Scaling problem with Qt apps

Bug #1834333 reported by Ali Fakhamati
This bug affects 1 person
Affects Status Importance Assigned to Milestone
qtbase-opensource-src (Ubuntu)
Fix Released

Bug Description

I have problem with scaling for Qt apps.
when i open Kolourpaint scaling is too small
i have Ubuntu 18.04 and install from snap and apt
i first report to and they tell me to report here

Kolourpaint its not only app with problem , anydesk , filezilla , pylon viewer , dukto , stacer , vmware horizon

Tags: hidpi qt scaling
Revision history for this message
Sebastien Bacher (seb128) wrote :

Thank you for your bug report, that should be sent upstream on

Changed in gnome-control-center (Ubuntu):
importance: Undecided → Low
status: New → Invalid
Revision history for this message
Daniel van Vugt (vanvugt) wrote :

This may be relate to bug 1824753

affects: gnome-control-center (Ubuntu) → qtbase-opensource-src (Ubuntu)
Changed in qtbase-opensource-src (Ubuntu):
status: Invalid → New
Revision history for this message
Dmitry Shachnev (mitya57) wrote :

This should be fixed by, which will be included in Qt 5.12.5.

Changed in qtbase-opensource-src (Ubuntu):
status: New → In Progress
Revision history for this message
Ali Fakhamati (fakhamatia) wrote :

How can u use this?

Revision history for this message
Dmitry Shachnev (mitya57) wrote :

It is an upstream fix that is not yet released. Note that the bug status is “In progress”.

Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package qtbase-opensource-src - 5.12.4+dfsg-4ubuntu1

qtbase-opensource-src (5.12.4+dfsg-4ubuntu1) eoan; urgency=medium

  * Backport two patches from upstream 5.12.5 release:
    - Use Xft DPI as basis for HiDPI scaling (LP: #1834333).
    - Fix crash when closing floating QDialogs, by reverting a breaking
      change from 5.12.4 release.
  * Update symbols files from the current build logs.

 -- Dmitry Shachnev <email address hidden> Thu, 03 Oct 2019 11:59:59 +0300

Changed in qtbase-opensource-src (Ubuntu):
status: In Progress → Fix Released
To post a comment you must log in.
This report contains Public information  
Everyone can see this information.

Other bug subscribers

Remote bug watches

Bug watches keep track of this bug in other bug trackers.