Keyboard is frozen on boot of 2.3.41

[Jeremy Fitzhardinge]

On 29-Jan-00 Linus Torvalds wrote:
> 
> 
> On Sat, 29 Jan 2000, Jeremy Fitzhardinge wrote:
>> 
>> I've had a problem with the keyboard/trackpad freezing with USB enabled on
>> my
>> Sharp Actius A100 laptop.
>> 
>> The problem is the PS/2 mouse driver is most unhappy about sharing its
>> interrupt with anything else.  It wants IRQ 12, and if the USB controller
>> also
>> gets IRQ 12 the keyboard (and mouse) locks up as soon as you touch the
>> mouse.
> 
> ok, this just confirms my theory. 
> 
> Mouse, USB and PCMCIA can easily all be on irq12 - it may not be the most
> common setup, but it is definitely _one_ common setup (another is having
> USB and PCMCIA share irq9).
> 
> And yes, USB and PCMCIA are the only drivers that are _likely_ to share
> the interrupt, so this also explains why problems like this are new. The
> keyboard/mouse driver didn't commonly use to care because it historically
> didn't get many "spurious" interrupts.
> 
> This might actually be an old lockup problem - there have always been
> reports of keyboards dying. It might just have been explained only now..
> 
> I don't see anything actually _wrong_ in the keyboard interrupt handler,
> though. That worries me. What we do to the mouse hardware is pretty much
> the same whether the mouse device is open or not, and the only real
> difference in opening the mouse is that it makes us save the events...
> 
> Oh. We do some mouse initialization at open too. That might be a problem,
> and that _does_ make a difference unlike the actual irq path.
> 
> In fact, in "aux_open()", could you people who see a problem try to
> disable the toshiba4030cdt workaround? Just #if 0 the send_data() code
> that sends a KBD_CMD_ENABLE thing to the keyboard, and see if that makes
> any difference? The shared interrupt thing may be a red herring, just a
> timing difference.

Didn't help.  What's even more odd, there's no interrupts recorded:

: abulafia:pts/0; cat /proc/interrupts 
           CPU0       
  0:      11745          XT-PIC  timer
  1:        116          XT-PIC  keyboard
  2:          0          XT-PIC  cascade
  3:        243          XT-PIC  pcnet_cs
  5:          1          XT-PIC  Crystal audio controller
  8:          1          XT-PIC  rtc
 12:          0          XT-PIC  usb-uhci, Ricoh Co Ltd RL5c475, PS/2 Mouse
 13:          1          XT-PIC  fpu
 14:       1758          XT-PIC  ide0
NMI:          0 
ERR:          0

Keyboard was functional when I booted the system and logged in.  As soon as I
touched the mouse, the keyboard and mouse locked up.  I can log in fine over
the net.

        J

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