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whenever i install 64bit brightness stay at the lowest level and cant be changed

HP Recommended
Compaq 6735s
Ubuntu LTS

Operating System: Kubuntu 21.04
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2
Kernel Version: 5.11.0-22-generic
OS Type: 64-bit
Graphics Platform: X11
Processor: 1 × AMD Sempron(tm) SI-40
Memory: 2.7 GiB of RAM
Graphics Processor: AMD RS780

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