Asus VivoBook 15 - Keyboard backlight off randomly

[yoonlim]

System: Windows 10 Home
Battery or AC: AC (battery mode not yet tested)
Model: K513EQ
Frequency of occurrence: Random
Reset OS: No
Screenshot or video: No
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Detailed description：
Keyboard backlight will off while inactive for around 1 min, move mouse or press keyboard to turn on the backlight ,sometime it will never turn on the backlight even after moving mouse or press keyboard, required toggle F7 to turn back on the backlight.

[Blake_ASUS]

Hello yoonlim,
May you check if your BIOS version is 205 and all your Windows update has been completed?
And may you record a short video of the issue?
Thank you.

[yoonlim]

Yes BIOS is 205, and all the windows updated has been completed.
The issue is similar to
https://zentalk.asus.com/en/discussion/37412/backlight-not-coming-back-on
https://zentalk.asus.com/en/discussion/comment/129299

Attached is the video link, Keyboard backlight will off while inactive for around 1 min, move mouse or press keyboard to turn on the backlight ,sometime it will never turn on the backlight even after moving mouse or press keyboard, required toggle F7 to turn back on the backlight.

[Blake_ASUS]

Hello yoonlim,
Does this issue happen in safe mode?
Windows 10 - How to enter Safe Mode? | Official Support | ASUS GlobalThank you.

[yoonlim]

Hi,
Entered safe mode the backlight does not work at all (including all the hot key).

Thanks