Issue:

/var/log/syslog shows a lot of

2024-02-04T00:08:31.821628-05:00 hogwarts kwin_x11[1679]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 48439, resource id: 25259764, major code: 14 (GetGeometry), minor code: 0

how to fix it?

% lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 12 (bookworm)
Release:        12
Codename:       bookworm

% date
Sun Feb  4 11:15:27 AM EST 2024

Do I have any obsolete qt packages?

rajulocal@hogwarts ~ % apt list "?obsolete" | grep qt
...
qml-module-qtquick-controls-styles-breeze/now 4:5.14.5-1 amd64 [installed,local]
qtcore4-l10n/now 4:4.8.7+dfsg-18+deb10u1 all [installed,local]

purged both qtcore4-l10n, qml-module-qtquick-controls-styles-breeze

How many obsolete packages are on my system at the moment?

rajulocal@hogwarts ~ % date
Sun Feb  4 12:05:22 PM EST 2024
rajulocal@hogwarts ~ % apt list -- '?obsolete' 2>/dev/null | wc -l
145

Todo: check if it fixed the problem.

/var/log/syslog still shows a lot of

2024-02-11T21:13:14.668404-05:00 hogwarts kwin_x11[1634]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 59688, resource id: 36780747, major code: 14 (GetGeometry), minor code: 0

Are there any obsolete packages installed?

% apt list "?obsolete" 2>/dev/null | wc -l
97

Removed a bunch of obsolete packages and got it down to

% apt list "?obsolete" 2>/dev/null | wc -l
80

Useful command

% apt list "?obsolete" 2>/dev/null | cut -f 1 -d '/' | popsort.py

Todo: check if it fixed the problem.

/var/log/syslog still shows a lot of

2024-02-14T00:24:42.925628-05:00 hogwarts kwin_x11[1630]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 65090, resource id: 25543376, major code: 14 (GetGeometry), minor code: 0

How many obsolete packages are installed?

% apt list "?obsolete" 2>/dev/null | wc -l
79

Identify some obsolete packages and delete them

apt list "?obsolete" 2>/dev/null | cut -f 1 -d '/' | popsort.py

Got the number of obsolete packages down to

 % apt list "?obsolete" 2>/dev/null | wc -l
48

Todo:- Check if the problem still exists.