Disabling fractional scaling after selecting another integer scaling may unselect user choice

[Marco Trevisan (Treviño)]

[ Impact ]

If selecting another integer scaling after disabling fractional scaling

[ Test case ]

When running Ubuntu session under X11, in gnome-control-center, display panel:
 - Ensure 100% scaling is selected and applied
 - Enable fractional scaling
 - Select 200% scaling (or bigger integer scaling)
   - Green "Apply" button should be visible and clickable
 - Deactivate fractional scaling
   - Green "Apply" button stays and fractional scaling isn't disabled until applied

Repeat with inverted scaling orders (applying 200% and then selecting 100%)

Currently, once another integer value is selected, we just deselect the user choice and restore the previous one, deactivating the fractional scaling promtply.

[ Regression potential ]

- Displays are wrongly disposed and configured when fractional scaling is enabled
- Configurations are not applicable.

[Brian Murray (brian-murray)]

Hello Marco, or anyone else affected,

Accepted gnome-control-center into focal-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/gnome-control-center/1:3.36.4-0ubuntu2 in a few hours, and then in the -proposed repository.

Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed-focal to verification-done-focal. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-focal. In either case, without details of your testing we will not be able to proceed.

Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Sebastien Bacher (seb128)]

The 1:3.36.4-0ubuntu2 update works as documented

[Launchpad Janitor (janitor)]

This bug was fixed in the package gnome-control-center - 1:3.36.4-0ubuntu2

---------------
gnome-control-center (1:3.36.4-0ubuntu2) focal; urgency=medium

  * debian/patches/git_useraccount_segfault.patch:
    - don't segfault trying to get the user initials when accountsservice
      is not responding (lp: #1873378)
  * debian/patches/git_row_collide.patch:
    - backport a fix for items of the connection details colliding
      (lp: #1873184)

  [ Hui Wang ]
  * d/p/0033-sound-update-the-profile-list-after-getting-the-sign.patch
    - signal to update profile combo list after the PA changes the
      active profile, this patch fixes the empty profile combo list issue
      after selecting the hdmi/dp audio in the g-c-c. (LP: #1896919)

  [ Marco Trevisan (Treviño) ]
  * d/p/0008-Allow-tweaking-some-settings-for-Ubuntu-Dock.patch:
    - Don't try to fetch monitors if the config manager is not ready yet
    (lp: #1887731)
  * d/p/0019-display-Support-UI-scaled-logical-monitor-mode.patch,
    d/p/0024-display-Allow-fractional-scaling-to-be-enabled.patch:
    - Don't disable fractional scaling immediately on integer changes
    (lp: #1887707)

 -- Sebastien Bacher <email address hidden> Thu, 24 Sep 2020 17:03:01 +0200

[Łukasz Zemczak (sil2100)]

The verification of the Stable Release Update for gnome-control-center has completed successfully and the package is now being released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.