brent Its interesting
Should be so simple its not funny.

      brent I delete, printer from "imprimante". I do not know where printer folder is. I reboot with printer on but it does not work

          emmerich you started fresh and it doesnt even see epson in any way shape of form?
          did you start and the beginning with 'add a printer.'?

          is the epson in 'add printer'?

          (generic cups is in mine, but I did not install)

            Axios printing issues like this I--and you--could solve pretty easily. these days not so much. I wonder what changed? I feel like I got smarter with a trick bag over the years not dumber...I feel dumb on these threads anymore.

            the last couple we tried to help never wanted to do the 'mapping ip address' trick. I have only had success with that..but it's hard to find the true printer IP. seems easier to find the usb:http:// number. not sure these are the same.
            anyway.

                These steps in order.
                1 delete that printer from printers
                2 click on add printer its not going find it but add the generic cups (thats the one you are going to change)
                3 select printer and add from database (find your printer there and add it)
                4 change Name to (Epson_Stylus_Photo_RX520) exactly
                5 At some point should have had system popup saying printer added
                6 when your done should look like this

                  brent Ya seems like the printer gremlins are restless lately
                  I think Solus is just seeing more traffic and use (which is good) so more things are being seen
                  Its always a challenge helping ppl remotely cant be an attitude thing for people or one way street
                  when others are trying to help.
                  Lot of need for instant gratification out there life just does not work that way.

                  Axios falls off his soap box--Thud

                      Axios Its always a challenge helping ppl remotely cant be an attitude thing for people or one way street
                      when others are trying to help.
                      Lot of need for instant gratification out there life just does not work that way.

                      Axios falls off his soap box--Thud

                      plus I think there was a language barrier here. When I knew nothing about Linux (still) and I ran into problems, I was very open to the troubleshooting process, still am. I understand for peripherals and Linux there was no instant gratification---and what you touched upon is KEY: if you want it bad enough you can make it happen. Even if it took days.
                      I wish more people would do the IP address thing, it has saved my bacon and basically seems foolproof to get a printer seen by Solus (or whatever). No one wants to go that far down the hole! At least with the last few we helped out out in it would confirm something or rule something out.

                      yeah I also agree the printer gremlins are really whacked out lately

                      I'm also off the soapbox and off topic!🙂

                        Axios Hello, I made exactly the procedure from 1 to 6. It does not work even Solus said the test page is print.

                            emmerich
                            Last ditch effort I tried it and sets connection Do from terminal
                            Sorry I forgot about the connection setting.

                            1 lpinfo -v should see something like this for your RX520 (direct usb://ZP/LazerJet%20MFP?serial=42)
                            so it would look like this ( lpadmin -p Epson_Stylus_Photo_RX520 -v usb://ZP/LazerJet%20MFP?serial=42)
                            (Example)

                            2 add that line to the end of this and hit enter (lpadmin -p Epson_Stylus_Photo_RX520 -v )
                            3 should have changed the connection for the Epson_Stylus_Photo_RX520 printer
                            we should be connected to printer if all went well.
                            4 test
                            If you dont show your printer in 1 then we have deeper issues.

                            Note This is a follow up providing you didnt change your previous settings in previous post
                            meant to be done along with it.

                            Thanks for doing that

                                emmerich Does lsusb show it connected
                                Also I would try uninstalling Sane it can cause issues with some printers.

                                Makes sense why it cant auto detect your printer one Line away from working sheesh

                                Note Just thinking sudo scanimage -L if it shows addy for printer might be able to use it you said scanner
                                was working

                                If this doesnt yield results am out of ideas for moment maybe somebody has another idea.

                                    Axios If this doesnt yield results am out of ideas for moment maybe somebody has another idea.

                                    manually map ip address in printer dialogue is all I got. force solus to see it.
                                    see a lot of this no autodetect lately--I can't even begin to know what that is all about. maybe you are right too many backends (sane) installed?

                                      Axios the sudo scanimage -L shows the scanner :
                                      But I do not understand what to do wthit the description of the device.

                                        Axios in adtion the answer with lsub with the detection of the printer

                                            emmerich Use this command in the previous post and see if it works (It wont dork anything)
                                            lpadmin -p Epson_Stylus_Photo_RX520 -v epson2:libusb:001:005

                                            Something software wise is keeping it from being seen its seeing scanner fine

                                            I think if the above does not work uninstall sane -shutdown-unplug printer
                                            when booted up fully plug printer back in and try to add printer like normal.

                                            What we did was set it up manual but without the connection info it does not know where to send it.
                                            thats why when you print test it prints a loop with those 2 notifications.

                                            I know linux had bug issues with sane keeping printer from detection just process of elimination
                                            If all that fails I am kinda in the dark but at least we know whats happening
                                            and maybe Mods-Dev have a answer.
                                            Its just I dont know all the deep inner workings of linux.

                                            Let us know what happens

                                            Edit- I was just looking you might try setting up a new printer using the pm 750 driver worth a try

                                                Axios Could you tell me how to remove Sane. In the software center there many paskage and I do not know the command for the terminal.

                                                  I remove sane and reboot and Solus find immediatly the printer and it's work. Thanks a lot.
                                                  Now I will re-intall sane because my mother use also the scanner.
                                                  But if I reinstall sane the printer does not work :-(
                                                  I will try to find another solution for my mother. thanks for your help and patience.

                                                    emmerich There suppose to be a workaround for that but I will
                                                    have to study that abit.
                                                    Sometimes sequence makes a difference but appears not in this case
                                                    Its doing what the article I read said..sheesh
                                                    I am glad we found the issue!!!

                                                    Oh you did it right removing it with software center

                                                      Question for the Mods
                                                      Why is sane taking control of his printer should it not be essential separate from printer
                                                      even tho its a combo printer.
                                                      when he installs sane back his printer stops working.

                                                      Thanks

                                                        Axios [not a mod but I believe from output above the OP has epsonscan2 installed for the scanner. If not, he should get it. it's flatpak and won't interfere with printer ever.]