ubuntu-sdk-bugs team mailing list archive

[Elvis Stansvik <elvstone@xxxxxxxxx>]

Public bug reported:

A fix for QTBUG-40889 was worked out and submitted at

    https://codereview.qt-project.org/#/c/115531/

but due to coming in a bit late, was moved to Qt 5.6

    https://codereview.qt-project.org/#/c/126136/

The bug is about mouse motion event compression malfunctioning, and it
has grave consequences for some applications, where the flood of events
make rendering sluggish (e.g. anything based on VTK, but probably
others).

ParaView developer Ben Boeckel has tried the patch [2] against 5.5 and
confirmed it fixes rendering/interaction in VTK applications.

It is not possible to work around the bug at the application level in a
satisfactory way, only by resorting to timer-based rendering.

I suggest an SRU to patch the Ubuntu Qt package with the patch that was
originally meant for the 5.x branch (first URL above). The patch was
later integrated in 5.6 where it has been well tested.

[1] https://bugreports.qt.io/browse/QTBUG-40889
[2] http://vtk.1045678.n5.nabble.com/Delayed-mouse-interaction-due-to-event-loop-bug-in-Qt5-tp5730474p5732870.html

** Affects: qtbase-opensource-src (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  A fix for QTBUG-40889 was worked out and submitted at
  
-     https://codereview.qt-project.org/#/c/115531/
+     https://codereview.qt-project.org/#/c/115531/
  
  but due to coming in a bit late, was moved to Qt 5.6
  
-     https://codereview.qt-project.org/#/c/126136/
+     https://codereview.qt-project.org/#/c/126136/
  
  The bug is about mouse motion event compression malfunctioning, and it
  has grave consequences for some applications, where the flood of events
  make rendering sluggish (e.g. anything based on VTK, but probably
  others).
  
- ParaView developer Ben Boeckel has tried the patch [2] and confirm it
- fixes rendering/interaction in VTK applications.
+ ParaView developer Ben Boeckel has tried the patch [2] against 5.5 and
+ confirmed it fixes rendering/interaction in VTK applications.
  
  It is not possible to work around the bug at the application level in a
  satisfactory way, only by resorting to timer-based rendering.
  
  I suggest an SRU to patch the Ubuntu Qt package with the patch that was
  originally meant for the 5.x branch (first URL above). The patch was
  later integrated in 5.6 where it has been well tested.
  
  [1] https://bugreports.qt.io/browse/QTBUG-40889
  [2] http://vtk.1045678.n5.nabble.com/Delayed-mouse-interaction-due-to-event-loop-bug-in-Qt5-tp5730474p5732870.html

-- 
You received this bug notification because you are a member of Ubuntu
SDK bug tracking, which is subscribed to qtbase-opensource-src in
Ubuntu.
https://bugs.launchpad.net/bugs/1598173

Title:
  Please consider SRU of "xcb: Compress mouse motion and touch update
  events"

Status in qtbase-opensource-src package in Ubuntu:
  New

Bug description:
  A fix for QTBUG-40889 was worked out and submitted at

      https://codereview.qt-project.org/#/c/115531/

  but due to coming in a bit late, was moved to Qt 5.6

      https://codereview.qt-project.org/#/c/126136/

  The bug is about mouse motion event compression malfunctioning, and it
  has grave consequences for some applications, where the flood of
  events make rendering sluggish (e.g. anything based on VTK, but
  probably others).

  ParaView developer Ben Boeckel has tried the patch [2] against 5.5 and
  confirmed it fixes rendering/interaction in VTK applications.

  It is not possible to work around the bug at the application level in
  a satisfactory way, only by resorting to timer-based rendering.

  I suggest an SRU to patch the Ubuntu Qt package with the patch that
  was originally meant for the 5.x branch (first URL above). The patch
  was later integrated in 5.6 where it has been well tested.

  [1] https://bugreports.qt.io/browse/QTBUG-40889
  [2] http://vtk.1045678.n5.nabble.com/Delayed-mouse-interaction-due-to-event-loop-bug-in-Qt5-tp5730474p5732870.html

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