Comment 6 for bug 613681

Actually it does not quite work (ctrl+alt+f). It works for some small standard screen sizes, but chokes (aborts) on larger screen sizes.

 "Could not open SDL display"

and.. oops.

This is what Anthony had to say to my email to qemu-devel about this issue:

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Depending on how SDL is configured, it uses DGA or some other relic to actually implement full screen mode. You cannot get a DGA screen that's larger than the physical monitor since it's often backed by video memory. SDL isn't smart enough to degrade into a scaled mode either.

Honestly, SDL full screen mode is a bad idea. We offer no indication that the guest is actually running which is potentially very confusing/dangerous. We need a better backend to really implement a functioning full screen mode.

Regards,

Anthony Liguori
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So I'm not seeing how this bugreport is invalid... ;)