According to the Freedesktop link it's fixed.
** Changed in: dbus (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/812913
Title:
poor console performance if dbus-launch run with "--exit-with-session"
Status in dbus package in Ubuntu:
Fix Released
Bug description:
Running dbus-launch from the console results in very poor performance
(keyboard keys need to be held down for multiple seconds for an echo
of that character to appear on the console).
To recreate:
killall dbus-launch &>/dev/null
eval `dbus-launch --auto-syntax --exit-with-session`
start typing :-)
Note that the problem only occurs with "--exit-with-session": This
invocation is fine:
killall dbus-launch &>/dev/null
eval `dbus-launch --auto-syntax`
Problem appears to be related to function tools/dbus-
launch.c:kill_bus_when_session_ends() which is calling select(2)
followed by read(2) in an infinite loop (until the shell exits) for
all input the user types.
Poor performance observed in oneiric VM (kvm).
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/dbus/+bug/812913/+subscriptions
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