Bug 483040

Summary:	Brightness slider in System Tray is jumpy, especially if dragged continuously or scrolled
Product:	[Plasma] plasmashell	Reporter:	righn
Component:	Brightness and Color widget	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	jpetso, natalie_clarius, nate, oded, qydwhotmail
Priority:	NOR	Keywords:	qt6, usability
Version First Reported In:	6.0.1
Target Milestone:	1.0
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:	6.1.0
Sentry Crash Report:
Attachments:	Video of the issue

Description righn 2024-03-09 21:41:28 UTC

Created attachment 166831 [details]
Video of the issue

SUMMARY
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***

STEPS TO REPRODUCE
1. Try to change brightness in the System Tray
2. Then try to change brightness with FN keys

OBSERVED RESULT

Sometimes, if you increase brightness to 100% it might just jump back to let's say 80% or 70%. Or if you try to lower the brightness 0%, it might reduce gradually, like it's reducing brightness at 15 frames per second. But changing brightness with FN works perfectly.

EXPECTED RESULT

Brightness changes to what I desire, quickly and percentage not to jump around.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: EndeavourOS with Linux 6.7.9-arch1-1
(available in About System)
KDE Plasma Version: 6.0.1
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2

ADDITIONAL INFORMATION

I don't think this is an issue with Plasma 6, because I remember I had something similar on Plasma 5 on EndeavourOS and Nobara with KDE. But only now did I decide to try and report this, because I haven't found a solution.

I'll include a short video how it looks.

Comment 1 Nate Graham 2024-03-11 23:21:49 UTC

Can reproduce.

Comment 2 Fushan Wen 2024-03-14 15:23:38 UTC

Should be fixed in 6.1 with the ported dataengine

Comment 3 Bug Janitor Service 2024-03-29 03:46:55 UTC

Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!

Comment 4 Bug Janitor Service 2024-04-13 03:48:04 UTC

This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!

Comment 5 Jakob Petsovits 2024-07-02 08:26:39 UTC

(In reply to Fushan Wen from comment #2)
> Should be fixed in 6.1 with the ported dataengine

I haven't encountered this since the dataengine port went into 6.1. Also there's the extra fixes from Bug 470106, the latest of which went into Plasma 6.1.1. The brightness slider now seems snappy and not jumpy, so I think it's reasonable to mark this as fixed. Let us know if you still encounter any related issues.