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simple-scan fails with Canon LiDE 300--except as root

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After using a rather old Canon scanner for many years, I recently upgraded to the Canon LiDE 300, and installed the drivers as directed, on a Bullseye system (10.2.0-17).

The printer is recognized:

$ scanimage -L
device `pixma:04A91913_47A8A4' is a CANON CanoScan LiDE 300 multi-function peripheral
device `escl:http://127.0.0.1:60000' is a Canon LiDE 300 (USB) flatbed scanner

When I run simple-scan, it detects the printer and announces itself ready to go, but when I try to scan anything, I get the message "Failed to scan Unable to connect to scanner". I Googled for anything related to this; there's a bunch of stuff on Ubuntu and Mint forums about purging the "ippusbxd" package, but this isn't on Debian.

I then ran simple-scan with the debug flag, and at the moment I try to initiate a scan, I got:

[+20.83s] DEBUG: simple-scan.vala:1817: Requesting scan at 150 dpi from device 'escl:http://127.0.0.1:60000'
[+20.83s] DEBUG: scanner.vala:1683: Scanner.scan ("escl:http://127.0.0.1:60000", dpi=150, scan_mode=ScanMode.GRAY, depth=2, type=single, paper_width=0, paper_height=0, brightness=0, contrast=0, delay=3000ms)
[+20.83s] DEBUG: scanner.vala:828: Processing request
[+20.83s] DEBUG: scanner.vala:889: sane_open ("escl:http://127.0.0.1:60000") -> SANE_STATUS_NO_MEM
[+20.83s] WARNING: scanner.vala:893: Unable to open device: Out of memory


I'm not sure what could be going on, as I have a ton of memory on my system.

I don't know why I tried this, but I then ran simple-scan as root, and...it worked perfectly.

I'm bewildered by this--any idea what I should be looking at?

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Thread

simple-scan fails with Canon LiDE 300--except as root Jen Nussbaum <bg271828@yahoo.com> - 2021-01-08 23:50 +0100
  Re: simple-scan fails with Canon LiDE 300--except as root ghe2001 <ghe2001@protonmail.com> - 2021-01-09 00:30 +0100
    Vim fails with some unspecified out-of-memory error [was: Re:  simple-scan fails with Canon LiDE 300--except as root] Andrei POPESCU <andreimpopescu@gmail.com> - 2021-01-09 07:50 +0100
  Re: simple-scan fails with Canon LiDE 300--except as root Brian <ad44@cityscape.co.uk> - 2021-01-09 01:10 +0100
    Re: simple-scan fails with Canon LiDE 300--except as root "Dr. Jennifer Nussbaum" <bg271828@yahoo.com> - 2021-01-09 05:00 +0100
      Re: simple-scan fails with Canon LiDE 300--except as root Brian <ad44@cityscape.co.uk> - 2021-01-09 13:20 +0100
        Re: simple-scan fails with Canon LiDE 300--except as root "Dr. Jennifer Nussbaum" <bg271828@yahoo.com> - 2021-01-09 13:40 +0100
          Re: simple-scan fails with Canon LiDE 300--except as root Brian <ad44@cityscape.co.uk> - 2021-01-09 13:50 +0100
            Re: simple-scan fails with Canon LiDE 300--except as root "Dr. Jennifer Nussbaum" <bg271828@yahoo.com> - 2021-01-09 14:00 +0100
              Re: simple-scan fails with Canon LiDE 300--except as root Brian <ad44@cityscape.co.uk> - 2021-01-09 14:10 +0100
                Re: simple-scan fails with Canon LiDE 300--except as root "Dr. Jennifer Nussbaum" <bg271828@yahoo.com> - 2021-01-09 14:30 +0100
                Re: simple-scan fails with Canon LiDE 300--except as root Brian <ad44@cityscape.co.uk> - 2021-01-09 14:50 +0100
                Re: simple-scan fails with Canon LiDE 300--except as root Brian <ad44@cityscape.co.uk> - 2021-01-09 15:20 +0100

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