<!DOCTYPE html><html><head><title></title><style type="text/css">p.MsoNormal,p.MsoNoSpacing{margin:0}</style></head><body><ul><li>'sudo dnf remove ipp-usb' fails with 'No match for argument: ipp-usb'<br>In other words, I never installed that RPM. ('dnf search ipp-usb' does find it in a repository.)<br></li><li><div>'rpm -qa | grep ipp' only shows<br>polyclipping-6.4.2-10.fc33.x86_64<br></div><div> cups-ipptool-2.3.3op2-1.fc33.x86_64<br><br>I tried stopping the 'cups' service, but still couldn't access the HP scanner.<br><br></div></li><li>'rpm -qa | grep usb' shows<br></li></ul><div>libusb-0.1.7-2.fc33.x86_64<br></div><div>libgusb-0.3.5-1.fc33.x86_64<br></div><div>libusbmuxd-2.0.2-3.fc33.x86_64<br></div><div>usbutils-012-5.fc33.x86_64<br></div><div>usbredir-0.8.0-5.fc33.x86_64<br></div><div>usbmuxd-1.1.1-3.fc33.x86_64<br></div><div>usb_modeswitch-data-20191128-3.fc33.noarch<br></div><div>usb_modeswitch-2.6.1-1.fc33.x86_64<br></div><div>libusbx-1.0.24-2.fc33.x86_64<br></div><div>libusbx-1.0.24-2.fc33.i686</div><ul><li>I hesitate to remove 'hplip' as, besides the HP ScanJet Pro 2000 s2 (scanner), I also have an HP LaserJet Pro M402dn (printer) which works well.<br></li></ul><div>Any other suggestion?<br></div><div><br></div><div>On Thu, Mar 4, 2021, at 10:39 AM, Alexander Pevzner wrote:<br></div><blockquote type="cite" id="qt" style=""><div>Hi Ellis,<br></div><div><br></div><div>On 3/4/21 9:13 PM, Ellis Cohen wrote:<br></div><div>> bInterfaceClass 7 Printer<br></div><div>> bInterfaceSubClass 1 Printer<br></div><div>> bInterfaceProtocol 4<br></div><div>Your printer supports IPP over USB. It causes IPP over USB daemon to run <br></div><div>and keep printer's USB ports open, which conflicts with hplip.<br></div><div><br></div><div>From now, you have two options:<br></div><div><br></div><div>1) Remove IPP over USB daemon, which will unblock hplip:<br></div><div><br></div><div> dnf erase ipp-usb<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>-- <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>