[Spice-devel] Note on failure w/ qemu < 1.2

[Christophe Fergeau]

Hey Jeremy,

Thanks  for that detailed analysis, I believe this would be very nice to
have in the commit log.

Christophe

On Wed, Mar 20, 2013 at 03:07:10PM -0500, Jeremy White wrote:
> I discovered late last week that my patch
> beccf8e81ea6bb4c86bcaf3cd4aac5e18f6d3f0d:
>   Establish a preferred default of 1024x768 correctly.
> 
> causes a failure if running a Linux guest VM with an older host qemu
> (qemu < 1.2).
> 
> This comes about because the video ram allocated
> by older qemu versions (8M) is not enough to hold the
> default heads (4) times the default screen size (1024x768).
> 
> It worked previously because the previous code was a bit of a mess; it
> would hard code 1024x768, and it all worked out, because a resize came
> through shortly to 'fix' things.
> 
> After investigating, it appeared to me that the failure was a disconnect
> between our randr code and our screen setup code.  Our randr code was
> acting as though all 4 heads were initially connected, resulting in a
> virtual screen size of 4096x768.
> 
> I believe the patch I submitted prior to this email fixes this
> correctly, by also having the randr code start with only one
> connected monitor.
> 
> Cheers,
> 
> Jeremy
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