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Re: [Qemu-devel] Cursor problems.

From: Juergen Lock
Subject: Re: [Qemu-devel] Cursor problems.
Date: Wed, 18 May 2005 19:35:18 +0200

On Tue, May 17, 2005 at 09:10:58PM -0400, Jason wrote:
> On Wed, 2005-05-18 at 01:42 +0200, Juergen Lock wrote:
> > In article <address@hidden> you write:
> > >When running qemu on my HP laptop, I cannot seem to use the cursor in the
> > >guest os.  The guest OS can be any os, windows reactos linux, etc.  The
> > >host OS is fedora core 3. Basically, the cursor shows up as normal on the
> > >screen, but when I click in to let qemu grab the focus, the cursor jumps
> > >to the bottom right as soon as any motion happens.  The buttons all still
> > >function properly, I know this because in reactos the curusor is
> > >positioned just above the time.
> > >[...]
> > 
> > I cannot help you other than by saying this is the exact same
> > phenomenon i have on linux since switching to a 2.4 kernel (because
> > of this promise sata card i got, apparently there's no 2.6 driver
> > for that for some reason.)
> > 
> >  Same box runs qemu just fine with working cursor using FreeBSD as
> > host os...
> > 
> >     Juergen
> Well, I did a bit more investigation and put a printf into the function
> sdl_send_mouse_event in sdl.c to see what was being sent from the Host
> OS to the guest OS.  It would seem that the SDL_GetRelativeMouseState
> function is reporting odd values for dx and dy on my laptop but not on
> my other machine.  Both of them are running the same OS for the host OS,
> Fedora Core 3.  One is a normal computer with a PS/2 mouse and the other
> is a  laptop with a Synaptics Touch pad and a USB attached mouse.  The
> laptop actually has both devices going through GPM which is set as a
> repeater in PS/2 mode.  So the data being sent to xorg should be PS/2
> data.  Thus the data that SDL is getting should also be PS/2 data, but
> from the look of it, it isn't.  From the look of it, it should be
> reporting small changes either a small positive value or a small
> negative value.
> On my laptop it actually jumps all over the place.... but it's usually
> large positive values.  I have more investigation to do but it might be
> something like a buffer not getting written write or getting written
> with junk data.  
> Juergen, what type of pointing device do you have?

An optical wheelmouse connected on ps2, kudzu on kanotix detects it as
`ImPS/2 Generic Wheel Mouse'.

 And yes, SDL_VIDEO_X11_DGAMOUSE=0 fixes the problem for me too...


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