windows seem to scroll by themselves once in a while

[michael <linux@networkingnewsletter.org.uk>]

Folks - for a while I thought it was me but now I am sure that contents
of a window (eg email windows or xpdf windows) do indeed move, seemingly
of their own volition - an occasional jump to somewhere else in the
contents. I've not managed to convince myself there's no correlation
with my moving the mouse but am 99% convinced I don't mouse click at all
when such 'auto scrolls' occur...

I've searched DU archives but can't find any help (although my memory
thought it had seen something there once but just cannot find it now!)
so all help very welcome.

Details of my system are:

michael@ratty:~$ uname -a;cat /etc/apt/sources.list;lspci
Linux ratty 2.4.27-1-686-smp #1 SMP Wed Dec 1 19:50:17 JST 2004 i686
GNU/Linux
#deb file:///cdrom/ sarge main

deb http://ftp.uk.debian.org/debian/ testing main
deb-src http://ftp.uk.debian.org/debian/ testing main

deb http://security.debian.org/ testing/updates main contrib non-free
0000:00:00.0 Host bridge: Intel Corp. Server Memory Controller Hub (rev
0a)
0000:00:00.1 ff00: Intel Corp. Memory Controller Hub Error Reporting
Register (rev 0a)
0000:00:02.0 PCI bridge: Intel Corp. Memory Controller Hub PCI Express
Port A0 (rev 0a)
0000:00:03.0 PCI bridge: Intel Corp. Memory Controller Hub PCI Express
Port A1 (rev 0a)
0000:00:1c.0 PCI bridge: Intel Corp. 6300ESB 64-bit PCI-X Bridge (rev
02)
0000:00:1d.0 USB Controller: Intel Corp. 6300ESB USB Universal Host
Controller (rev 02)
0000:00:1d.1 USB Controller: Intel Corp. 6300ESB USB Universal Host
Controller (rev 02)
0000:00:1d.4 System peripheral: Intel Corp. 6300ESB Watchdog Timer (rev
02)
0000:00:1d.5 PIC: Intel Corp. 6300ESB I/O Advanced Programmable
Interrupt Controller (rev 02)
0000:00:1d.7 USB Controller: Intel Corp. 6300ESB USB2 Enhanced Host
Controller (rev 02)
0000:00:1e.0 PCI bridge: Intel Corp. 82801 PCI Bridge (rev 0a)
0000:00:1f.0 ISA bridge: Intel Corp. 6300ESB LPC Interface Controller
(rev 02)
0000:00:1f.1 IDE interface: Intel Corp. 6300ESB PATA Storage Controller
(rev 02)
0000:00:1f.2 IDE interface: Intel Corp. 6300ESB SATA Storage Controller
(rev 02)
0000:00:1f.3 SMBus: Intel Corp. 6300ESB SMBus Controller (rev 02)
0000:04:02.0 VGA compatible controller: ATI Technologies Inc Rage XL
(rev 27)
0000:04:03.0 Ethernet controller: Intel Corp. 82541GI/PI Gigabit
Ethernet Controller (rev 05)
0000:04:04.0 Multimedia audio controller: Creative Labs SB Audigy LS

What I'm not so sure about is the XF86 config file:
# XF86Config-4 (XFree86 X Window System server configuration file)
{snip}
Section "Module"
	Load	"GLcore"
	Load	"bitmap"
	Load	"dbe"
	Load	"ddc"
	Load	"dri"
	Load	"extmod"
	Load	"freetype"
	Load	"glx"
	Load	"int10"
	Load	"record"
	Load	"speedo"
	Load	"type1"
	Load	"vbe"
EndSection

Section "InputDevice"
	Identifier	"Generic Keyboard"
	Driver		"keyboard"
	Option		"CoreKeyboard"
	Option		"XkbRules"	"xfree86"
	Option		"XkbModel"	"pc104"
	Option		"XkbLayout"	"us"
EndSection

Section "InputDevice"
	Identifier	"Configured Mouse"
	Driver		"mouse"
	Option		"CorePointer"
	Option		"Device"		"/dev/psaux"
	Option		"Protocol"		"ImPS/2"
	Option		"Emulate3Buttons"	"true"
	Option		"ZAxisMapping"		"4 5"
EndSection
Section "InputDevice"
	Identifier	"Generic Mouse"
	Driver		"mouse"
	Option		"SendCoreEvents"	"true"
	Option		"Device"		"/dev/input/mice"
	Option		"Protocol"		"ImPS/2"
	Option		"Emulate3Buttons"	"true"
	Option		"ZAxisMapping"		"4 5"
EndSection

{snip}
Section "ServerLayout"
	Identifier	"Default Layout"
	Screen		"Default Screen"
	InputDevice	"Generic Keyboard"
	InputDevice	"Configured Mouse"
	InputDevice	"Generic Mouse"
EndSection

Section "DRI"
	Mode	0666
EndSection


Thanks!
-- 
Michael Bane
Atmospheric Physics Group
University of Manchester