[Bug 1958224] Re: brltty claiming cp210x devices on 22.04

[Samuel thibault]

> it's a bit unclear to me which entries there should be considered
'generic USB IDs'?

They are marked "Generic Identifier", that's

0403:6001
10C4:EA60
10C4:EA80

> I also don't understand why those rules are debian specific

See the diff between ./debian/brltty-udeb.udev.rules and
./Autostart/Udev/device.rules.in

Note that in debian we use the udev rules *only* inside the installer.
The current strategy in Debian is that in the installer we use udev
rules to autodetect braille devices. But in the installed system we
don't: when the user installs brltty, the user means that they have a
Braille device and want to probe it, whether it uses a generic USB ID or
not, i.e. we always start brltty

> How does upstream handle the devices?

When brltty is started it just always probes all devices. Its udev rules
file always starts brltty, be it generic IDs or not.

> We should stop installing brltty by default going forward

That would align with the way it happens in Debian yes.

Ideally the udev rules would be split so that the non-generic pieces get
always installed to start brltty, and the generic pieces are installed
only when necessary. That's a matter of actually spending time on
implementing it.

> we aren't going to respin ISOs on old serie for such changes and that
wouldn't be a solution for already installed systems...

Yes, rather disable the generic udev rules.

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to brltty in Ubuntu.
https://bugs.launchpad.net/bugs/1958224

Title:
  brltty claiming cp210x devices on 22.04

Status in brltty package in Ubuntu:
  Confirmed

Bug description:
  Distributor ID:	Ubuntu
  Description:	Ubuntu Jammy Jellyfish (development branch)
  Release:	22.04
  Codename:	jammy
  brltty:  Installed: 6.4-2ubuntu1

   brltty appears once again to be claiming cp210x devices with the
  vendor/product ID of:

  idVendor=10c4, idProduct=ea60

  Example dmesg output:
    999.215968] usb 3-6.3: New USB device found, idVendor=10c4, idProduct=ea60, bcdDevice= 1.00
  [  999.215973] usb 3-6.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
  [  999.215975] usb 3-6.3: Product: CP2103 USB to UART Bridge
  [  999.215977] usb 3-6.3: Manufacturer: Silicon Labs
  [  999.215978] usb 3-6.3: SerialNumber: 0005
  [  999.234070] usbcore: registered new interface driver usbserial_generic
  [  999.234081] usbserial: USB Serial support registered for generic
  [  999.235262] usbcore: registered new interface driver cp210x
  [  999.235272] usbserial: USB Serial support registered for cp210x
  [  999.235298] cp210x 3-6.3:1.0: cp210x converter detected
  [  999.237039] usb 3-6.3: cp210x converter now attached to ttyUSB0
  [  999.300049] input: PC Speaker as /devices/platform/pcspkr/input/input41
  [  999.807223] input: BRLTTY 6.4 Linux Screen Driver Keyboard as /devices/virtual/input/input42
  [  999.991926] usb 3-6.3: usbfs: interface 0 claimed by cp210x while 'brltty' sets config #1
  [  999.995045] cp210x ttyUSB0: cp210x converter now disconnected from ttyUSB0
  [  999.995066] cp210x 3-6.3:1.0: device disconnected

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/brltty/+bug/1958224/+subscriptions