linux-kernel - Keyboard Stuttering

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Date:	Wed, 04 Oct 2006 13:15:29 -0500
From:	Frank Sorenson <frank@...rocks.com>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: Keyboard Stuttering

I'm experiencing some severe keyboard stuttering on my laptop.  The 
problem is particularly bad in X, and I believe it also occurs at the 
console, though I'm having a difficult time verifying that.  The problem 
  shows up as repeated characters (not regular key-repeat-related), and 
sometimes dropped key presses.

I'm running the 2.6.18 x86_64 kernel on a Core 2 Duo.

When I get the extra characters, each one shows under interrupt 1 for 
i8042 in /proc/interrupts, even when only one should show:
            CPU0       CPU1
   0:    4228511    4430136    IO-APIC-edge  timer
   1:       3666       3713    IO-APIC-edge  i8042
   8:          0          0    IO-APIC-edge  rtc
   9:          2          0   IO-APIC-level  acpi
  12:      89035      77993    IO-APIC-edge  i8042
  14:      19246       6894    IO-APIC-edge  libata
  15:      34998      22732    IO-APIC-edge  ide1
  17:       8456          0   IO-APIC-level  eth0
  18:          2          0   IO-APIC-level  ohci1394
  19:       4558       3872   IO-APIC-level  HDA Intel, uhci_hcd:usb3
  20:         23          0   IO-APIC-level  ehci_hcd:usb1, uhci_hcd:usb2
  21:          0          0   IO-APIC-level  uhci_hcd:usb4
  22:          0          0   IO-APIC-level  uhci_hcd:usb5
NMI:       1121        815
LOC:    8658522    8658062
ERR:          0

I have found that "nolapic" will make the keyboard work correctly (using 
XT-PIC), but obviously that has other negative side-effects (such as 
only one processor, etc.).  I've attached a dmesg of boot with a broken 
keyboard (without nolapic).

Has anyone experienced this problem before?  Is there a fix for this
keyboard stuttering?

TThhhaannkss,

Frrannk

View attachment "dmesg" of type "text/plain" (31425 bytes)