[dolphin] [Bug 490685] New: Starting Dolphin from Konsole causes computer to intermittently lag until Dolphin is closed

[Adam Fontenot]

https://bugs.kde.org/show_bug.cgi?id=490685

            Bug ID: 490685
           Summary: Starting Dolphin from Konsole causes computer to
                    intermittently lag until Dolphin is closed
    Classification: Applications
           Product: dolphin
           Version: 24.05.2
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: adam.m.fontenot+kde at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 171919
  --> https://bugs.kde.org/attachment.cgi?id=171919&action=edit
video of issue

SUMMARY

I thought for a while that my laptop had a serious issue, because I didn't
consider the possibility that a simple application like Dolphin could be
responsible. However it's 100% reproducible for me - at least right now.
Opening Dolphin to an empty directory from Konsole results in momentary hangs.

The specific hang might be happening in the KWin compositor - if I play a video
in VLC on a loop it appears to intermittently hang along with everything else.

Further debugging steps that might help isolate the issue would be appreciated.

STEPS TO REPRODUCE
1. Close all Konsole windows and open a new session.
1. In Konsole, make a new directory "~/Downloads/empty".
2. Open it with Dolphin directly, i.e. "dolphin ~/Downloads/empty".

(These steps are just intended to eliminate side effects. The directory I open
doesn't seem to matter.)

OBSERVED RESULT

Visible hangs every second or two (see attached video).

Using strace, Dolphin appears to be spamming a lot of syscalls. It seems to be
polling continually for something - I see a lot of `poll` and `clock_gettime`
calls. These go silent when Dolphin is in the background when it is launched
normally, but they are continuous when I launch it from Konsole.

I have seen the same issue before and I'm not sure if it always happened the
same way (i.e. starting Dolphin from Konsole) or not. I don't think I *always*
see the issue every time I start Dolphin from Konsole, but I'll double check
this next time I reboot.

EXPECTED RESULT

No lag.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.1.3
KDE Frameworks Version: 6.4.0
Qt Version: 6.7.2
Kernel Version: 6.9.10-arch1-1 (64-bit)
Graphics Platform: Wayland

I have Radeon graphics integrated into the laptop CPU. No Nvidia.

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