[Bug 259119] xfce4-screensaver causes Xfce desktop halt with scfb driver in FBSD 12.3-PRERELEASE

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259119

            Bug ID: 259119
           Summary: xfce4-screensaver causes Xfce desktop halt with scfb
                    driver in FBSD 12.3-PRERELEASE
           Product: Base System
           Version: 12.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: dpostolov@yandex.ru

Sorry for my bad English...

FreeBSD 12.3-PRERELEASE FreeBSD 12.3-PRERELEASE r370752 GENERIC  amd64

I have an Acer Aspire XC-895 (Intel Core i5-10400/UHD Graphics 630) computer.
In FreeBSD 12.3-PRERELEASE-amd64, the drm-fbsd12.0-kmod video driver does not
works (although it works for Intel NUC5PPYH, Intel NUC7PJYH for FBSD 12.3 and
drm-fbsd13-kmod video driver works for FBSD13 and Acer), so for Acer in 12.3
you have to use the scfb driver. And if I install FBSD 12.3-PRERELEASE-amd64
and Xfce 4.16 (plus xfce4-goodies with xfce4-screensaver) with 'pkg install'
and configure it then Xfce desktop halted when xfce4-screensaver starts (with
disabled Lock) and scfb driver.

The workaround: disable xfce4-screensaver and use xscreensaver then all OK in
scfb mode for Acer.

Also I test xfce4-screensaver with Intel NUC5PPYH and Intel NUC7PJYH and FBSD
12.3-PRERELEASE-amd64 and _drm-fbsd12.0-kmod_ then all OK with Xfce4 and
xfce4-screensaver.

Problem in combination with scfb video driver and when xfce4-screensaver starts
after pause then Xfce halted.

Is it possible to fix this problem for future FreeBSD 12.3-PRERELEASE or BETA?

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