Bug 436069

Summary:	Session restore with no apps restored is much slower than new session mode
Product:	[Plasma] plasmashell	Reporter:	medin <med.medin.2014>
Component:	Session Management	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	kdedev, nate, plasma-bugs-null
Priority:	NOR
Version First Reported In:	5.21.4
Target Milestone:	1.0
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	log

Description medin 2021-04-23 00:14:35 UTC

After many times of testing I can confirm that Restore session mode with no apps opened is much slower than Empty new session, it's supposed to be the opposite but It doesn't work at all for me.


Operating System: Manjaro Linux
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.81.0
Qt Version: 5.15.2
Kernel Version: 5.4.112-1-MANJARO
OS Type: 64-bit
Graphics Platform: X11

Comment 1 David Edmundson 2021-04-23 17:41:13 UTC

Please confirm this happens for a new user. 

Please also provide a dbus-monitor --pcap log of the boot processs

Comment 2 medin 2021-04-23 21:21:51 UTC

(In reply to David Edmundson from comment #1)
> Please confirm this happens for a new user. 
> 
> Please also provide a dbus-monitor --pcap log of the boot processs

With new user both modes take the same time to boot to desktop, I think my current user is bloated somewhere, I don't know why it takes so much time to boot, maybe due to having some Akonadi apps like KAlarm, KMail (configured with  GMail), KNotes.
I did run dbus-monitor --pcap but it appends terminal output as long as I use other apps, I don't know how to run it correctly.

Comment 3 David Edmundson 2021-04-23 23:37:52 UTC

`dbus-monitor --pcap > /tmp/someLogFile &`

and run super early.



Both being slow makes some sense at least - we wait for apps to finish starting up if autostarted. We have had situations where autostart apps would claim to support statup notifications and then do a bad job of implementing them. 

going through the relevant autostarted app would help find that

Comment 4 medin 2021-04-24 14:24:14 UTC

Here's the result of dbus-monitor --pcap

Comment 5 medin 2021-04-24 14:24:41 UTC

Created attachment 137871 [details]
log

Comment 6 TraceyC 2025-04-09 22:34:34 UTC

Thanks for the bug report. I'm sorry we weren't able to get to this yet. There have been many fixes and improvements in Plasma 6, and this issue may have been fixed.

Can you please re-test on your system with Plasma 6.3.4 or later and let us know if you can still reproduce the problem? Thanks!

Comment 7 medin 2025-04-11 20:46:47 UTC

(In reply to TraceyC from comment #6)
> Thanks for the bug report. I'm sorry we weren't able to get to this yet.
> There have been many fixes and improvements in Plasma 6, and this issue may
> have been fixed.
> 
> Can you please re-test on your system with Plasma 6.3.4 or later and let us
> know if you can still reproduce the problem? Thanks!

I retested both modes  "On last logout" and "Start with an empty session" with reboot and logout, and measured the time with my phone stopwatch from SDDM to when it fully shows desktop icons, the results showed that both modes have quite similar consumed time.

The only note is that with reboot, both modes consumes a time x5 than what is needed for logging from a logout.