Re: i8042 problem

[Andries Brouwer <aebr@win.tue.nl>]

On Sat, Jul 26, 2003 at 02:11:36AM -0400, Pete Zaitcev wrote:

> On my old laptop, i8042 refuses to work with 2.6.0-test1-bk2.
> After a reboot, keyboard is dead. Hooking external keyboard
> revives the internal keyboard. Here's the dmesg with DEBUG:
> 
> drivers/input/serio/i8042.c: 60 -> i8042 (command) [50]
> drivers/input/serio/i8042.c: 44 -> i8042 (parameter) [50]
> drivers/input/serio/i8042.c: fa <- i8042 (interrupt, kbd, 1) [51]
> serio: i8042 KBD port at 0x60,0x64 irq 1
>  <------------- This is it, keyboard is dead.

Writing 44 to the command byte disables IRQ1.
(Otherwise the only remarkable part was that no reaction came to
f2 - identify keyboard.)

>  V---- Trying to hook external keyboard now
> drivers/input/serio/i8042.c: f0 -> i8042 (kbd-data) [109846]
> drivers/input/serio/i8042.c: fa <- i8042 (interrupt, kbd, 1) [109852]
> drivers/input/serio/i8042.c: 00 -> i8042 (kbd-data) [109873]
> drivers/input/serio/i8042.c: fa <- i8042 (interrupt, kbd, 1) [109879]
> drivers/input/serio/i8042.c: 41 <- i8042 (interrupt, kbd, 1) [109900]
> drivers/input/serio/i8042.c: 41 <- i8042 (interrupt, kbd, 1) [109921]
> atkbd.c: Unknown key (set 0, scancode 0x2, on isa0060/serio0) pressed.
> input: AT Set 2 keyboard on isa0060/serio0
>  <----- Now we are talking!

Funny. Looks like the "read scancode set" command got the scancode set
twice, and the second time was seen as unknown key.