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From: Onno Garms on 31 Jan 2008 03:29
Hello,

I have a problem to get a scroll wheel mouse working at my KVM switch.

After booting, the scroll wheel works. But when I switch to another
computer and then back to the first computer, the scroll wheel no
longer works (but other mouse functions do). When I unplug and replug
the mouse, it works again. Replugging the mouse after every switching
between computers is not an option though.

Hardware:
I am using Avocent SwitchView PC KVM-Switch.
The problem is independent of the particular mouse used. I tried
Logitec LX5 and a noname mouse.
Both mice are connected at PS/2 port through PS/2 to USB adapter.
The mouse works perfectly when connected to the PS/2 port directly
instead of the switch.

Software:
- Problem occurs in both SuSE 10.0 and SuSE 10.3.
- Data for SuSE 10.0:
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: SuSE Linux [ELF] SuSE
Current Operating System: Linux diden 2.6.13-15.18-smp #1 SMP Tue
Oct 2 17:36:20 UTC 2007 x86_64
- Data for SuSE 10.3:
X Window System Version 7.2.0
Release Date: Sun Jan 6 19:47:47 UTC 2008
X Protocol Version 11, Revision 0, Release 7.2
Build Operating System: openSUSE SUSE LINUX
Current Operating System: Linux niden 2.6.22.13-0.3-default #1 SMP
2007/11/19 15:02:58 UTC x86_64
Build Date: 06 January 2008
- Scroll wheel works perfectly under Windows, even after switching
back to first computer.

Mouse configuration in xorg.conf
Driver "mouse"
Identifier "Mouse[3]"
Option "Device" "/dev/input/mice"
Option "Name" "IMPS/2"
Option "Protocol" "imps/2"
Option "Vendor" "PS/2-Mouse"
Option "ZAxisMapping" "4 5"

Was configured through YaST. Changing the protocol to explorer ps/2 or
adding "Buttons" "5" does not change the behaviour.

I am not familiar enough with the Linux intrinsics to tell what's
going on. Is it possible that the KVM switch reports a mouse without
wheel while switched to another computer? And is it possible that when
switching, Linux detects that the mouse wheel disappears, but when
switching back it does not detect that the mouse wheel has come back?
Then how could I stop Linux from probing for the mouse wheel while
switched away or how could I force it to probe after switching back
(in another way then replugging)?

Onno

From: Chris Cox on 31 Jan 2008 15:38
On Wed, 2008-01-30 at 00:29 -0800, Onno Garms wrote:
> Hello,
>
> I have a problem to get a scroll wheel mouse working at my KVM switch.
>
> After booting, the scroll wheel works. But when I switch to another
> computer and then back to the first computer, the scroll wheel no
> longer works (but other mouse functions do). When I unplug and replug
> the mouse, it works again. Replugging the mouse after every switching
> between computers is not an option though.

my solution (I have an Avocent)...

On the kernel boot lines in grub menu.lst:

psmouse.proto=imps psmouse.resetafter=1

Then when I switch, I do a mouse button 1 down as the first thing
(hopefully it's somewhere safe... recommend running a screen saver)
and that should force a resync.

There's an experimental option for doing resync
psmouse.resync(something), but the addition is volatile (may go
away in future kernel releases).

The problem is with resyncing the mouse. Not sure how/when
Linux will deal with this. It's been a problem for a long time.

Hope that helps,
Chris


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