Messages in this thread | | | Date | Thu, 15 Feb 2007 06:25:00 -0800 | From | "H. Peter Anvin" <> | Subject | Re: Linus' laptop and Num lock status |
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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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