I enabled systemd debug logging, with the following potentially interesting output.

Dec 06 14:14:37 jpw systemd[1]: [email protected]: Job 2022 [email protected]/start finished, result=done Dec 06 14:14:37 jpw systemd[1]: Started BRLTTY Instance: /dev/bus/usb/001/010. Dec 06 14:14:37 jpw systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1/unit/brltty_40_2ddev_2dbus_2dusb_2d001_2d010_2eservice interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=1053 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a Dec 06 14:14:37 jpw systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1/unit/brltty_40_2ddev_2dbus_2dusb_2d001_2d010_2eservice interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=1054 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a Dec 06 14:14:37 jpw systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=JobRemoved cookie=1055 reply_cookie=0 signature=uoss error-name=n/a error-message=n/a Dec 06 14:14:37 jpw systemd[1]: [email protected]: Unit is not needed anymore. Dec 06 14:14:37 jpw systemd[1]: [email protected]: Trying to enqueue job [email protected]/stop/fail Dec 06 14:14:37 jpw systemd[1]: Added job [email protected]/stop to transaction. Dec 06 14:14:37 jpw systemd[1]: [email protected]: Installed new job [email protected]/stop as 2097 Dec 06 14:14:37 jpw systemd[1]: [email protected]: Enqueued job [email protected]/stop as 2097 Dec 06 14:14:37 jpw systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1/unit/brltty_40_2ddev_2dbus_2dusb_2d001_2d010_2eservice interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=1056 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a Dec 06 14:14:37 jpw systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1/unit/brltty_40_2ddev_2dbus_2dusb_2d001_2d010_2eservice interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=1057 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a Dec 06 14:14:37 jpw systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1 interface=org.freedesktop.systemd1.Manager member=JobNew cookie=1058 reply_cookie=0 signature=uos error-name=n/a error-message=n/a Dec 06 14:14:37 jpw systemd[1]: [email protected]: About to execute /usr/lib/brltty/systemd-wrapper -C Dec 06 14:14:37 jpw systemd[1]: [email protected]: Forked /usr/lib/brltty/systemd-wrapper as 5489 Dec 06 14:14:37 jpw systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1/unit/brltty_40_2ddev_2dbus_2dusb_2d001_2d010_2eservice interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=1059 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a Dec 06 14:14:37 jpw systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/systemd1/unit/brltty_40_2ddev_2dbus_2dusb_2d001_2d010_2eservice interface=org.freedesktop.DBus.Properties member=PropertiesChanged cookie=1060 reply_cookie=0 signature=sa{sv}as error-name=n/a error-message=n/a Dec 06 14:14:37 jpw systemd[1]: [email protected]: Changed running -> stop Dec 06 14:14:37 jpw systemd[1]: Stopping BRLTTY Instance: /dev/bus/usb/001/010... Dec 06 14:14:37 jpw systemd[1]: Sent message type=signal sender=n/a destination=n/a path=/org/freedesktop/

On 12/6/20 1:57 PM, Alexander Epaneshnikov wrote:
06.12.2020 21:35, Dave Mielke пишет:
[quoted lines by Jason White on 2020/12/06 at 12:49 -0500]

I installed the package, with the same result, unfortunately.
Your udev rules look good. Is the kernel log showing a USB disconnect?

Alexander: Are you using the same version of systemd (247) that Jason is?

yep.

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