Impossible to get screenshot of fullscreen games

[Marco Trevisan (Treviño)]

[ Impact ]

When I screenshot (by pressing PrintScreen button) pretty much any game (non-game applications like Chromium or VLC don't have this issue) that renders in fullscreen (Vulkan or OpenGL), screenshots always come out completely blank and transparent.

[ Test case ]

Run a game full-screen, hit Print Screen to get a screenshot:
  - Expect the screenshot to be saved in the picture folders and to contain the game screen

[ Regression potential ]

Screenshots on X11 might cause a bit more resources and could be taken with some delay.

[Timo Aaltonen (tjaalton)]

Hello Marco, or anyone else affected,

Accepted gnome-shell into groovy-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/gnome-shell/3.38.2-1ubuntu1~20.10.1 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-groovy to verification-done-groovy. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-groovy. 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.

[Daniel van Vugt (vanvugt)]

Bug confirmed in gnome-shell 3.38.1-1ubuntu1.1 on groovy.

Fix verified in gnome-shell 3.38.2-1ubuntu1~20.10.1 on groovy. It now works.

[Chris Halse Rogers (raof)]

The verification of the Stable Release Update for gnome-shell 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.

[Launchpad Janitor (janitor)]

This bug was fixed in the package gnome-shell - 3.38.2-1ubuntu1~20.10.1

---------------
gnome-shell (3.38.2-1ubuntu1~20.10.1) groovy; urgency=medium

  * No-change backport to groovy
  * debian: Update gbp.conf and control references to groovy branching

gnome-shell (3.38.2-1ubuntu1) hirsute; urgency=medium

  * Merge with debian, containing new upstream release (LP: #1908161):
    - Fixed crash in meta_window_actor_thaw (LP: #1897765)
    - Fixed crash in st_bin_destroy (LP: #1898005)
  * debian/patches:
    - Refreshed
    - Revert-appDisplay-baseAppView-Cleanup-animate.patch:
      + Revert a 3.38.2 change that proved to cause regressions
    - screenshot-Grab-screenshot-during-paint-on-X11.patch:
      + Correctly take screenshots for fullscreen games (LP: #1908164)
  * Remaining changes with debian:
    - Replace gnome-backgrounds dep with ubuntu-wallpapers and Suggests
      gnome-themes-standard-data, gnome-backgrounds
    - Add some Recommends:
      + ubuntu-session (| gnome-session) to have the ubuntu session available
      + xserver-xorg-legacy
      + yaru-theme-gnome-shell for the default ubuntu theming
    - Update debian/gbp.conf with Ubuntu settings
    - gnome-shell-common.prerm: Remove deprecated ubuntu theme alternative
    - ubuntu/desktop_detect.patch:
      + add caching for desktop detection to avoid querying the current
        desktop env variable as iterate through the list each time. For the
        time of the Shell process, we can expect this env variable to stay
        stable.
    - ubuntu/smarter_alt_tab.patch:
      + quick alt-tab (without showing up the switcher) switch only between
        the last window of the last 2 applications to be focused instead of
        raising all windows of those apps.
    - ubuntu/lightdm-user-switching.patch:
      + Allow user switching when using LightDM.
    - ubuntu/lock_on_suspend.patch
      + Respect Ubuntu's lock-on-suspend setting.
    - ubuntu/background_login.patch
      + Change default background color as we modified the default GDM color
        for our ubuntu session.
    - ubuntu/gdm_alternatives.patch
      + Add support for GDM3 theme alternatives
    - optional-hot-corner.patch
      + enable patch proposed by upstream developer already in package (but
        not in series) to add a settings for optional hot corner activation.
    - main-show-an-error-message-on-gnome-shell-crash.patch,
      global-make-possible-to-set-debug-flags-dynamically.patch,
      main-increase-the-granularity-of-backtraces-in-SHELL_DEBU.patch,
      main-add-backtrace-crashes-all-and-backtrace-all.patch,
      sessionMode-add-support-for-debugFlags-parameter.patch:
      + Improve debug JS tracing for crash reports
    - st-scroll-view-Handle-the-case-where-scrollbars-are-NULL.patch:
      + Fix crash on theme changes
    - ubuntu/search-call-XUbuntuCancel-method-on-providers-when-no-dat.patch:
      + stop searches when requested from UI
    - magnifier-Show-cursor-when-magnifier-is-enabled-and-scale.patch:
      + Show monitor scaled cursor when magnifier is enabled
    - Break gnome-shell-extension-desktop-icons (<< 19.01.3+git20190814)

gnome-shell (3.38.2-1) unstable; urge...

[Daniel van Vugt (vanvugt)]

The fix appears to be in hirsute, as you would expect.