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Re: [libvirt] [PATCH] qemu: qxl devices don't support multifunction yet



On Tue, Sep 20, 2011 at 02:41:44PM +0200, Marc-André Lureau wrote:
> Hi
> 
> On Tue, Sep 20, 2011 at 3:11 AM, Wen Congyang <wency cn fujitsu com> wrote:
> >
> > So I think qxl device supports multifunction.
> >
> 
> It works on Linux, but not on Windows. It is most likely a driver bug,
> but nobody so far found a solution.
> 
> Using windows kernel debugger, the only "interesting" message I could find is:
> 
> "VIDEOPRT: Multifunction board not allowed to start"
> 

Now that I see it a second time, this looks obviously like a problem with the
built in videoprt.sys, so nothing we can fix without rewriting our driver to
use the newer WDDM framework, and that would not work for XP anyway. I would
look for documentation on videoprt.sys limitations.

> (I compared windows kernel log of various pnp/pci/video mask with and
> without multifunction qxl, it didn't help me to find why windows
> refuse to start it)
> 
> regards
> 
> -- 
> Marc-André Lureau
> 
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