Need to unplug an replug scanner

Johng · 06-15-2020, 09:28 PM

When I attempt to use xsane, it does not find my Canon scanner.

lsusb:

Code:

  Bus 002 Device 006: ID 04a9:2206 Canon, Inc. CanoScan N650U/N656U

In /etc/sane/.d/canon650u.conf

Code:

 usb 0x04a9 0x2206

In /etc/undev/rules.d/40-libsane.rules:

Code:

 ATTRS{idVendor}=="04a9", ATTRS{idProduct}=="2206", ENV{libsane_matched}="yes"

If I unplug the usb connection, and re-plug, xsane finds the scanner.

Why is that? Is there a command that simulates un-plug/plug?

JZL240I-U · 06-16-2020, 08:44 AM

I seem to remember that Mageia uses KDE / Plasma. If so, right-click on removable media(?, that symbol with which on can eject and mount external devices / device monitoring, sorry I have to translate that from German). You get two lines:

First one like "attend to portable media" or so. Second line like "manage device monitoring program", click here and activate "all devices"; "Show popup when new device is attache" stayes active. HTH.

hazel · 06-16-2020, 11:26 AM

I had something like that once. When I checked dmesg, I found that the scanner's usb connection kept dropping and reconnecting, each time with a different bus number. I used a different cable and the problem disappeared.

dixiehall · 07-13-2020, 10:46 PM

Thank you all, Ill have a look into

ferrari · 07-14-2020, 01:59 AM

USB auto-suspend references:
https://hamwaves.com/usb.autosuspend/en/index.html
https://wiki.archlinux.org/index.php...SB_autosuspend
https://ywjheart.wordpress.com/2018/...ubuntu-debian/
https://www.kernel.org/doc/html/v4.1....html#warnings