@Ergok
I reviewed your post and I understand that you want to keep the keyboard backlight always on.
Don’t worry, I assure you I will try my best to get this sorted.
If the blacklight stays on for only a few seconds, the backlight timeout setting might need configuring in the BIOS.
NOTE: If there is not a setting for the backlight timing in the BIOS, this behavior might not be supported on the notebook. Check your notebook model's product support documentation to confirm support.
Your BIOS version and screens might vary.
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Restart the notebook, and then immediately press the F10 repeatedly until the BIOS opens.
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When the BIOS opens, use the arrow keys to navigate to the Advanced tab.
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Navigate to Built-in Device Options, and then press Enter.

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In the Built-in Device Options, select Backlit keyboard timeout.
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Press the spacebar to open the keyboard backlight settings, and then select the timeout setting you want.
NOTE:
If you select Never, the backlight remains on which could quickly drain the notebook battery power.

Let me know how it goes and you have a great day!
P.S: Welcome to the HP Support Community 😊
If you wish to show appreciation for my efforts, mark my post as Accept as Solution. Your feedback counts!
Cheers!
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The_Fossette
I am an HP Employee