(fn+F2 and fn+F3) for brightness are not working

(fn+F2 and fn+F3) for brightness are not working, while the other function working properly... help me plz
DJanoon

What is the product number?
Did anything change before this started happening?
Power the system on and press F10 about once a second to get into BIOS.  Once you are in BIOS, go to the configuration tab (typically next to last tab) and set Action Keys to enabled.  Save the changes, exit, and the system should reboot automatically.  Test the brightness keys wihtout pressing the Fn key.  I suspect they will not work in this state, but I want to rule out the possibilities while awaiting the product number.
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