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[Bug 1480877] Re: Access points' "PropertiesChanged" dbus signals freeze UI on mobile devices

 

Here's my updated patch, the only difference is that it includes a
DBusConnection disconnect() call in the destructor for
QNetworkManagerInterfaceDeviceModem(), which I'd punted on for
expediency while testing earlier this week.

If doesn't include the IPv6 related fix, as this was fixed in NM
already.

Our plan is to get this into silo-026 ASAP for testing as a potential
hotfix along with the location-services match rules fixes.


** Patch added: "net-bearer-nm-disconnect-ap-signals4.patch"
   https://bugs.launchpad.net/ubuntu-rtm/+source/location-service/+bug/1480877/+attachment/4524946/+files/net-bearer-nm-disconnect-ap-signals4.patch

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https://bugs.launchpad.net/bugs/1480877

Title:
  Access points' "PropertiesChanged" dbus signals freeze UI on mobile
  devices

Status in Canonical System Image:
  Confirmed
Status in Unity 8:
  New
Status in dbus-cpp package in Ubuntu:
  In Progress
Status in indicator-network package in Ubuntu:
  Incomplete
Status in network-manager package in Ubuntu:
  Incomplete
Status in qtbase-opensource-src package in Ubuntu:
  In Progress
Status in buteo-syncfw package in Ubuntu RTM:
  New
Status in location-service package in Ubuntu RTM:
  In Progress
Status in maliit-framework package in Ubuntu RTM:
  New
Status in network-manager package in Ubuntu RTM:
  Incomplete
Status in sync-monitor package in Ubuntu RTM:
  New

Bug description:
  Krillin, rc-proposed, r83

  
  DESCRIPTION:
  I've been trying to track down the cause of the occasional UI freezes on my Krillin device, and I noticed that whenever the UI freezes for 2-4 seconds, I get a burst of "PropertiesChanged" signals in dbus-monitor

  Here's a log of what's shown in dbus-monitor:
  http://pastebin.ubuntu.com/11992322/

  I'd guess the problem is in the code that actually catches the signals
  and acts accordingly.

  HOW TO REPRODUCE: 
  1) Move to a place where many wifi hotspots are available
  2) Connect the device via USB and run "phablet-shell" and then "dbus-monitor"
  3) Use the device while keeping an eye on dbus-monitor output

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References