When I pass the Qt application to the secondary monitor the characters of the application increase

Bug #1824753 reported by Patrick on 2019-04-15
10
This bug affects 1 person
Affects Status Importance Assigned to Milestone
qtbase-opensource-src (Ubuntu)
Undecided
Unassigned
vlc (Ubuntu)
Undecided
Unassigned

Bug Description

Hi. I have recently installed Ubuntu 19.04 RC. Everything works fine except the Qt applications. I have two monitors and when I pass the Qt application to the secondary monitor the characters of the application increase. They happen to the traditionally installed Qt applications and to those installed with Flatpak and Snap. I leave you a video in which you can see the problem with the VLC application.
https://youtu.be/tEZJONsinU4
https://i.imgur.com/R7GubxF.png?fb
---
ProblemType: Bug
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 19.04
InstallationDate: Installed on 2019-04-14 (1 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190413.2)
NonfreeKernelModules: nvidia_modeset nvidia
Package: mutter 3.32.0+git20190410-1ubuntu1
PackageArchitecture: amd64
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.0.0-11.12-generic 5.0.6
Tags: disco
Uname: Linux 5.0.0-11-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True

Patrick (lordgault) on 2019-04-15
affects: gchildcare → mutter
Daniel van Vugt (vanvugt) wrote :

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:

apport-collect 1824753

When reporting bugs in the future please use apport by using 'ubuntu-bug' and the name of the package affected. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs.

affects: mutter → mutter (Ubuntu)
Changed in mutter (Ubuntu):
status: New → Incomplete
tags: added: disco
Changed in vlc (Ubuntu):
status: New → Incomplete
summary: - ubuntu-bug mutter
+ When I pass the Qt application to the secondary monitor the characters
+ of the application increase
Daniel van Vugt (vanvugt) wrote :

Also, please try downgrading to mutter version 3.32.0-1 by downloading *.deb from:

  https://launchpad.net/ubuntu/+source/mutter/3.32.0-1/+build/16489975

and then install them with:

  dpkg -i *.deb

Now reboot and tell us if that fixes the problem.

no longer affects: vlc (Ubuntu)

apport information

tags: added: apport-collected
description: updated

apport information

Patrick (lordgault) wrote :

I've updated Mutter as indicated. The problem is still there but it seems to have improved the resolution.
https://youtu.be/3-wFNodO8Qo

Daniel van Vugt (vanvugt) wrote :

OK, if you have successfully downgraded mutter then it looks like this problem existed before the introduction of xrandr-scaling. So that's good. But just to verify, please run:

  dpkg -l | grep mutter

And send us the output.

Changed in mutter (Ubuntu):
status: Incomplete → New
status: New → Incomplete
Changed in qtbase-opensource-src (Ubuntu):
status: New → Incomplete
Changed in vlc (Ubuntu):
status: New → Incomplete
tags: added: hidpi multimonitor
Patrick (lordgault) wrote :

patrick@patrick-pc:~$ dpkg -l | grep mutter
ii gir1.2-mutter-4:amd64 3.32.0+git20190410-1ubuntu1 amd64 GObject introspection data for Mutter
ii libmutter-4-0:amd64 3.32.0+git20190410-1ubuntu1 amd64 window manager library from the Mutter window manager
ii mutter 3.32.0-1 amd64 lightweight GTK+ window manager
ii mutter-common 3.32.0+git20190410-1ubuntu1 all shared files for the Mutter window manager
patrick@patrick-pc:~$

Daniel van Vugt (vanvugt) wrote :

Thanks. It appears you have not downgraded all the packages, only one of them. Please repeat the steps in comment #2, being sure to download and install all the .deb files.

Patrick (lordgault) wrote :

Now I do. Before I just updated mutter_3.32.0-1_amd64.deb.
I have updated all deb and the problem continues.

patrick@patrick-pc:~$ dpkg -l | grep mutter
ii gir1.2-mutter-4:amd64 3.32.0-1 amd64 GObject introspection data for Mutter
ii libmutter-4-0:amd64 3.32.0-1 amd64 window manager library from the Mutter window manager
iU libmutter-4-dev:amd64 3.32.0-1 amd64 Development files for the Mutter window manager
ii mutter 3.32.0-1 amd64 lightweight GTK+ window manager
ii mutter-common 3.32.0-1 all shared files for the Mutter window manager
patrick@patrick-pc:~$

Daniel van Vugt (vanvugt) wrote :

Thanks. The problem continuing is somewhat good news. It means this isn't some new regression in mutter.

Changed in qtbase-opensource-src (Ubuntu):
status: Incomplete → New
Changed in vlc (Ubuntu):
status: Incomplete → New
no longer affects: mutter (Ubuntu)

This bug talks about Qt applications and only gives vlc as example.

Changed in vlc (Ubuntu):
status: New → Invalid
Patrick (lordgault) wrote :

This bug is with all Qt applications. I used VLC to show it. And by the way, it happens with other distros that use GNOME 3.32.

Dmitry Shachnev (mitya57) wrote :

> And by the way, it happens with other distros that use GNOME 3.32.

Thanks for the info! Do you know if this is caused by GNOME upgrade (3.30 -> 3.32) or by Qt upgrade (5.11 -> 5.12)?

Do you have any links to bugs in other distros or upstream?

Patrick (lordgault) wrote :

I don't know if it's the GNOME 3.30 to 3.32 update or the Qt update. I know it happens with other distros because I tried Manjaro Gnome and it also suffers this bug. I left a message in the forums with another video https://forum.manjaro.org/t/gnome-two-monitors-and-qt-problems/83075

Dmitry Shachnev (mitya57) wrote :

Thanks for the video! Can you please file a bug upstream to <https://bugreports.qt.io>?

Patrick (lordgault) wrote :

My knowledge (of language and so on) is very basic, I am using a web translator. It is very difficult for me to advertise on the web <https://bugreports.qt.io>? If someone can or wants to do it I will be very grateful. I can provide as much information as required.
Thank you, greetings.

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