a collection of
free screen savers
for X11, macOS,
iOS and Android
by Jamie Zawinski
and many others.
If any part of the XScreenSaver collection appears to have a bug,
I need as much information as possible about what went wrong.
Please describe the problem in as much detail as you can.
I'll also need to know:
macOS, iOS and Android users:
- Which screen saver is it?
- What is the XScreenSaver version number?
- What is the macOS or iOS version number,
and/or iPhone/iPad model?
- Have you tried the latest version
of XScreenSaver to see if your bug is already fixed?
If using macOS, please do the following:
- Open Terminal.app;
- Type (paste) this, all on one line:
log show --last 7d --predicate
'processImagePath ENDSWITH "ScreenSaverEngine"'
- Mail me everything that was printed.
- If the "Library/Logs/CrashReporter"
or "Library/Logs/DiagnosticReports" folders
(under your home directory)
contains files for "ScreenSaverEngine" or
"System Preferences", include those as well.
If a particular option setting is making one of the screen
savers crash, you can reset the options to the default state by
deleting the corresponding file in
"Library/Preferences/ByHost/". The file name will begin
And finally, email your bug report to
Please try to give it a descriptive subject line!
A good subject would be something like
"dangerball stops spinning".
A bad subject would be "xscreensaver bug".