Messages in this thread | | | Date | Sun, 14 Jul 2002 19:32:36 +0200 | From | Vojtech Pavlik <> | Subject | Re: kbd not functioning in 2.5.25-dj2 |
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On Sun, Jul 14, 2002 at 03:36:20PM +0200, Rogier Wolff wrote:
> Vojtech Pavlik wrote: > > > > > mice: PS/2 mouse device common for all mice > > > > > atkbd.c: Sent: f5 > > > > > atkbd.c: Received fe > > > > > serio: i8042 KBD port at 0x60,0x64 irq 1 > [...] > > Responses: > > > > 0xfe > > Resend. Keyboard will send this if it didn't receive the last command > > correctly. > > > > Unfortunately, 0xfe also happens when you send a command to a keyboard > > that's not plugged, or when the keyboard doesn't understand the command. > > Resending in those cases (which are the most common) would cause an > > infinite loop ... > > Not if implemented correctly. > > Set the retry counter to 5 at the beginning. > > if you get 0xfe: decrement retry counter, > if 0 : > no keyboard connected. Give up. > else > Just immediately resend the last command > else > set the retry counter to 5 again. > process returned code
Yes. Sure. I knew someone will suggest that. :) The only problem is, I've never seen a keyboard sending 0xfe because it wants the command sent again. Under normal circumstances, there aren't bit errors on the cable.
-- Vojtech Pavlik SuSE Labs - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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