Jerky kbd and mouse

[Jonathan Byrne]

This is a fairly minor annoyance (enough so that I haven't bothered to 
mention it before, but it's a slow day), but I'm using KDE from 
Universe  on Warty and about every 15 seconds the mouse cursor will 
blink out and immediately re-appear.

If this happens while the mouse is being used, it will cause a skip or 
jerk in the mouse action.

If I'm typing a letter at the exact moment the mouse cursor blinks, that 
letter will be  repeated, so the keyboard is also apparently involved 
in this.

I'm using a Logitech wireless keyboard and mouse.

This problem does not appear in Windows on this machine, and has not 
appeared in other Linux distros on this machinee.

I'm running Debian Sid at home with the exact same model of Logitech 
keyboard and mouse and the problem doesn't happen there either.

Nothing alarming appears in the X log, however, there are these unusual 
(I haven't seen them  on any other system, at least) messages, which 
unfortunately are not timestamped:

SetClientVersion: 0 8
SetGrabKeysState - disabled
SetGrabKeysState - enabled

Googling that hasn't given me anything conclusive.

The hardware is a Dell Optiplex, Intel mobo with I81x chipset.  Here's 
my XF86Config-4:

# XF86Config-4 (XFree86 X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, 
using
# values from the debconf database.
#
# Edit this file with caution, and see the XF86Config-4 manual page.
# (Type "man XF86Config-4" at the shell prompt.)
#
# This file is automatically updated on xserver-xfree86 package upgrades 
*only*
# if it has not been modified since the last upgrade of the 
xserver-xfree86
# package.
#
# If you have edited this file but would like it to be automatically 
updated
# again, run the following commands as root:
#
#   cp /etc/X11/XF86Config-4 /etc/X11/XF86Config-4.custom
#   md5sum /etc/X11/XF86Config-4 >/var/lib/xfree86/XF86Config-4.md5sum
#   dpkg-reconfigure xserver-xfree86

Section "Files"
	FontPath	"unix/:7100"			# local font server
	# if the local font server has problems, we can fall back on these
	FontPath	"/usr/lib/X11/fonts/misc"
	FontPath	"/usr/lib/X11/fonts/cyrillic"
	FontPath	"/usr/lib/X11/fonts/100dpi/:unscaled"
	FontPath	"/usr/lib/X11/fonts/75dpi/:unscaled"
	FontPath	"/usr/lib/X11/fonts/Type1"
	FontPath	"/usr/lib/X11/fonts/CID"
	FontPath	"/usr/lib/X11/fonts/Speedo"
	FontPath	"/usr/lib/X11/fonts/100dpi"
	FontPath	"/usr/lib/X11/fonts/75dpi"
        # paths to defoma fonts
	FontPath	"/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
	FontPath	"/var/lib/defoma/x-ttcidfont-conf.d/dirs/CID"
EndSection

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	"v4l"
	Load	"vbe"
	Load	"xtt"
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/input/mice"
	Option		"Protocol"		"ImPS/2"
	Option		"ZAxisMapping"		"4 5"
EndSection

Section "Device"
	Identifier	"Intel Corporation 82845G/GL[Brookdale-G]/GE Chipset 
Integrated Graphics Device"
	Driver		"i810"
	BusID		"PCI:0:2:0"
	VideoRam	32768
EndSection

Section "Monitor"
	Identifier	"DELL 1901FP"
	HorizSync	30-80
	VertRefresh	56-76
	Option		"DPMS"
EndSection

Section "Screen"
	Identifier	"Default Screen"
	Device		"Intel Corporation 82845G/GL[Brookdale-G]/GE Chipset Integrated 
Graphics Device"
	Monitor		"DELL 1901FP"
	DefaultDepth	24
	SubSection "Display"
		Depth		1
		Modes		"1280x1024"
	EndSubSection
	SubSection "Display"
		Depth		4
		Modes		"1280x1024"
	EndSubSection
	SubSection "Display"
		Depth		8
		Modes		"1280x1024"
	EndSubSection
	SubSection "Display"
		Depth		15
		Modes		"1280x1024"
	EndSubSection
	SubSection "Display"
		Depth		16
		Modes		"1280x1024"
	EndSubSection
	SubSection "Display"
		Depth		24
		Modes		"1280x1024"
	EndSubSection
EndSection

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

Section "DRI"
	Mode	0666
EndSection

Any ideas?

TIA,

Jonathan
-- 
Jonathan Byrne <jbyrne at frontbridge.com>
Lead Spam Analyst
FrontBridge Technologies, Inc. <http://www.frontbridge.com>

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