Bug 488936

Summary:	Scrolling to Change Power Profile on Power Management Icon Takes a Lot of Scrolling
Product:	[Plasma] plasmashell	Reporter:	Eamonn Rea <eamonnrea>
Component:	Power and Battery widget	Assignee:	Plasma Bugs List <plasma-bugs>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	kde, me, natalie_clarius, nate
Priority:	NOR
Version:	6.1.0
Target Milestone:	1.0
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Eamonn Rea 2024-06-21 22:47:59 UTC

SUMMARY
I initially wrote this issue to report that the scrolling on the Power Management widget didn't work. However after messing for a few minutes I did actually discover that it works, it just takes a lot of scrolling to do so.

When hovering over the Power Management widget, you can scroll to change the power profile. However, this takes a lot of scrolling to do so. On my trackpad (which fwiw has scroll speed set to the slowest value) I have to do two full vertical scrolls to change the power profile; it is faster to open the widget and click the profile at that speed.

I did not try if a mouse scroll wheel requires as much scrolling.

Other Plasma widgets which allow you to scroll to interact with them, such as Volume, do not take nearly as much scrolling.

STEPS TO REPRODUCE
1. Hover over the Power Management widget
2. Scroll on it
3. it takes a lot of scrolling to change

OBSERVED RESULT
Power Management widget takes a lot of scrolling (two or more scrolls for me) to change the power profile, more than other Plasma widgets.

EXPECTED RESULT
Power Management should require the same amount of scrolling as other Plasma widgets.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.9.5 Linux Zen
KDE Plasma Version: 6.1.0
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.1

ADDITIONAL INFORMATION
Used a built-in laptop trackpad, did not try a mouse.

Comment 1 Nate Graham 2024-06-25 20:52:14 UTC

This is very likely an issue with something upstream, wither power-profiles-daemon, or your vendor-supplied system firmware: sometimes when you change the profile, it immediately changes back, and the UI is simply reflecting this bug. Very annoying for sure.

But how do you know? Try setting the profile with `powerprofilesctl set performance` and then run `powerprofilesctl` to see if the profile has been changed to performance mode. If it's still on balanced or power saver, it's an upstream bug. See for example: https://gitlab.freedesktop.org/upower/power-profiles-daemon/-/issues/106

That's been closed and locked though, traced to a firmware problem with the vendor-supplied firmware. If you find that it's an upstream bug, feel free to open a new one there, as yours may be something else.

Comment 2 Eamonn Rea 2024-06-25 21:34:33 UTC

> sometimes when you change the profile, it immediately changes back, and the UI is simply reflecting this bug. Very annoying for sure.

Even if the text on the tooltip itself never changes, but does change and stays correct if I keep scrolling?

Comment 3 Nate Graham 2024-06-26 20:24:10 UTC

Ok, I mis-diagnosed this, sorry. I can't reproduce the issue of touchpad scrolling to change the value being excessively... scrolly. Have you changed the default scroll speed at all? Does it reproduce in a new clean user account on the same machine?

Comment 4 Eamonn Rea 2024-06-26 21:36:17 UTC

I have changed the scroll speed, yes.I have it at the lowest setting (which is still a bit fast for my tastes).

I have not tried a new user account, but this one is pretty fresh (just over a week old).

If I do a "fling" gesture (not sure how to word it, sorry) where I swipe vertically with two fingers really fast it will pretty consistently actually change. But gradually scrolling like I would do for, say, volume, requires quite a lot of scrolling (usually two full scrolls).

Comment 5 Nate Graham 2024-06-26 22:29:53 UTC

Aha! Now I'm 99% sure this is Bug 470746.

Can you reset the scroll speed to normal and see if it goes away? If so, it's Bug 470746.

Comment 6 Eamonn Rea 2024-06-26 23:58:33 UTC

Yup, good catch! Turning the scroll speed back to default (as per Bug 470746, the 5th tick from the left on the slider) and the scroll events trigger properly.

It is worth noting that from what I have observed, all other scroll behaviour is fine, including those on other widgets such as the Volume widget. Scrolling on that changes the volume as expected, this seems to only impact Power Management. That doesn't mean it *isn't* Bug 470746 but it is an inconsistency in that this only appears to affect Power Management, at least in my case.

Comment 7 Nate Graham 2024-06-27 16:11:54 UTC

The power profile item has only three items and `snapMode: PlasmaComponents3.Slider.SnapAlways` set on it, which makes its behavior more "discrete" compared to other sliders that can be moved continuously.

Do you have keyboard brightness exposed in the widget? If so, try scrolling there too; I'm guessing it has the same problem.

Regardless, yeah, this is Bug 470746.

*** This bug has been marked as a duplicate of bug 470746 ***

Comment 8 Eamonn Rea 2024-06-27 22:39:35 UTC

> Do you have keyboard brightness exposed in the widget? If so, try scrolling there too; I'm guessing it has the same problem.

I can not, keyboard brightness is not exposed for any of my keyboards or devices (none of my laptops or external keyboards have their brightness show up in any software), it can only be controlled on the keyboards themselves.

But I appreciate the insight, I'm guessing other sliders either have a different snapMode or no snapMode. Took a look around plasma-desktop out of interest and didn't see a snapMode defined for what looked like volume-related slider QML :-) Interesting either way.

And yup, a duplicate of the bug mentioned.