[Bug 874181] Re: brltty daemon prevents creation of ttyUSB0 device link
Paride Legovini
874181 at bugs.launchpad.net
Tue Mar 22 22:22:39 UTC 2022
Still happening on Jammy with the following serial (uart) to usb
adapter:
Bus 001 Device 117: ID 0403:6001 Future Technology Devices
International, Ltd FT232 Serial (UART) IC
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0403 Future Technology Devices International, Ltd
idProduct 0x6001 FT232 Serial (UART) IC
bcdDevice 6.00
iManufacturer 1 FTDI
iProduct 2 FT232R USB UART
iSerial 3 A5XK3RJT
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0020
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 90mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 2 FT232R USB UART
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Device Status: 0x0000
(Bus Powered)
** Changed in: brltty (Ubuntu)
Status: Fix Released => New
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https://bugs.launchpad.net/bugs/874181
Title:
brltty daemon prevents creation of ttyUSB0 device link
Status in brltty package in Ubuntu:
New
Status in brltty source package in Oneiric:
Fix Released
Bug description:
Impact:
This bug is somewhat hardware specific, affecting all users of the USB serial controller, device 10c4:ea60.
Test case:
With the current version of brltty in Oneiric, brltty takes over any device using the above mentioned USB serial controller, whether it is a Braille display or not. This is because one of Brltty's supported displays uses this USB serial control internally for ocmmunication. The brltty package in oneiric-proposed has the udev rule for this controller commented out, allowing other users of devices based on this controller to work properly.
Regression potential:
All users of the supported Seika will have to load Brltty manually, as the udev rule for their device is commented out, to allow other USB serial controller users to use their device as a proper serial device.
Original description follows:
After upgrading from Ubuntu 11.04 to 11.10, I no longer found a
'/dev/ttyUSB0' for my serial-to-USB converter. The device is part of
a Xilinx FPGA board and is a "10c4:ea60 Cygnal Integrated Products,
Inc. CP210x Composite Device".
Every time I plugged in the device, dmesg showed the device coming up
and 'brltty' did *something* to it. At this point, no device was
present in '/dev'.
[ 5181.130942] cp210x 1-1.4:1.0: cp210x converter detected
[ 5181.203658] usb 1-1.4: reset full speed USB device number 5 using ehci_hcd
[ 5181.296637] usb 1-1.4: cp210x converter now attached to ttyUSB0
[ 5181.623749] usb 1-1.4: usbfs: interface 0 claimed by cp210x while 'brltty' sets config #1
After removing 'brltty', the '/dev/ttyUSB0' device appears again like
it used to.
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: brltty (not installed)
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Fri Oct 14 14:39:29 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
LANGUAGE=
LC_TIME=C
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: brltty
UpgradeStatus: Upgraded to oneiric on 2011-10-13 (0 days ago)
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