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I actually have tried many ways to correct this Perhaps I was able to correct it adding a

acpi_osi=Linux acpi_backlight=vendor

in the grub configuration file( in GRUB_CMDLINE_LINUX_DEFAULT="quiet splash") But after a day when i star my laptop another problem occured Guess what!! blank screen then i have to add nomodeset in grub in grub page. Then i see that all brightness control has lost(Empty folder in sys/class/backlight).....!!

What i am supposed to do? can u suggest some proprietary driver... For and graphic card My laptop is Asus VivoBook Ryzen 5 Quad Core having acpi_video

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Guys I actually solved the problem by installing amdgpu_pro released for ubuntu 20.04. Also it solved my blank screen problem after grub page .

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