Ubuntu
update-manager package

High CPU after update-manager is finished, dialog still open

Bug #1691716 reported by WoodyEckelzone on 2017-05-18

This bug report is a duplicate of: Bug #1637180: "The computer needs to restart" dialog constantly eats CPU. Edit Remove

This bug affects 3 people

Affects		Status	Importance	Assigned to	Milestone
	update-manager (Ubuntu)	Confirmed	Undecided	Unassigned

Bug Description

After update-manager is finished updating the machine, a dialog is open `The software on this computer is up to date`

Until I manually close the dialog, CPU usage is high (causing fan activity on my laptop), on an idle laptop.

1073 root 20 0 327616 52508 21344 S 28,5 1,3 24:13.48 Xorg
7232 user 20 0 1144896 85272 36848 S 25,2 2,2 19:31.46 compiz
19863 user 30 10 793744 148616 78720 R 18,5 3,8 17:35.43 update-manager

I do wonder why the 3 processes take so much CPU usage, a simple dialog waiting for user input could do with less, I suppose.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: update-manager 1:16.04.6
ProcVersionSignature: Ubuntu 4.8.0-52.55~16.04.1-generic 4.8.17
Uname: Linux 4.8.0-52-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: Unity
Date: Thu May 18 11:45:39 2017
GsettingsChanges:
b'com.ubuntu.update-manager' b'show-details' b'true'
b'com.ubuntu.update-manager' b'window-height' b'691'
b'com.ubuntu.update-manager' b'first-run' b'false'
b'com.ubuntu.update-manager' b'window-width' b'754'
b'com.ubuntu.update-manager' b'launch-time' b'int64 1495095095'
InstallationDate: Installed on 2014-04-18 (1125 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
PackageArchitecture: all
SourcePackage: update-manager
UpgradeStatus: Upgraded to xenial on 2016-04-22 (390 days ago)

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Revision history for this message

WoodyEckelzone (bcr497) wrote on 2017-05-18:

Aptdaemon.txt Edit (5.5 KiB, text/plain; charset="utf-8")
CurrentDmesg.txt.txt Edit (252.3 KiB, text/plain; charset="utf-8")
Dependencies.txt Edit (15.2 KiB, text/plain; charset="utf-8")
DpkgHistoryLog.txt.txt Edit (16.5 KiB, text/plain; charset="utf-8")
DpkgTerminalLog.txt.txt Edit (102.2 KiB, text/plain; charset="utf-8")
JournalErrors.txt Edit (242.9 KiB, text/plain; charset="utf-8")
ProcEnviron.txt Edit (325 bytes, text/plain; charset="utf-8")

Revision history for this message

Launchpad Janitor (janitor) wrote on 2017-08-22:

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in update-manager (Ubuntu):
status:	New → Confirmed

Revision history for this message

Brain (brain) wrote on 2017-08-22:

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.