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Re:XSuspender Auto-suspend inactive X11 applications by 1kurac on Monday January 24, 2022 @11:36AM (#30059967)
What settings did you use for Slack, and did you, by chance, have `downclock_on_battery=` enabled?

https://github.com/kernc/xsuspender/blob/92ea5c6dfcb0f79eb10...

Re:XSuspender Auto-suspend inactive X11 applications by m0ngr31 on Monday January 24, 2022 @12:47PM (#30061135)
I did have that enabled, disabled it and still had the same issue.

[Slack]

match_wm_class_contains = slack

send_signals = false

IIRC, I still had issues with this setting