Created attachment 143576 [details]
brightness

SUMMARY
Brightness too low when using keyboard keys to decrease brightness to 0 percentage, the display appears as if is switched off. But when I use flashlight on display I can see display contents with very low brightness.
If I decrease the brightness to 0 percentage using slider in system tray then I can see the contents of display which is also very low brightness, but visible without flashlight.
When I checked the file "/sys/class/backlight/intel_backlight/brightness" while decreasing the brightness to 0 percentage, it's value is 1 when using system tray slider & it's value is 0 when using keyboard keys. Please see the attached video.

The problem is clear when using Dim screen after 5 minutes & switch off after 10 minutes, after 5 minutes the screen does not appear as dimmed but it appears as if it is switched off, but visible when using external lightning like flashlight on the screen.

***
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***


STEPS TO REPRODUCE
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OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.23
KDE Plasma Version: 5.23.3
KDE Frameworks Version: 5.87.0
Qt Version: 5.15.3
Kernel Version: 5.11.0-40-generic (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i3-5010U CPU @ 2.10GHz
Memory: 3.8 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 5500

ADDITIONAL INFORMATION