Re: [Qemu-devel] NT4 guest mouse failure under qemu 0.9.1

[Alexander Graf]

On May 24, 2008, at 2:02 PM, Mark Cave-Ayland wrote:

> Mark Cave-Ayland wrote:
> > Hi everyone,
> >
> > I've noticed another failure within our qemu 0.9.1 NT4 guest with
> > relation to the PS2 mouse driver. After several minutes of normal  
> > use,
> > the mouse pointer suddenly goes mad, with the slightest touch of the
> > mouse causing the pointer to go flying around the screen. The only
> > solution to this problem is to reboot the VM instance :(
> >
> > Looking at the NT4 Event Log, I see the following messages when this
> > occurs:
> >
> > An unexpected RESET was detected from the mouse device
> >
> > Followed by:
> >
> > Could not set the mouse sample rate
> >
> > The latter message is repeated in the event log when the mouse is  
> > moved
> > until the VM is rebooted. Has anyone experienced this behaviour  
> > before?
>
> Okay, I've investigated this a little bit more and far as I can  
> tell, it
> seems related to the intellimouse extensions. At least, if I force  
> qemu to
> emulate a standard PS/2 mouse (rather than an intellimouse), then I  
> don't
> see the problem with the mouse pointer. Perhaps the in-built MS NT4  
> mouse
> driver is broken?
>
> Would anyone be interested in a patch against 0.9.1 to add a new  
> command
> line option such as -forceps2mouse which would force this behaviour  
> for
> broken guests such as NT4?

I from my side would rather like to see a generic -ps2mouse option,  
that has the option to disable the ps2 mouse in all. So what I'm  
thinking of would be something along the lines of:

-ps2mouse intellimouse [default]
-ps2mouse old
-ps2mouse none

Alex

> ATB,
>
> Mark.
>
> --
> Mark Cave-Ayland
> Sirius Corporation - The Open Source Experts
> http://www.siriusit.co.uk
> T: +44 870 608 0063