Re: [Qemu-devel] [PATCH] [RFC] usb-wacom

[Jamie Lokier]

François Revol wrote:
> Hi there.
> We use QEMU a lot to debug Haiku, http://haiku-os.org/
> I also wrote a little php script that use it to demo images online,
> serving a VNC java applet to connect to it with VNC.
> http://dev.haiku-os.org/browser/haiku/trunk/3rdparty/mmu_man/onlinedemo/haiku.php
> It's a bit like what live.OSZoo does, but simpler.
> 
> To accomodate the VNC setup, I tried to use the usb tablet emulation.
> It turns out Haiku has a driver for Wacom tablets:
> 
> http://dev.haiku-os.org/browser/haiku/trunk/src/add-ons/kernel/drivers/input/wacom
> http://dev.haiku-os.org/browser/haiku/trunk/src/add-ons/input_server/devices/wacom
> 
> However, it didn't really work very well with qemu's usb-wacom code.
> 
> First, mouse stayed in the top-left corner... Seems coords were set to
> 0,0 when no button is pressed, which is wrong, most tablets actually
> sense the stylus even when it's not yet touching the surface.

I see similar problems with Windows Server 2003 guest and the USB
tablet emulation.  The pointer jumps about randomly, so it's not
usable.  It works fine with Windows XP guest.

-- Jamie