Bug 430439 - Going to 0% brightness using the applet's slider doesn't turn off the backlight; 0% using keyboard actions does
Summary: Going to 0% brightness using the applet's slider doesn't turn off the backlig...
Status: RESOLVED FIXED
Alias: None
Product: Powerdevil
Classification: Plasma
Component: general (show other bugs)
Version: 5.20.4
Platform: Other Other
: NOR normal
Target Milestone: ---
Assignee: Plasma Bugs List
URL:
Keywords:
: 403125 445529 467910 (view as bug list)
Depends on:
Blocks:
 
Reported: 2020-12-15 17:54 UTC by postix
Modified: 2023-08-21 17:51 UTC (History)
10 users (show)

See Also:
Latest Commit: https://invent.kde.org/plasma/powerdevil/-/commit/e1e74f37ea6ba4d3450ae79ede25a7cac1dd9a84
Version Fixed In: 6.0

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Description postix 2020-12-15 17:54:58 UTC 
SUMMARY

There are to ways to change the brightness of the screen:
Fn + brightness keys or the energy plasmoid. 

For the first case it goes in steps of 5%:
100%, 95% ... 10% 5% OFF

The plasmoid's slider however is more fine graded and has a significant difference: 0% does not turn off the screen but dims it to the lowest level or to a level which is way below the 5%, which makes it very pleasant for the eyes in the night.

Turning off the screen is not possible here, though.

I'd like to propose to add an extra step for the "Fn + Brightness key" solution: 5% __0%__ OFF.



SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux
KDE Plasma Version: 5.20.4
KDE Frameworks Version: 5.76.0
Qt Version: 5.15.2
Kernel Version: 5.9.11-3-MANJARO
OS Type: 64-bit
Processors: 4 × Intel® Core™ i7-7500U CPU @ 2.70GHz
Memory: 15.4 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 620
Comment 1 Nowshed H. Imran 2020-12-16 15:17:08 UTC 
I can confirm this. Display shouldn't just turn blank. It can be like this,
5% then 1% then blank.
Comment 2 Nate Graham 2020-12-16 21:21:57 UTC 
It's true: setting the slider to 0% doesn't turn off the backlight the way going down to 0% using the keyboard actions does.
Comment 3 Martino Fontana 2022-06-19 22:34:58 UTC 
Testing right now, the Fn keys and the plasmoid have the same behavior: neither of them can turn off the screen.
Comment 4 dmatteo002 2023-04-21 16:30:20 UTC 
I've tested in Plasma 5.27.4 on Wayland and neither does seem to actually turn off the screen With the slider I got to 1% while dragging and 0% only with arrow key; instead with Fn + brightness keys I got to 0%; but in all the cases I could still see the content even if very faintly.
KDE Plasma 5.27.4
KDE frameworks Version: 5.105.0
Qt Version: 5.15.9
Kernel Version: 6.2.11-arch1-1 (64 bit)
Graphics Platform: Wayland
Comment 5 Natalie Clarius 2023-08-13 18:47:46 UTC 
*** Bug 445529 has been marked as a duplicate of this bug. ***
Comment 6 Natalie Clarius 2023-08-13 18:51:47 UTC 
Fixed with https://invent.kde.org/plasma/powerdevil/-/merge_requests/184; now the decrease key will no longer turn the screen off and instad  cap it at the same minimum brightness as the slider in the battery applet already does.
Comment 7 Nate Graham 2023-08-13 19:10:11 UTC 
*** Bug 467910 has been marked as a duplicate of this bug. ***
Comment 8 Nate Graham 2023-08-21 17:50:17 UTC 
*** Bug 403125 has been marked as a duplicate of this bug. ***