I have a HP Laserjet M1136 MFP that it did not use for the last three years. It was working beautifully with simple-scan at that time.
Now, I set up again with hp-setup and reinstalled the simple-scan package.
On launching this latest application, the hp printer appears, the top left indicates scan, it says ready to scan, but when I launch it it says: failure, impossible to connect to the digitalisation peripheric (in French)
I also have an HP device.
I start simple-scan once as root so that the scanner can be found.
So that no file permissions are broken it is a simple thing with this command.
sudo -H simple-scan
I think it would also work with gksu or for kdesu depending on the desktop type.
Give skanlite a try see if this works with your printer/scanner. I’ve got an old usb HP6200C flatbed
scanner and it works with it. I also loaded simple-scan up and ran it.It also worked. Is there any HP driver installation that needs to be fixed? I’ve had issues for the longest time with HP and my p1006 laser printer but it works with the HPLIP finally. It required a proprietary HP driver download everytime to get it to setup and work with HPLIP. Everything is good now.