[kde] [Bug 411050] New: graphical brightness control does not read actual_brightness before changing it

[Teddy]

https://bugs.kde.org/show_bug.cgi?id=411050

            Bug ID: 411050
           Summary: graphical brightness control does not read
                    actual_brightness before changing it
           Product: kde
           Version: unspecified
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: reportbug at mailna.biz
  Target Milestone: ---

SUMMARY
If I change screen brightness using Fn+Up/Down, the progress bar on the toast
icon matches the current level of brightness, but if it's modified by console,
there can arise problems.

STEPS TO REPRODUCE
1. Start your system with 100% brightness, Fn+Up will display a full progress
bar
2. Change brightness from terminal like "echo 35 >
/sys/class/backlight/nvidia_0/brightness". The screen will dim automatically
3. Now try to increase the brightness using the hotkeys, with Fn+Up. You will
notice that the brightness doesn't increase and the progress bar is like at
100%

OBSERVED RESULT
KDE does not 'cat /sys/class/backlight/nvidia_0/actual_brightness' just before
each brightness change request, but instead relies on what value it should have
if I only had used hotkey.

EXPECTED RESULT
It should re-read the actual_brightness on each key combo, to see if there was
a brightness change in-between.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION

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