan:e0:HP ScanJet Pro 2000 s2 (USB)' is a eSCL HP ScanJet Pro 2000 s2 (USB) ip=127.0.0.1
device `hpaio:/usb/HP_ScanJet_Pro_2000_s2?serial=CN09EA204V' is a Hewlett-Packard HP_ScanJet_Pro_2000_s2 all-in-one
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

(Note:  my Canon N1220U now doesn't show up.)
% xsane
now gives me three choices -- vis.,
eSCL        HP ScanJet Pro 2 ip=127.0.0.1 [airscan:e0:HP ScanJet Pro 2000 s2 (USB)]
Hewlett-Pac HP_ScanJet_Pro_2 all-in-one   [hpaio:/usb/HP_ScanJet_Pro_2000_s2?serial=CN09EA204V]
Hewlett-Pac scanjet_pro_2000 all-in-one   [hpaio:/net/scanjet_pro_2000_s2?ip=127.0.0.1&queue=false]

Unfortunately, selecting any one of these three choices results in an error diagnostic --
Failed to open device `name-of-device': Error during device I/O.

Restoring "escl" to /etc/sane.d/dll.conf did not make any difference.

Any further suggestions, please.

Ellis

On Thu, Mar 4, 2021, at 11:42 AM, Alexander Pevzner wrote:
> On 3/4/21 10:13 PM, Ellis Cohen wrote:
>   > Any other suggestion?
> 
> OK. Typically USB drivers got broken due to the conflict with ipp-usb on 
> devices that support this protocol, but there are may be other reasons 
> for hplip to break.
> 
> You may try to install ipp-usb, it will enable sane-airscan on HP 
> ScanJet Pro 2000.
> 
> If HP LaserJet Pro M402dn doesn't support IPP over USB, it will not be 
> affected. If M402dn does support IPP over USB, there is a good chance 
> that it will work driverlessly as well, and you will not need hplip, or 
> you may explicitly blacklist it in the ipp-usb configuration.
> 
> -- 
> 
> Wishes, Alexander Pevzner (pzz at apevzner.com)
> 
> 
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