> I tried to send smbios request with:
> 
> class=4
> selector=11
> arg1=64
> 
> (0x40 hex = 64 dec)
> 
> And it disabled keyboard backlight on my E6440 machine, then it set
> keyboard backlight inactivity timeout to 5 seconds and call returned:
> 
> Res1=-2
> 
> So this smbios query is not safe :-( as it set some keyboard backlight
> default values and return "error not supported".

What a shame. My Vostro V131 returns 0 in both Res1 and Res2, as
anticipated, without the ill effects you described.

> So are you sure that 4, 11, 64 is call correct? Or is above side-effect
> of setting keyboard backlight values expected?

I second these questions. And if the side effects Pali wrote about are
not expected, perhaps there is a well-known subset of devices this call
can be whitelisted or blacklisted on?

-- 
Best regards,
Michał Kępień
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