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Re: mouse suddenly behaving strangely



On Fri, Apr 23, 2004 at 03:33:54PM +0100, Dave Howorth wrote:
> Hello,
> 
> My mouse just started behaving strangely, although I haven't done 
> anything, to the best of my knowledge. Hopefully somebody will have an 
> idea what to try!
> 
> I was using my system (woody) as I have for the past many months when 
> the mouse suddenly froze. It's a Logitech cordless M-RN66, plugged in 
> via the PS/2 port.  I hadn't changed anything immediately prior to the 
> freeze, for that matter I haven't changed any system level things for 
> quite a while.
> 
> I rebooted into Windows 2000 and the mouse was frozen there too. I 
> switched to another mouse (corded PS/2 Logitech M-CAA43), pushing the 
> connector in and out a few times to clean it.  I booted into Windows 
> again and it appeared to work.  I rebooted into Debian and now have 
> weird behaviour. The pointer starts in the centre of the screen but as 
> soon as I start moving the mouse around it jumps to the bottom left. If 
> I move the mouse up and right, the pointer tracks up and right for a few 
> inches and then jumps back to the bottom left corner again.
> 
> Feels like a hardware problem to me - has anybody seen these symptoms 
> before?

It might be the X-doesn't-reset-the-mouse bug which tends to show up
in dual-boot situations. What happens is that X doesn't reset the
mouse before trying to initialise it. If it's already been initialised
by Windoze it then doesn't respond correctly to the initialisation
sequence that X sends it. To get it going again reset the mouse by hand:

- kill X
echo -ne '\377' > /dev/psaux
- restart X

-- 
Pigeon

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