Re: [Qemu-devel] [6989] Fix display breakage when resizing the screen (v2) (Avi Kivity)

[Avi Kivity]

Stefano Stabellini wrote:
> Avi Kivity wrote:
>
>   
> > Stefano Stabellini wrote:
> >     
> > > I tried several times to manually reproduce the issue with no luck: if
> > > no vnc clients are supposed to be connected, how do you make the cirrus
> > > emulated hw do a bitblit?
> > >   
> > >       
> > The guest will boot and do it by itself.
> >     
>
>
> what is the OS?
>   

In the cases I saw, I think it was Windows.  Sorry, I can't be sure and 
I didn't keep any records.

> > > In any case it makes sense that the problem is in qemu_console_copy()
> > > rather than in the rop function itself that only operates on the
> > > emulated framebuffer.
> > > But calling qemu_console_copy() in cirrus_do_copy() shouldn't be risky
> > > because before that, we call vga_hw_update() that should do the resize.
> > >   
> > >       
> > vga_hw_update() may not actually do anything if the conditions are 
> > right, and maybe that's the case here.
> >     
>
> I thought about it, but if vga_hw_update does nothing, then
> qemu_console_copy does nothing too.
>   

True.

> > > Without a better understanding of the bug I will refrain from making any
> > > suggestion.
> > >
> > >   
> > >       
> > There's a backtrace in 
> > https://bugzilla.redhat.com/show_bug.cgi?id=494002.  I'll also try to 
> > generate a good scenario for reproducing this.
> >
> >     
>
>
> thanks, that would be very useful (if it doesn't require me to compile
> kvm it would be even better :)).
>   

If you're running a recent distro it's already built in :)

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