I have the same problem. It seems that it only appears when the network
interface receives an IPv6 address.
"sudo service network-manager restart" helps slightly, but not completely.
** (nm-applet:1438): WARNING **: Could not create object for
/org/freedesktop/NetworkManager/IP6Config/1838: Method "GetAll" with signature
"s" on interface "org.freed
esktop.DBus.Properties" doesn't exist
** (nm-applet:1438): WARNING **: Could not create object for
/org/freedesktop/NetworkManager/IP6Config/1923: Method "GetAll" with signature
"s" on interface "org.freed
esktop.DBus.Properties" doesn't exist
** Message: NM disappeared
** Message: NM appeared
** (nm-applet:1438): WARNING **: Could not create object for
/org/freedesktop/NetworkManager/IP6Config/7: Method "GetAll" with
signature "s" on interface "org.freedesktop.DBus.Properties" doesn't
exist
** (nm-applet:1438): WARNING **: Could not create object for
/org/freedesktop/NetworkManager/IP6Config/143: Method "GetAll" with
signature "s" on interface "org.freedesktop.DBus.Properties" doesn't
exist
...and so on.
After restarting NetworkManager is no longer occupies 50-100% CPU, but still
not 0.
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
23059 vk 20 0 943m 142m 20m S 8 4.7 0:11.36 chromium-browse
13465 root 20 0 255m 7456 4424 S 5 0.2 0:23.58 NetworkManager
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https://bugs.launchpad.net/bugs/987858
Title:
NM gobbles CPU and reports repeatedly to .xsession-errors: 'Could not
create object for /org/freedesktop/NetworkManager/IP6Config/<nnnn>:
Method "GetAll" ... doesn't exist'
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