I can confirm exactly the same issue.
The Ubuntu Software Updater exhibits constant high CPU usage when the
final pop-up "The software on this computer is up to date. [ OK ]" is
shown after the updates have been performed.
Output of top:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1496 root 20 0 894152 337872 298496 S 13.3 2.1 5:15.88 Xorg
2462 brain 20 0 1577620 153740 71320 S 13.3 1.0 7:51.93 compiz
13959 brain 30 10 814320 210292 135388 S 13.3 1.3 1:44.40
update-manager
There is no reason for high CPU usage just to show a pop-up notification
with an OK button, waiting for user confirmation. It should not need any
CPU in an event driven system.
The high CPU usage disappears after clicking the OK button.
This is particularly a problem when running on battery. The pop-up
dialog usually ends up below other windows and the user doesn't notice
it. In the meantime it is heavily draining the battery.
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https://bugs.launchpad.net/bugs/1691716
Title:
High CPU after update-manager is finished, dialog still open
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