Full screen videos suddenly change scale when using fractional scaling

[norberto]

firefox does not properly play full screen videos using fractional scale at 125%
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
DisplayManager: gdm3
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-03-29 (17 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200329)
NonfreeKernelModules: nvidia_modeset nvidia
Package: gnome-shell 3.36.1-5ubuntu1
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30
RelatedPackageVersions: mutter-common 3.36.1-3ubuntu1
Tags: focal
Uname: Linux 5.4.0-24-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True

[norberto (nes8219)]

i'm using ubuntu 20.04

[Sebastien Bacher (seb128)]

Thank you for taking the time to report this bug and help make Ubuntu better. Unfortunately, we cannot work on this bug because your description didn't include enough information. You may find it helpful to read 'How to report bugs effectively' http://www.chiark.greenend.org.uk/~sgtatham/bugs.html. We'd be grateful if you would then provide a more complete description of the problem.

We have instructions on debugging some types of problems at http://wiki.ubuntu.com/DebuggingProcedures.

At a minimum, we need:
1. The specific steps or actions you took that caused you to encounter the problem.
2. The behavior you expected.
3. The behavior you actually encountered (in as much detail as possible).

Thanks!

[norberto (nes8219)]

Usando escala fraccional al 125 % en un monitor con resolución 1080p . No
puedo ver videos a pantalla completa en firefox por de repente escala a 300
% . Algo similar ocurre con juegos de steam a pantalla completa. En
chromium no se producen errores.

El jue., 9 de abr. de 2020 10:40, Sebastien Bacher <email address hidden>
escribió:

> Thank you for taking the time to report this bug and help make Ubuntu
> better. Unfortunately, we cannot work on this bug because your
> description didn't include enough information. You may find it helpful
> to read 'How to report bugs effectively'
> http://www.chiark.greenend.org.uk/~sgtatham/bugs.html. We'd be grateful
> if you would then provide a more complete description of the problem.
>
> We have instructions on debugging some types of problems at
> http://wiki.ubuntu.com/DebuggingProcedures.
>
> At a minimum, we need:
> 1. The specific steps or actions you took that caused you to encounter the
> problem.
> 2. The behavior you expected.
> 3. The behavior you actually encountered (in as much detail as possible).
>
> Thanks!
>
> ** Changed in: gnome-shell (Ubuntu)
> Importance: Undecided => Low
>
> ** Changed in: gnome-shell (Ubuntu)
> Status: New => Incomplete
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1871849
>
> Title:
> firefox bug fractional scalling
>
> Status in gnome-shell package in Ubuntu:
> Incomplete
>
> Bug description:
> firefox does not properly play full screen videos using fractional
> scale at 125%
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1871849/+subscriptions
>

[Daniel van Vugt (vanvugt)]

Sounds like this was bug 1862081.

Please update your system:

  sudo apt update
  sudo apt full-upgrade

and if the problem still happens then run this command:

  apport-collect 1871849

[norberto (nes8219)]

El problema persiste

El mar., 14 de abr. de 2020 00:55, Daniel van Vugt <
<email address hidden>> escribió:

> *** This bug is a duplicate of bug 1862081 ***
> https://bugs.launchpad.net/bugs/1862081
>
> Sounds like this was bug 1862081.
>
> Please update your system:
>
> sudo apt update
> sudo apt full-upgrade
>
> and if the problem still happens then run this command:
>
> apport-collect 1871849
>
> ** Tags added: focal
>
> ** This bug has been marked a duplicate of bug 1862081
> Gnome resizes framebuffer when playing fullscreen video over and over
> again (when using X11 fractional scaling)
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1871849
>
> Title:
> firefox bug fractional scalling
>
> Status in gnome-shell package in Ubuntu:
> Incomplete
>
> Bug description:
> firefox does not properly play full screen videos using fractional
> scale at 125%
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1871849/+subscriptions
>

[norberto (nes8219)]

apport information

[norberto (nes8219)]

apport information

[norberto (nes8219)]

apport information

[norberto (nes8219)]

apport information

[norberto (nes8219)]

apport information

[norberto (nes8219)]

apport information

[Daniel van Vugt (vanvugt)]

I already thought of that. This doesn't seem to be a duplicate of bug 1862081 because the reporter already has that fix.

[Daniel van Vugt (vanvugt)]

norberto,

Please also log out and in again, or reboot. And verify the problem is still happening.

[norberto (nes8219)]

El problema persiste. También hay problemas al grabar la pantalla con
OBS.Toma una resolución de pantalla de 300%.

El lun., 20 de abr. de 2020 23:50, Daniel van Vugt <
<email address hidden>> escribió:

> norberto,
>
> Please also log out and in again, or reboot. And verify the problem is
> still happening.
>
> ** Changed in: gnome-shell (Ubuntu)
> Status: New => Incomplete
>
> ** Changed in: mutter (Ubuntu)
> Status: New => Incomplete
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1871849
>
> Title:
> Firefox does not properly play full screen videos using fractional
> scale at 125%
>
> Status in gnome-shell package in Ubuntu:
> Incomplete
> Status in mutter package in Ubuntu:
> Incomplete
>
> Bug description:
> firefox does not properly play full screen videos using fractional scale
> at 125%
> ---
> ProblemType: Bug
> ApportVersion: 2.20.11-0ubuntu27
> Architecture: amd64
> CasperMD5CheckResult: skip
> CurrentDesktop: ubuntu:GNOME
> DisplayManager: gdm3
> DistroRelease: Ubuntu 20.04
> InstallationDate: Installed on 2020-03-29 (17 days ago)
> InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64
> (20200329)
> NonfreeKernelModules: nvidia_modeset nvidia
> Package: gnome-shell 3.36.1-5ubuntu1
> PackageArchitecture: amd64
> ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30
> RelatedPackageVersions: mutter-common 3.36.1-3ubuntu1
> Tags: focal
> Uname: Linux 5.4.0-24-generic x86_64
> UpgradeStatus: No upgrade log present (probably fresh install)
> UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
> _MarkForUpload: True
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1871849/+subscriptions
>

[Daniel van Vugt (vanvugt)]

The problem with OBS is a different issue, and possibly not a bug at all. It's probably not realistic to modify all screen recording apps to understand Ubuntu's Xrandr scaling feature. If you would like to discuss it further then please open a new bug by running:

  ubuntu-bug obs-studio

[Daniel van Vugt (vanvugt)]

Maybe related to bug 1876172.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Marco Trevisan (Treviño) (3v1n0)]

Unfortunately, there's no other option than doing this or you'd loose the direct rendering performances, so this is an expected behavior.

What we could do is to be smarter at picking the scaling value for the monitor. And I've already started some work for this.

[Sebastian Astra (legol2)]

How can be this issue be expected behavior? Can't you just disable resizing for full screen applications when fractional scaling is enabled?

[Daniel van Vugt (vanvugt)]

Disabling fullscreen unredirection sounds like a good option.

[Sebastian Astra (legol2)]

Hello, do you have any updates on this matter?

[norberto (nes8219)]

No

El jue., 21 de may. de 2020 13:25, Sebastian Astra <
<email address hidden>> escribió:

> Hello, do you have any updates on this matter?
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1871849
>
> Title:
> Full screen videos suddenly change scale when using fractional scaling
>
> Status in mutter package in Ubuntu:
> Confirmed
>
> Bug description:
> firefox does not properly play full screen videos using fractional scale
> at 125%
> ---
> ProblemType: Bug
> ApportVersion: 2.20.11-0ubuntu27
> Architecture: amd64
> CasperMD5CheckResult: skip
> CurrentDesktop: ubuntu:GNOME
> DisplayManager: gdm3
> DistroRelease: Ubuntu 20.04
> InstallationDate: Installed on 2020-03-29 (17 days ago)
> InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64
> (20200329)
> NonfreeKernelModules: nvidia_modeset nvidia
> Package: gnome-shell 3.36.1-5ubuntu1
> PackageArchitecture: amd64
> ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30
> RelatedPackageVersions: mutter-common 3.36.1-3ubuntu1
> Tags: focal
> Uname: Linux 5.4.0-24-generic x86_64
> UpgradeStatus: No upgrade log present (probably fresh install)
> UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
> _MarkForUpload: True
>
> To manage notifications about this bug go to:
>
> https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1871849/+subscriptions
>

[Marco Trevisan (Treviño) (3v1n0)]

> Disabling fullscreen unredirection sounds like a good option.

Well, I was thinking about that, but it also causes slowdown in games and D-R videos, so while resizing the UI might be not optimal it also allows better performances in such scenarios.

[Sebastian Astra (legol2)]

Sounds pretty weird to me that lower performance in games is worse than not rescaling UI. I think that most of us use Ubuntu to work and everyday usage, not for games

[Marco Trevisan (Treviño) (3v1n0)]

I don't agree we shouldn't target games.

However, maybe we can maybe black-list some video players and browsers. Not sure that would break webgl though.

[Daniel van Vugt (vanvugt)]

For fullscreen apps that don't have an absolute scale it makes a lot of sense to treat those as native resolution, without any fractional scaling. Because their visual elements are measured as a fraction of the screen size, meaning they're scale-less. So giving the user the maximum resolution and the ability to unredirect for maximum performance makes the most sense.

[EVGENY (nikevist)]

I have the same problem using Davinci Resolve in fullscreen mode, as well as VLC. With two 27" 4K monitors it's impossible to use any other scaling factor except 150%.

Ubuntu 20.10
GNOME 3.38.1

[Mutlu Can YILMAZ (mtlcnylmz)]

This cause Steam, Dolphin and Lutris/Wine games not to cover all the screen/looks cropped. It also causes screens to go black. Moreover, multi-monitor settings also randomly change.