Bug 391683 - Brightness 100% after screen locking
Summary: Brightness 100% after screen locking
Status: RESOLVED WORKSFORME
Alias: None
Product: Powerdevil
Classification: Plasma
Component: general (show other bugs)
Version: 5.12.3
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: Plasma Bugs List
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2018-03-10 21:26 UTC by Yves Glodt
Modified: 2018-04-15 21:27 UTC (History)
4 users (show)

See Also:
Latest Commit:
Version Fixed In:


Attachments
System settings (22.38 KB, image/png)
2018-03-10 21:26 UTC, Yves Glodt
Details
Energy saving settings (72.09 KB, image/png)
2018-03-13 18:35 UTC, Yves Glodt
Details

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Description Yves Glodt 2018-03-10 21:26:48 UTC
Created attachment 111304 [details]
System settings

I have a dual-screen setup. A laptop plus an external Dell 24" 1920*1200 hdmi screen.

I use Fedora 27 with the latest Plasma (5.12.3) and Frameworks (5.44).

When the screen locks due to the timeout of 5 minutes, the brightness comes back to 100%, even it was set to a much lower value before.

To correct the brightness after a lock, I usually hover the battery icon, and mouse-wheel-down until I get my usual brightness value.

This issue has been happening for a long time already.
Comment 1 Yves Glodt 2018-03-10 21:29:00 UTC
Note that the too-high brightness issue happens only after unlocking.
While locked the screen is black.
Comment 2 Nate Graham 2018-03-11 21:59:18 UTC
Can't reproduce with any lock method (timeout, keyboard shortcut, button in Kickoff, etc,), a single screen in 5.12.3 and Kubuntu 17.10. with all brightness checkboxes in Powerdevil checked. Does this issue reproduce when you don't have your external screen connected?
Comment 3 Yves Glodt 2018-03-13 18:35:07 UTC
Created attachment 111377 [details]
Energy saving settings
Comment 4 Yves Glodt 2018-03-13 18:38:23 UTC
Yes I can.

I just tried the following:

* Disabled my external screen in the Display configuration
* Brightness set (through the battery applet) to minimum
* Set the times to 1 minute (see attached screenshot)


Then I waited one minute, and the laptop screen turned black.

When I moved the mouse, it turned back on, on 100% brightness.

The brightness slider on the battery though still stays on minimum. I just move it right a bit, and then only it applies the acutal value of the slider.
Comment 5 Nate Graham 2018-03-16 04:13:58 UTC
Is minimum screen brightness on AC power a setting that actually makes sense, or is that just to test the bug? Does it reproduce with something other than minimum brightness?
Comment 6 Yves Glodt 2018-03-20 20:50:43 UTC
Any brightness higher than the minimum value is too bright for me, that's why I set it to minimum.

I just tried setting the slider one step higher than the minimum and so far the unwanted change to full brightness did not happen.

p.s.
I have two laptops. On one (running Fedora 27), the minimum value (slider full to the left) for brightness results in "medium bright", and on the other one (Fedora 28), it results in a black laptop screen.

The external screen is not influenced by the slider in the plasma planel.
Comment 7 Christoph Feck 2018-03-30 21:50:06 UTC
Thanks for the update; changing status.
Comment 8 Yves Glodt 2018-04-15 20:07:17 UTC
Note that I have a new laptop now which I installed Fedora 28 on, and the issue seems to be gone.

Whether it's the new hardware or the new distro which solved it, I don't know...

Maybe it's time to close th report.
Comment 9 David Edmundson 2018-04-15 21:27:08 UTC
Ok, I don't think we can procede without a user with the bug. 
Hopefully if it is a KDE issue it will be followed up elsewhere.