https://bugs.kde.org/show_bug.cgi?id=501354
Bug ID: 501354
Summary: 100% brightness in the Brightness and Colour plasmoid
correlates to 30% brightness in the VCP firmware, and
this cannot be overridden.
Classification: Plasma
Product: plasmashell
Version: 6.2.5
Platform: Fedora RPMs
URL: https://discuss.kde.org/t/disable-kde-monitor-brightne
ss-control/25134/3?u=rokejulianlockhart
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Brightness and Color widget
Assignee: plasma-b...@kde.org
Reporter: 4wy78...@rokejulianlockhart.addy.io
CC: natalie_clar...@yahoo.de
Target Milestone: 1.0
Created attachment 179299
--> https://bugs.kde.org/attachment.cgi?id=179299&action=edit
A Screenshot of the Plasmoid
SUMMARY
-------
Ater invoking `ddcutil getvcp 10`, I see, verbatim:
> ~~~YAML
> VCP code 0x10 (Brightness ): current value = 30, max
> value = 100
> ~~~
However, as the attached screenshot depicts, the Brightness and Colour plasmoid
returns 100% for this value. Consequently, I am restricted to 30% brightness,
but *can* reduce it to 0%.
STEPS TO REPRODUCE
------------------
I don't know, because I don't know when this commenced. However, this OS
installation is barely 2 days old, and I've done little more to it than add
RPMFusion, and Mesa Freeworld from it. This did not reproduce on my previous
installation.
OBSERVED RESULT
---------------
100% in the plasmoid correlates to 30% brightness in the VCP firmware, and how
to rectify this isn't evident. Attempting to modify the brightness to > 30% via
`ddcutil setvcp 10 $int` momentarily applies that value before it is reverted.
The same occurs if set via the monitor's integrated VCP GUI (accessible via
physical buttons).
EXPECTED RESULT
---------------
100% in the plasmoid shouldn't correlate to 30% brightness in the VCP firmware.
It should correlate to 100%.
SOFTWARE/OS VERSIONS
--------------------
1. ~~~YAML
#!/usr/bin/env sh
kinfo
~~~
2. > ~~~YAML
> Operating System: Fedora Linux 41
> KDE Plasma Version: 6.3.2
> KDE Frameworks Version: 6.11.0
> Qt Version: 6.8.2
> Kernel Version: 6.13.5-200.fc41.x86_64 (64-bit)
> Graphics Platform: Wayland
> Processors: 12 × AMD Ryzen 5 7600X 6-Core Processor
> Memory: 30.4 GiB of RAM
> Graphics Processor 1: AMD Radeon RX 5700
> Graphics Processor 2: AMD Radeon Graphics
> ~~~
ADDITIONAL INFORMATION
----------------------
1. ~~~YAML
#!/usr/bin/env sh
ddcutil detect
~~~
2. > ~~~YAML
> Display 1
> I2C bus: /dev/i2c-8
> DRM connector: card1-DP-1
> EDID synopsis:
> Mfg id: AOC - UNK
> Model: Q3279WG5B
> Product code: 12921 (0x3279)
> Serial number:
> Binary serial number: 40899 (0x00009fc3)
> Manufacture year: 2019, Week: 51
> VCP version: 2.2
> ~~~
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