keyboard + PS/2 mouse locks after opening psaux

From: Krzysztof Halasa (
Date: Tue Oct 09 2001 - 05:21:48 EST


I'm having the following problem: after I start X11 (or gpm with no X)
my keyboard and PS/2 mouse sometimes locks up. What could that be?

440BX UP celeron mobo here (Abit - BH6?), '94 AT keyboard, '2000 A4tech
2-wheel mouse, various Linux 2.4 versions (usually -ac, currently 2.4.10ac3).
I'm using NVidia Xserver module, but it doesn't seem related (the lookup
occured with no X while starting gpm once or twice).

If I kill Xserver (haven't tried with gpm), the keyboard (and mouse) start
working again (the next Xserver spawn works fine).

For me, it looks like some race condition between open_aux and mouse
(kbd?) interrupt, causing interrupts or kbd controller to stay disabled
after the mouse device is opened. The interrupt counters for both kbd
and psaux stay constant when I move the mouse and/or press buttons/keyboard

intrepid:~$ cat /proc/interrupts
  0: 1528212 XT-PIC timer
  1: 6 XT-PIC keyboard
  2: 0 XT-PIC cascade
  3: 189554 XT-PIC serial
  9: 1587447 XT-PIC acpi, nvidia
 11: 15215 XT-PIC usb-uhci, eth0, eth1
 12: 2 XT-PIC PS/2 Mouse
 14: 49181 XT-PIC ide0
 15: 1 XT-PIC ide1
NMI: 0
ERR: 3

I'm currently keeping this machine in locked state, so I can provide more

What I also found is that open_aux routine isn't protected by lock_kernel(),
while release_aux is. Is that correct? Would a mouse interrupt received
before open_aux() is completed cause such a lookup?

Krzysztof Halasa
Network Administrator
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This archive was generated by hypermail 2b29 : Mon Oct 15 2001 - 21:00:23 EST