[SOLVED] Canon Printer is not detected

nik0la · 2026-07-17 20:02:02

Hi, I'm new.

I'm trying to use Canon LBP6020B printer. I've installed CUPS and Canon CAPT. The problem is the printer is not working. I'm printing from the brave browser with Ctrl+P, if it matters.

first I checked the jobs list and it said: "cfFilterChain: pdftops (PID 14193) exited with no errors."

Then I ran lsusb and here's the output:

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 001 Device 003: ID 1bcf:2c54 Sunplus Innovation Technology Inc. HD WebCam
Bus 001 Device 005: ID 0489:e078 Foxconn / Hon Hai 
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

The output doesn't change when I unplug the printer's USB so the printer is clearly not being detected.

Last edited by nik0la (2026-07-18 21:14:36)

seth · 2026-07-17 20:33:56

Did you read https://wiki.archlinux.org/title/Canon_CAPT ?
What's the printer status?

nik0la · 2026-07-17 21:05:25

captstatusui isn't working proprely it says

(captstatusui:16443): Gtk-WARNING **: 01:02:32.260: cannot open display:

I don't know any other way to check

seth · 2026-07-17 21:10:57

You'll probably need xwayland (or an X11 session) - "sudo ccpdadmin status" should™ work regardless.

nik0la · 2026-07-17 21:18:24

 CUPS_ConfigPath = /etc/cups/
 LOG Path        = None
 UI Port         = 59787

 Entry Num  : Spooler	: Backend	: FIFO path		: Device Path 	: Status 
 ----------------------------------------------------------------------------
     [0]    : printer 	: ccp 		: //localhost:59787 	: /dev/usb/lp0 	: 
     [1]    : LBP6020B 	: ccp 		: //localhost:59787 	: /dev/usb/lp0 	: 
     [2]    : LBP6020 	: ccp 		: //localhost:59687 	: /dev/usb/lp1 	:

This is the output. I added 3 printers with different tweaks in hopes that one of them would work.

seth · 2026-07-17 21:56:12

ss -tulpen | grep -E '59.87'
stat dev/usb/lp*

If you run

dmesg -W

and attach the printer (and power it on) - what tail does that generate?

nik0la · 2026-07-18 07:58:57

On the first one it says

stat: cannot statx 'dev/usb/lp*': No such file or directory

On dmesg -W it says:

[  651.519431] usb 1-2.3: new high-speed USB device number 6 using xhci_hcd
[  651.707600] usb 1-2.3: New USB device found, idVendor=04a9, idProduct=2771, bcdDevice= 1.00
[  651.707641] usb 1-2.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  651.707662] usb 1-2.3: Product: Canon CAPT USB Device
[  651.707679] usb 1-2.3: Manufacturer: Canon
[  651.707694] usb 1-2.3: SerialNumber: 0000A1D62ANS
[  651.792143] usblp 1-2.3:1.0: usblp0: USB Bidirectional printer dev 6 if 0 alt 0 proto 2 vid 0x04A9 pid 0x2771

Last edited by nik0la (2026-07-18 08:01:18)

seth · 2026-07-18 08:35:58

You'd expect that to
1. appear in lsusb
2. generate "/dev/usb/lp0" (I typo'd away the initial slash and you didn't pick up on that, so re-ceck)

Lone_Wolf · 2026-07-18 08:49:08

Moderator Note
moving to AUR Issues, Discussion & PKGBUILD Requests

nik0la · 2026-07-18 09:54:31

seth wrote:

You'd expect that to
1. appear in lsusb

Yeah it did now

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 001 Device 003: ID 1bcf:2c54 Sunplus Innovation Technology Inc. HD WebCam
Bus 001 Device 005: ID 0489:e078 Foxconn / Hon Hai 
Bus 001 Device 007: ID 04a9:2771 Canon, Inc. LBP6020
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

The Canon printer appeared.

2. generate "/dev/usb/lp0" (I typo'd away the initial slash and you didn't pick up on that, so re-ceck)

I redid the command without the typo

stat /dev/usb/lp*

and it did have an output this time

  File: /dev/usb/lp0
  Size: 0         	Blocks: 0          IO Block: 4096   character special file
Device: 0,7	Inode: 744         Links: 1     Device type: 180,0
Access: (0660/crw-rw----)  Uid: (    0/    root)   Gid: (  989/      lp)
Access: 2026-07-18 11:57:16.284948966 +0400
Modify: 2026-07-18 11:57:16.284948966 +0400
Change: 2026-07-18 11:57:16.284948966 +0400
 Birth: 2026-07-18 11:57:16.265948967 +0400

There are new printers named "LBP6020-2" and "LBP6020-3" I registered them both with the commands:

sudo ccpdadmin -p LBP6020-2 -o /dev/usb/lp0
sudo ccpdadmin -p LBP6020-3 -o /dev/usb/lp0

When I try to print from those it still doesn't print for some reason. It says that the job is completed but the printer isn't doing anything.

When I run captstatusui -P LBP6020 (it works now) the window says

Message:
Communication Error

Check the following:
- Is the printer turned on?
- Is the cable properly connected?

I checked on the LBP6020-2 and LBP6020-3, when I'm not printing something the Message says sleeping but when I try to print something it says the same thing as above.

Last edited by nik0la (2026-07-18 10:11:58)

seth · 2026-07-18 16:06:00

When I run captstatusui -P LBP6020 (it works now) the window says

     [2]    : LBP6020 	: ccp 		: //localhost:59687 	: /dev/usb/lp1 	:

Wrong device? What about "LBP6020B"?

Other than that: https://wiki.archlinux.org/title/CUPS/T … #Debug_log
Don't forget to restart cups, try to print something and post the log.

nik0la · 2026-07-18 16:43:37

Wrong device? What about "LBP6020B"?

The printer is seen as LBP6020. When I run lsusb this is how the printer shows up:

Bus 001 Device 006: ID 04a9:2771 Canon, Inc. LBP6020

I checked it here when I first started setting this up: https://wiki.archlinux.org/title/CUPS/P … lems#Canon
There is no LBP6020B listed anywhere, only LBP6020, so I just ran with it.

Other than that: https://wiki.archlinux.org/title/CUPS/T … #Debug_log
Don't forget to restart cups, try to print something and post the log.

The log is almost 1000 lines from before printing to after, should I post it all or should I post a specific section? Or am I using the log incorrectly?

seth · 2026-07-18 16:50:50

There is no LBP6020B listed anywhere

https://bbs.archlinux.org/viewtopic.php … 4#p2304864
You created it and the one you're using points at the (non-existing, I assume) lp1

should I post it all

Yes, see the 1st link below

nik0la · 2026-07-18 17:12:00

https://bbs.archlinux.org/viewtopic.php … 4#p2304864
You created it and the one you're using points at the (non-existing, I assume) lp1

Yup, I deleted those three you see on that post. LBP6020-2 and LBP6020-3 got created automatically so I trust those more, they point at the lp0

 Entry Num  : Spooler	: Backend	: FIFO path		: Device Path 	: Status 
 ----------------------------------------------------------------------------
     [0]    : LBP6020-2 	: usb 		: //Canon/LBP6020?serial=0000A1D62ANS 	: /dev/usb/lp0 	: 
     [1]    : LBP6020-3 	: usb 		: //Canon/LBP6020?serial=0000A1D62ANS 	: /dev/usb/lp0 	:

Yes, see the 1st link below

https://paste.c-net.org/HersheyApology

Last edited by nik0la (2026-07-18 17:21:21)

seth · 2026-07-18 20:25:58

D [18/Jul/2026:20:34:40 +0400] [Job 48] pstocapt3 (application/vnd.cups-postscript to printer/LBP6020-2, cost 0)
…
D [18/Jul/2026:20:34:47 +0400] [Job 48] Sent 64952 bytes...
D [18/Jul/2026:20:34:47 +0400] [Job 48] Waiting for read thread to exit...
D [18/Jul/2026:20:34:47 +0400] [Job 48] PID 11219 (/usr/lib/cups/filter/pstocapt3) exited with no errors.
…
D [18/Jul/2026:20:34:54 +0400] [Job 48] Read thread still active, aborting the pending read...
D [18/Jul/2026:20:34:55 +0400] [Job 48] PID 11220 (/usr/lib/cups/backend/usb) exited with no errors.

On the cups side everything's "fine", pstocapt3 finishes but it just gives up after ~7s waiting for a response from the usb.

captstatusui -P LBP6020-2

seth also wrote:

ss -tulpen | grep -E '59.87'

nik0la · 2026-07-18 20:47:40

did this

captstatusui -P LBP6020-2

and status monitor said message: sleeping

and then did this again

ss -tulpen | grep -E '59.87'

nothing changed on the status monitor

it still says Communication Error when I try to print.

seth · 2026-07-18 20:49:04

nothing changed on the status monitor

The command queries the listening sockets and filters them for some ports - it won't do anything but I'm curious about the output.

nik0la · 2026-07-18 20:51:24

Oh sorry forgot to post that even though I reminded myself to do so
Here's the output:

tcp   LISTEN 0      64            0.0.0.0:59787      0.0.0.0:*    ino:8067 sk:1001 cgroup:/system.slice/ccpd.service <->                                                                        
tcp   LISTEN 0      64            0.0.0.0:59687      0.0.0.0:*    ino:8066 sk:1002 cgroup:/system.slice/ccpd.service <->

seth · 2026-07-18 20:57:01

It's actually listening on both ports, but the autogenerated (?) printers are on //Canon/LBP6020?serial=0000A1D62ANS
Have you tried adding one on //localhost:59787 or //localhost:59687 ?

nik0la · 2026-07-18 21:04:37

Have you tried adding one on //localhost:59787 or //localhost:59687 ?

The ones I added manually actually had those. one was using 59787 and the other 59687.

I'll try adding one manually again.

nik0la · 2026-07-18 21:10:07

Added a printer manually and it works now. thanks for your help.
I should add "[SOLVED]" now right?

Last edited by nik0la (2026-07-18 21:54:13)

Arch Linux

#1 2026-07-17 20:02:02

[SOLVED] Canon Printer is not detected

#2 2026-07-17 20:33:56

Re: [SOLVED] Canon Printer is not detected

#3 2026-07-17 21:05:25

Re: [SOLVED] Canon Printer is not detected

#4 2026-07-17 21:10:57

Re: [SOLVED] Canon Printer is not detected

#5 2026-07-17 21:18:24

Re: [SOLVED] Canon Printer is not detected

#6 2026-07-17 21:56:12

Re: [SOLVED] Canon Printer is not detected

#7 2026-07-18 07:58:57

Re: [SOLVED] Canon Printer is not detected

#8 2026-07-18 08:35:58

Re: [SOLVED] Canon Printer is not detected

#9 2026-07-18 08:49:08

Re: [SOLVED] Canon Printer is not detected

#10 2026-07-18 09:54:31

Re: [SOLVED] Canon Printer is not detected

#11 2026-07-18 16:06:00

Re: [SOLVED] Canon Printer is not detected

#12 2026-07-18 16:43:37

Re: [SOLVED] Canon Printer is not detected

#13 2026-07-18 16:50:50

Re: [SOLVED] Canon Printer is not detected

#14 2026-07-18 17:12:00

Re: [SOLVED] Canon Printer is not detected

#15 2026-07-18 20:25:58

Re: [SOLVED] Canon Printer is not detected

#16 2026-07-18 20:47:40

Re: [SOLVED] Canon Printer is not detected

#17 2026-07-18 20:49:04

Re: [SOLVED] Canon Printer is not detected

#18 2026-07-18 20:51:24

Re: [SOLVED] Canon Printer is not detected

#19 2026-07-18 20:57:01

Re: [SOLVED] Canon Printer is not detected

#20 2026-07-18 21:04:37

Re: [SOLVED] Canon Printer is not detected

#21 2026-07-18 21:10:07

Re: [SOLVED] Canon Printer is not detected

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