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Old 11-03-2007, 02:03 AM   #1
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Registered: Sep 2007
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Unhappy Mouse problems when using a KVM.

I have an 8 port PS2 KVM connected to several of my Linux boxes, and I constantly have been having mouse related problems whenever I am running Xwindows and I switch away from a particular machine and then return to it. After doing so the mouse goes "wacky", jumping all over the screen and clicking at random. This occurs even if I exit X to a command line before switching machines. Once this happens the only way to correct the problem is to reboot the machine, just exiting and re-entering X windows has no effect. At first I decided to not allow the gpm daemon to start thinking that would allow me to avoid the problem, especially if I returned to a command line prior to switching machines, but this had no effect. I've also tried editing my xorg.conf file as per other posts on this forum to no avail.

Another interesting aspect of this problem is that even when I have not started a X session (starting up in run level 3) and as far as I can tell the gpm daemon isn't being launched, if I switch machines, I get the following error at the command line whenever the mouse is moved after I return.

psmouse.c: Explorer Mouse at isa0060/serio1/input0 lost synchronization, throwing 'n' bytes away. (where 'n' is 1, 2 or 3).

Any help on this would be appreciated, I have a couple of linux boxes running on this KVM, and they all exhibit this behavior or a variation of it. If any additional info is needed please don't hesitate to ask.

Thanks in advance,
Ah Clem

Here is some additional information on system configuration etc.

Error on console:
psmouse.c: Explorer Mouse at isa0060/serio1/input0 lost synchronization, throwing (1,2,3) bytes away.

uname -a output
Linux asterisk1.local 2.6.9-34.0.2.ELsmp #1 SMP Fri Jul 7 19:52:49 CDT 2006 i686 i686 i386 GNU/Linux

X -version output
X Window System Version 6.8.2
Release Date: 9 February 2005
X Protocol Version 11, Revision 0, Release 6.8.2
Build Operating System: Linux 2.6.9-42.0.3.ELsmp i686 [ELF]
Current Operating System: Linux asterisk1.local 2.6.9-34.0.2.ELsmp #1 SMP Fri Jul 7 19:52:49 CDT 2006 i686
Build Date: 19 September 2007
Build Host: builder6
Module Loader present
OS Kernel: Linux version 2.6.9-34.0.2.ELsmp (buildcentos@v20z-i386) (gcc version 3.4.5 20051201 (Red Hat 3.4.5-2)) #1 SMP Fri Jul 7 19:52:49 CDT 2006

Mouse section of xorg.conf:
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/mouse0"
Option "Emulate3Buttons" "off"
Option "ZAxisMapping" "4 5"
Old 11-03-2007, 06:27 AM   #2
Registered: Oct 2007
Location: Norway
Distribution: Slackware 14.1
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The problem sounds pretty weird. Would it work do rmmod psmouse and then modprobe it again?
Old 11-03-2007, 07:58 AM   #3
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Registered: Sep 2007
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Thanks but...

Tried "rmmod psmouse", it produced this error:
ERROR: Module psmouse does not exist in /proc/modules

Also tried "modprobe -r psmouse" which produced:
FATAL: Module psmouse not found.

"modprobe -l |grep mouse" shows the following:

Any other suggestions?

Ah clem


kvm, mouse

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