Bug 464754 - GUI ignores external change of kbd_backlight brightness
Summary: GUI ignores external change of kbd_backlight brightness
Status: RESOLVED UPSTREAM
Alias: None
Product: Powerdevil
Classification: Plasma
Component: general (show other bugs)
Version: 5.26.5
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: Plasma Bugs List
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2023-01-24 17:42 UTC by Werner Sembach [TUXEDO]
Modified: 2023-07-02 12:34 UTC (History)
5 users (show)

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Description Werner Sembach [TUXEDO] 2023-01-24 17:42:14 UTC 
SUMMARY
Changing keyboard backlight brightness from command line or another programm then powerdevil is not shown in the gui sliders in the kcm and the tray menu.


STEPS TO REPRODUCE
1. Change value of /sys/class/leds/*kbd_backlight* via command line

OBSERVED RESULT
The kbd_backlight sliders in the plasma gui are still on their old value

EXPECTED RESULT
The kbd_backlight sliders in the plasma gui detecht the change and adjust themselfs accordingly

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kernel 5.15/Plasma 5.26.5
Comment 1 Jose Roberto 2023-05-23 19:22:43 UTC 
I can confirm. Using ThinkPad T480 the keyboard backlight slide value is kept constant, even changing from external command.
Comment 2 Werner Sembach [TUXEDO] 2023-07-01 12:39:22 UTC 
So I now know more: KDE uses UPower (a DBus inteface) to determine and set brightness level and UPower does not monitor external changes to sysfs/brightness, so you need to adjustthe brightness using UPower and KDE will recognize it.