Hi,

when locking the screen under Plasma 6 X11, it causes huge CPU loads.

The upstream bug is https://bugs.kde.org/show_bug.cgi?id=484323.

The issue was identified to be in qt6-base and has been fixed in Qt 6.8.4 and 6.9.2.

We believe that the bug you reported is fixed in the latest version of
qt6-base, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1111957@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Patrick Franz <deltaone@debian.org> (supplier of updated qt6-base package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sun, 24 Aug 2025 13:11:15 +0200
Source: qt6-base
Architecture: source
Version: 6.8.2+dfsg-10
Distribution: unstable
Urgency: medium
Maintainer: Debian Qt/KDE Maintainers <debian-qt-kde@lists.debian.org>
Changed-By: Patrick Franz <deltaone@debian.org>
Closes: 1111957
Changes:
 qt6-base (6.8.2+dfsg-10) unstable; urgency=medium
 .
   [ Patrick Franz ]
   * Backport patch to fix high CPU load of kwin_x11 when locking the
     screen (Closes: #1111957).
Checksums-Sha1:
 1dbb25a8237b61ca69207202208da51451959fae 5376 qt6-base_6.8.2+dfsg-10.dsc
 1de0ee49237464660ff81b7d5d159d11f838e9f3 197620 qt6-base_6.8.2+dfsg-10.debian.tar.xz
 0792d8e85c6344943e0dc636ddc186ef683a9f67 7557 qt6-base_6.8.2+dfsg-10_source.buildinfo
Checksums-Sha256:
 ba1e5f871365f7fd414144181d492de19059dbfc96fc608c76ba9df70e54beae 5376 qt6-base_6.8.2+dfsg-10.dsc
 778c73f470efc6e3ab1c1fd7b16bb0c7a87601a698d0d08e84c4b90630d6213d 197620 qt6-base_6.8.2+dfsg-10.debian.tar.xz
 fd5e2d3d0709509a9475eb538de84d3fe8bc52862cbd4f1392e7e9baa2e0d043 7557 qt6-base_6.8.2+dfsg-10_source.buildinfo
Files:
 1fcc4114a65ae6430985e7b4ffe4ec70 5376 libs optional qt6-base_6.8.2+dfsg-10.dsc
 89a542b086acb8a843c6c07342677fac 197620 libs optional qt6-base_6.8.2+dfsg-10.debian.tar.xz
 6a85163e7babcd44172c63cf8153afad 7557 libs optional qt6-base_6.8.2+dfsg-10_source.buildinfo
-----BEGIN PGP SIGNATURE-----

iQIzBAEBCgAdFiEEYodBXDR68cxZHu3Knp96YDB3/lYFAmiq+LYACgkQnp96YDB3
/laXow/6A9HeYm2bOt+55FA8hsNDY5C9RW6ZXlBFxZyr7wuPmCePW27PhGdBL4U/
vEHI8GgM7RXEi1uj3bFC0ysk8m8L29llhizhPSjsjL+fyqqTuTIaU9WXq50Yy9WD
36Gzxrm7kEv0pbv4JsYJTuVh+hxyuS6rktXxT0r0SKnknSR6DYZuMY29hVvo5hvv
aHbyagRyQmM5BEDGZwr/Qzw8QVCS093vPdV/0sYfFjWbPkyJvYcL9rsfm41SdUyU
i3v7FZ3pfRpv8i5e0Y+m2NrSvyMJXJBzwUHtTbtDje49qZipHyFYnPpzB2zJrWHu
0ssCgZOIlVn/1QxG4Jq4NZJzzts1IwPKwT3tOm4uYps0k/Bi5e0qVZWFt7WBQARA
r/ZIMuAtfcARgCpAcoosrvZmX0IPxEygFlJ6IV9allY1977pQb8GVjmeNISBrRkE
P7JG47dBSY/2i8n3lPH6U7BIr9jWw1sasRtuw+3Qu2bTgFOvQLFrUtgmkRXlG7Zs
epYH8D8tv0ItvXM19m6XSxVMJRNvcsbKiI6zOPxI76XF+holy8ySjsJI6Tq9trqf
HdyNTbnBWn+fdU/WD+xr32eXYKuBRnzQFN3y5UvtMGg7fpaEetcyxCcsj7bcBqD0
s1HrmNMfDiVa37O80GtoDFrrkxi20VvOwju8r7zEpwE+rUY34l8=
=BPHx
-----END PGP SIGNATURE-----