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From: "TonicLab.ru" <info@toniclab.ru>
To: linux-usb@vger.kernel.org
Subject: /dev/ttyUSB0 file disappears on Ubuntu 22.04
Date: Wed, 01 Jun 2022 19:37:45 +0300	[thread overview]
Message-ID: <4b9e024d14c40cba7c04d5879ae64866@toniclab.ru> (raw)

Hi all,

This problem appeared on a freshly installed Ubuntu 22.04 desktop. Not 
sure I need to post this here.

When I'm attaching a ftdi device into usb everything looks great but 
there's no /dev/ttyUSB0 file. Seems it created and then disappeared. I 
tried to remove brltty package (as some recommends on the net) but it 
didn't help. The same ftdi device works on older Ubuntu version w/o any 
problems.

I'm having this in syslog:
Jun  1 16:58:09 qgs-comp kernel: [  538.642086] usb 2-1.5: new 
full-speed USB device number 5 using ehci-pci
Jun  1 16:58:10 qgs-comp kernel: [  538.756437] usb 2-1.5: New USB 
device found, idVendor=0403, idProduct=6001, bcdDevice= 6.00
Jun  1 16:58:10 qgs-comp kernel: [  538.756445] usb 2-1.5: New USB 
device strings: Mfr=1, Product=2, SerialNumber=3
Jun  1 16:58:10 qgs-comp kernel: [  538.756448] usb 2-1.5: Product: USB 
Serial
Jun  1 16:58:10 qgs-comp kernel: [  538.756450] usb 2-1.5: Manufacturer: 
FTDI
Jun  1 16:58:10 qgs-comp kernel: [  538.756452] usb 2-1.5: SerialNumber: 
FT0KKBIF
Jun  1 16:58:10 qgs-comp kernel: [  538.759677] ftdi_sio 2-1.5:1.0: FTDI 
USB Serial Device converter detected
Jun  1 16:58:10 qgs-comp kernel: [  538.759713] usb 2-1.5: Detected 
FT232RL
Jun  1 16:58:10 qgs-comp kernel: [  538.760546] usb 2-1.5: FTDI USB 
Serial Device converter now attached to ttyUSB0
Jun  1 16:58:01 qgs-comp colord-sane: message repeated 2 times: [ 
io/hpmud/musb.c 2101: Invalid usb_open: Permission denied]
Jun  1 16:58:10 qgs-comp mtp-probe: checking bus 2, device 5: 
"/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5"
Jun  1 16:58:10 qgs-comp mtp-probe: bus: 2, device: 5 was not an MTP 
device
Jun  1 16:58:10 qgs-comp systemd-udevd[5394]: 2-1.5: Failed to 
create/update device symlink '/dev/ttyUSB0', ignoring: File exists
Jun  1 16:58:10 qgs-comp snapd[942]: hotplug.go:199: hotplug device add 
event ignored, enable experimental.hotplug
Jun  1 16:58:10 qgs-comp mtp-probe: checking bus 2, device 5: 
"/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5"
Jun  1 16:58:10 qgs-comp mtp-probe: bus: 2, device: 5 was not an MTP 
device
Jun  1 16:58:10 qgs-comp colord-sane: io/hpmud/musb.c 2101: Invalid 
usb_open: Permission denied

I noticed this line:

Jun  1 16:58:10 qgs-comp systemd-udevd[5394]: 2-1.5: Failed to 
create/update device symlink '/dev/ttyUSB0', ignoring: File exists

Why is it happening? There's no /dev/ttyUSB0 neither before nor after I 
attach ftdi device to a USB port.

thanks

             reply	other threads:[~2022-06-01 16:44 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-01 16:37 TonicLab.ru [this message]
2022-06-02  6:02 ` /dev/ttyUSB0 file disappears on Ubuntu 22.04 Greg KH
2022-06-02  8:47   ` Yuri
2022-06-03  6:44     ` Greg KH
2022-06-04  5:31       ` Yuri

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