https://bugs.kde.org/show_bug.cgi?id=501510
Bug ID: 501510
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: 6.3.2
Platform: Fedora RPMs
URL: https://discuss.kde.org/t/disable-kde-monitor-brightne
ss-control/25134/16?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 179401
--> https://bugs.kde.org/attachment.cgi?id=179401&action=edit
A Screenshot of the Plasmoid
SUMMARY
Ater invoking "ddcutil getvcp 10", I see, verbatim, the undermentioned 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 4 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, which had both modifications applied.
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
KInfo returns the undermentioned 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
> Graphics Processor 1: AMD Radeon RX 5700
> Graphics Processor 2: AMD Radeon Graphics
ADDITIONAL INFORMATION
DDCUtil's "detect" command returns the undermentioned 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
Additionally, this replaces https://bugs.kde.org/show_bug.cgi?id=501354#c4.
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