Comment 42 for bug 1958224

Concerning 1a86:7523, the udev rules file in ubuntu indeed seems to be missing the manufacturer filter:

debian/brltty.udev.rules says:
ENV{PRODUCT}=="1a86/7523/*", ENV{BRLTTY_BRAILLE_DRIVER}="bm", GOTO="brltty_usb_run"

while it should be:
ENV{PRODUCT}=="1a86/7523/*", ATTRS{idVendor}=="1a40", ATTRS{idProduct}=="0101", ENV{BRLTTY_BRAILLE_DRIVER}="bm", GOTO="brltty_usb_run"

This needs to be fixed in the various ubuntu brltty versions, starting from 6.4.

BTW, for 403/6001 I see there
Ubuntu disable those to avoid conflicts, https://launchpad.net/bugs/1958224
But the line with the manufacturer filter should *not* be disabled, it properly filters-in the producer of the Braille devices.