[Bug 1578435] [NEW] Excessive CPU consumption when asking whether to update

[Michi Henning]

Public bug reported:

Every now and then, I notice my laptop sitting there doing nothing with
the fans going full tilt. At those times, software updater shows me a
prompt asking whether I want to install updates. Top shows:

   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                            
 87294 michi     30  10  705080 131156  78876 S  18.1  3.3  32:02.85 update-manager                                     
  1148 root      20   0  452256 135468  33220 S  10.6  3.4  58:13.24 Xorg 

CPU consumption of update-manager is permanently around 20% while the
dialog is displayed (see attachment), and Xorg eats another 10% or so.
As soon as I dismiss the dialog, both update-manager and Xorg stop
eating CPU.

This is really nasty, especially when I'm running on batteries and one
of my VMs does this. The battery ends up empty in short order if the
relevant VM is off-screen and I don't notice the hiss from the fans when
I'm in a noisy environment.

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Software Updater.png"
   https://bugs.launchpad.net/bugs/1578435/+attachment/4656016/+files/Software%20Updater.png

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https://bugs.launchpad.net/bugs/1578435

Title:
  Excessive CPU consumption when asking whether to update

Status in update-manager package in Ubuntu:
  New

Bug description:
  Every now and then, I notice my laptop sitting there doing nothing
  with the fans going full tilt. At those times, software updater shows
  me a prompt asking whether I want to install updates. Top shows:

     PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND                                            
   87294 michi     30  10  705080 131156  78876 S  18.1  3.3  32:02.85 update-manager                                     
    1148 root      20   0  452256 135468  33220 S  10.6  3.4  58:13.24 Xorg 

  CPU consumption of update-manager is permanently around 20% while the
  dialog is displayed (see attachment), and Xorg eats another 10% or so.
  As soon as I dismiss the dialog, both update-manager and Xorg stop
  eating CPU.

  This is really nasty, especially when I'm running on batteries and one
  of my VMs does this. The battery ends up empty in short order if the
  relevant VM is off-screen and I don't notice the hiss from the fans
  when I'm in a noisy environment.

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