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SubjectRe: Linus' laptop and Num lock status
Linus Torvalds wrote:
>
> On Wed, 14 Feb 2007, Dax Kelson wrote:
>> Are there any technical or political reasons why kernel can't change
>> from "force off" to "Follow BIOS"?
>
> How would you query it? I'm not even 100% sure that you can on all
> keyboards. We never query the leds, we always set them. I think. I don't
> know of any AT kbd command to read the led state out of the keyboard.
>

You can query the state of the keyboard according to BIOS by looking in
byte 0x417 absolute, or by issuing int 0x16, ah = 0x02 (or ah = 0x12)
from real mode.

-hpa

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