[kde] [Bug 444192] New: Crash when DisplayPort monitor connected

[René Serral]

https://bugs.kde.org/show_bug.cgi?id=444192

            Bug ID: 444192
           Summary: Crash when DisplayPort monitor connected
           Product: kde
           Version: unspecified
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: rserral at gmail.com
  Target Milestone: ---

SUMMARY
I just bought a Displayport Samsung monitor and when connecting it through
USB-C and DisplayLink on my Ubuntu 21.04 a really weird behavior happens. The
moment I connect the monitor KDE applications start to randomly crash and from
then they cannot be started anymore. Looking at the logs I can repeatedly
(around 3 million times!!) see the message:
[warn] epoll_wait: Bad file descriptor

I'm not able to see any other relevant log message.

The most strange issue is that if I disconnect the monitor or if I connect it
through regular HDMI the problem instantly disappears.

I don't really know if it's a plasma or displaylink bug. The problem does not
happen with other non plasma applications (chrome, firefox...)

I filed a bug on DisplayLink already without answer yet:
https://www.displaylink.org/forum/showthread.php?t=67936


Any hint what can be wrong?
No


STEPS TO REPRODUCE
1. Connect the monitor through displayport 
2. continue working as usual
3. observe crashes kontact, dolphin, systemsettings, ...

EXPECTED RESULT
No crashes and regular workflow

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.23 (but the behavior is the same in 5.21 and 5.22
My KUbuntu is 21.10 (but before upgrading, the problem was present in 21.04)

KDE Frameworks Version: 5.87, but with 5.86 was the same
Qt Version: 5.15.2

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