pc_keyb: controller jammed (0xA7)

pc_keyb: controller jammed (0xA7)

[Thoralf Will]

Hello,

I didn't find any useful answer anywhere so far, hope it's ok to ask here.
I'm currently trying to get a 2.4.31 up and running on an IBM
BladeCenter HS20/8843. (base system is a stripped down RH9)

When booting the kernel the console is spammmed with:
   pc_keyb: controller jammed (0xA7)
But it seems there are no further consequences and the keyboard is
working. The only answer I've found is "disable usb legacy" in the BIOS
but that's no solution for me because there is no option to disable usb
legacy support and it wouldn't make any sense anyway because the
keyboard is an usb-device, so I really do need support for usb.

Is there a workaround? Is this an already known bug? Anything wrong on
my side?


Thanks,
Thoralf

Re: pc_keyb: controller jammed (0xA7)

[Pete Zaitcev]

On Thu, 14 Jul 2005 18:27:01 +0200, Thoralf Will <thoralf@cipsoft.com> wrote:

> I didn't find any useful answer anywhere so far, hope it's ok to ask here.
> I'm currently trying to get a 2.4.31 up and running on an IBM
> BladeCenter HS20/8843. (base system is a stripped down RH9)
> 
> When booting the kernel the console is spammmed with:
>    pc_keyb: controller jammed (0xA7)
> But it seems there are no further consequences and the keyboard is
> working.

I saw a patch for it by Brian Maly, and yes, it was for 2.4.x.
Maybe he can send you a rediff against current Marcelo's tree.

However, is there a reason you're running 2.4.31 in Summer of 2005?
Did you try 2.6, does that one do the same thing? It has a rather
different infrastructure with the serio.

-- Pete

Re: pc_keyb: controller jammed (0xA7)

[Thoralf Will]

Pete Zaitcev wrote:
> On Thu, 14 Jul 2005 18:27:01 +0200, Thoralf Will <thoralf@cipsoft.com> wrote:
> 
> 
>>I didn't find any useful answer anywhere so far, hope it's ok to ask here.
>>I'm currently trying to get a 2.4.31 up and running on an IBM
>>BladeCenter HS20/8843. (base system is a stripped down RH9)
>>
>>When booting the kernel the console is spammmed with:
>>   pc_keyb: controller jammed (0xA7)
>>But it seems there are no further consequences and the keyboard is
>>working.
> 
> 
> I saw a patch for it by Brian Maly, and yes, it was for 2.4.x.
> Maybe he can send you a rediff against current Marcelo's tree.
> 
> However, is there a reason you're running 2.4.31 in Summer of 2005?
> Did you try 2.6, does that one do the same thing? It has a rather
> different infrastructure with the serio.
> 
> -- Pete
> 

Meanwhile I've found the source of the problem. A simple change in
drivers/char/pc_keyb.c
line 73 did the trick.
- #define kbd_controller_present()        1
+ #define kbd_controller_present()        0

The only backdraw I've noticed so far is the problem that the kernel
won't work on servers with a ps/2 keyboard controller anymore (of
course) properly. But that's a minor issue.

We are still running 2.4 kernels because our application is incompatible
with the new thread library. A migration is already planned but that
takes time, alot of. I don't expect a migration to take place before the
end of the year, maybe even later.

Thoralf