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Date: Mon, 06 Apr 2009 19:01:19 +0100
From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
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Subject: Re: [Qemu-devel] [6989] Fix display breakage when resizing the screen
	(v2) (Avi Kivity)
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To: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

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 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.

>> 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 :)).