Bug 508982

SUMMARY
Screen brightness sometimes updates automatically (without user input). When this happens, the system seems to think the brightness is still at 100%, even though the actual brightness is lower. As a result, pressing the "increase brightness" key has no effect.

STEPS TO REPRODUCE
1. Set brightness to 100% (using keyboard shortcut or brightness slider).
2. Wait until the system automatically lowers brightness (not triggered by user).
3. Try to increase brightness again using the keyboard shortcut.

OBSERVED RESULT
Brightness does not increase because the system still thinks it is at 100%.
The only workaround is to first lower brightness (e.g., to 95%) and then raise it again to 100%.

EXPECTED RESULT
The brightness should increase to the actual maximum brightness when requested, even after automatic adjustments.

SOFTWARE/OS VERSIONS
- KDE Plasma: 6.4.4
- KDE Frameworks: 6.4.4
- Qt Version: 6.9.1
- Kernel: 6.16.1-arch1-1
- Distribution: Arch Linux (x86_64)

HARDWARE
- Laptop model: LG Gram 16Z90P (Intel i7-1165G7)
- GPU: Intel TigerLake-LP GT2 [Iris Xe Graphics] (i915 driver)

ADDITIONAL INFORMATION
It seems that the automatic brightness process does not update the internal brightness state variable correctly, causing the UI to believe it is still at 100%. This results in the system refusing to increase brightness above the incorrectly assumed maximum.