Scanner does not work in SCX-3405W after printing with CUPS

[jpalus]

I've got a multi-function printer/scanner device Samsung SCX-3405W and noticed that after first page is printed in CUPS scanner stops responding. It appears to be caused by quirk for all Samsung printers:

# All Samsung devices (https://bugs.launchpad.net/bugs/1032456)
0x04e8 soft-reset

Not really sure why it was applied so broadly but after disabling it printing works perfectly fine as well as scanning.

[zdohnal]

Hi @jpalus ,

thank you for reporting the issue!

It would be great if you entered lsusb command on your machine and pasted the output here in the issue - we will need vendor and product IDs for whitelisting your device, since it works without a quirk.
And then I will need a help from you, because we will need to verify the change, which will be different than what you proposed - removing the lines you mentioned can break printing for others, so I will try to propose to whitelist your printer model.

@michaelrsweet my idea is to get vendor and product IDs of the device and then put it into backend/org.cups.usb-quirks with whitelist keyword - the new entry will need to be after the generic Samsung rule to have an effect. WDYT? Should I look out for something else?

[jpalus]

@zdohnal: relevant entry from lsusb:

Bus 004 Device 002: ID 04e8:344f Samsung Electronics Co., Ltd SCX-3400 Series

Regarding solution I've been thinking about it and came to similar solution to yours but a little more extended so it's a bit easier to customize for a user:

1. add no-quirks keyword (same as your whitelist)
2. allow quirks to be added by user and loaded ie from /etc/cups/usb/org.cups.usb-quirks (would require searching for existing quirk instead of always adding new one)
3. allow multiple quirk keywords so it's possible to override quirk in just one line ie 04e8 no-quirks no-reattach (made-up example)

[zdohnal]

Bus 004 Device 002: ID 04e8:344f Samsung Electronics Co., Ltd SCX-3400 Series

Thank you for the data!

Regarding solution I've been thinking about it and came to similar solution to yours but a little more extended so it's a bit easier to customize for a user:

1. add `no-quirks` keyword (same as your `whitelist`)

I don't see a reason why a new keyword should be added.

2. allow quirks to be added by user and loaded ie from `/etc/cups/usb/org.cups.usb-quirks` (would require searching for existing quirk instead of always adding new one)

Doable even now - I have /usr/share/cups/usb/org.cups.usb-quirks file in Fedora, where new quirks can be added.

3. allow multiple quirk keywords so it's possible to override quirk in just one line ie `04e8 no-quirks no-reattach` (made-up example)

As you can see in the mentioned file, a list of quirk keywords are already supported.

===============================================================

Would you mind putting the original line back:

# All Samsung devices (https://bugs.launchpad.net/bugs/1032456)
0x04e8 soft-reset

then put right under it:

# Samsung SCX-3405W
0x04e8 0x344f whitelist

and try to print?

[jpalus]

Confirmed it works fine.

[zdohnal]

@michaelrsweet Created a PR for the issue with the tested solution. Please let me know if the solution is incorrect once you have a moment.