https://bugs.kde.org/show_bug.cgi?id=513365
Bug ID: 513365
Summary: KDE 6.4.5 on AMD 4800U: 50% brightness triggers
blackscreen via XF86BrightnessDown
Classification: Plasma
Product: kwin
Version First 6.4.5
Reported In:
Platform: Kubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: input
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: ---
SUMMARY
Lenovo Xiaoxin Air15 (AMD 4800U) KDE 6.4.5: 50% brightness +
XF86MonBrightnessDown triggers temp blackscreen (X11/Wayland)
STEPS TO REPRODUCE
1. Adjust the laptop’s built-in display brightness to exactly 50%
2. Press the XF86MonBrightnessDown hardware shortcut (backlight decrease key)
3. (Optional) Press XF86MonBrightnessUp to test display recovery
OBSERVED RESULT
The display immediately goes black temporarily when Step 2 is executed. The
screen only recovers after pressing XF86MonBrightnessUp (backlight increase
key).
This issue occurs regardless of whether the brightness shortcut is mapped in
KDE’s global shortcut settings, and is reproducible in both X11 and Wayland
Plasma sessions. Stopping the PowerDevil service does not resolve the bug.
EXPECTED RESULT
The display brightness should decrease normally from 50% to a lower level
without any blackscreen or display interruption, with no need for manual
recovery via the brightness-up key.
SOFTWARE/OS VERSIONS
Operating System: Kubuntu 25.10
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.2
Kernel Version: 6.17.0-8-generic (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 4800U with Radeon Graphics
Memory: 16 GiB of RAM (15.0 GiB usable)
Graphics Processor: AMD Radeon Graphics
Manufacturer: LENOVO
Product Name: 82GL
System Version: Lenovo XiaoXinAir 15ARE 2021
ADDITIONAL INFORMATION
Hardware: Lenovo Xiaoxin Air15 2021 (Ryzen Edition), AMD Ryzen7 4800U
(integrated Radeon Graphics), single built-in laptop display
Platform: The bug does not occur in GNOME desktop (kubuntu 25.10) or Windows
11 on the same hardware
--
You are receiving this mail because:
You are watching all bug changes.
