| Summary: | Brightness in KScreen KCM may not quite match the value shown in the Brightness and Color widget | ||
|---|---|---|---|
| Product: | [Applications] systemsettings | Reporter: | madness742 |
| Component: | kcm_kscreen | Assignee: | kscreen-bugs-null <kscreen-bugs-null> |
| Status: | RESOLVED FIXED | ||
| Severity: | minor | CC: | nate, plasma-bugs, xaver.hugl |
| Priority: | NOR | ||
| Version First Reported In: | 6.4.0 | ||
| Target Milestone: | --- | ||
| Platform: | Fedora RPMs | ||
| OS: | Linux | ||
| Latest Commit: | https://invent.kde.org/plasma/kscreen/-/commit/ecc9f70d857fcbc651a090905b54731855172049 | Version Fixed In: | 6.4.2 |
| Sentry Crash Report: | |||
| Attachments: |
Showcase of the brightness mismatch.
Showcase of the manually entering value bug. |
||
Created attachment 182378 [details]
Showcase of the manually entering value bug.
The percentage symbol gets swapped around, and there doesn't seem to be a character limit.
I can reproduce this mismatch. Probably the two calculations round off the returned value in slightly different ways. A possibly relevant merge request was started @ https://invent.kde.org/plasma/kscreen/-/merge_requests/407 Git commit 414a6c7877cdcc3f26e679fedf98b43ea572613b by Xaver Hugl. Committed on 26/06/2025 at 12:20. Pushed by zamundaaa into branch 'master'. kcm: round brightness value Otherwise, slight floating point differences can change the value M +2 -2 kcm/ui/OutputPanel.qml https://invent.kde.org/plasma/kscreen/-/commit/414a6c7877cdcc3f26e679fedf98b43ea572613b Git commit 0a9f419957252c93e9f7a73622086ad9441e1b57 by Xaver Hugl, on behalf of Xaver Hugl. Committed on 26/06/2025 at 15:56. Pushed by zamundaaa into branch 'Plasma/6.4'. kcm: round brightness value Otherwise, slight floating point differences can change the value (cherry picked from commit 414a6c7877cdcc3f26e679fedf98b43ea572613b) Co-authored-by: Xaver Hugl <xaver.hugl@kde.org> M +2 -2 kcm/ui/OutputPanel.qml https://invent.kde.org/plasma/kscreen/-/commit/0a9f419957252c93e9f7a73622086ad9441e1b57 Git commit ecc9f70d857fcbc651a090905b54731855172049 by Xaver Hugl, on behalf of Xaver Hugl. Committed on 26/06/2025 at 15:57. Pushed by zamundaaa into branch 'Plasma/6.3'. kcm: round brightness value Otherwise, slight floating point differences can change the value (cherry picked from commit 414a6c7877cdcc3f26e679fedf98b43ea572613b) Co-authored-by: Xaver Hugl <xaver.hugl@kde.org> M +2 -2 kcm/ui/OutputPanel.qml https://invent.kde.org/plasma/kscreen/-/commit/ecc9f70d857fcbc651a090905b54731855172049 |
Created attachment 182377 [details] Showcase of the brightness mismatch. SUMMARY When trying to set the monitor brightness to 57% (Without DDC/CI), it changes it to 56% after applying the change. STEPS TO REPRODUCE 1. Under System Settings -> Display Configuration, disable "Control hardware brightness with DDC/CI". 2. Set brightness to 57% in either system settings, or by using the Brightness & Colour Applet. OBSERVED RESULT The brightness under System Settings -> Display Configuration will be set to 56%, but the Brightness & Colour Applet shows 57%. EXPECTED RESULT It should display 57% under System Settings -> Display Configuration. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Fedora Linux 42 KDE Plasma Version: 6.4.0 KDE Frameworks Version: 6.15.0 Qt Version: 6.9.1 ADDITIONAL INFORMATION - Entering a value manually under System Settings -> Display Configuration -> Brightness is also buggy. It either doesn't work sometimes, or it switches up the "%" symbol around.