Hi Jo-Erlend,
as you know there are two SDL versions out there.
- 1.2 is deprecated and was since Ubuntu 18.10 no more in main, so it was no 
option anymore
- 2.0 OTOH was too new and had too much (many more than GTK at the time) issues 
with qemu.
  You see that in the qemu changelog:
  - sdl2 is yet too unstable for the LTS Ubuntu release given the reports      
    we still see upstream and in Debian - furthermore sdl2 isn't in main yet,  
    so we revert related changes to stick with the proven for now:             
    - 0fd25810 - do not build-depend on libx11-dev (libsdl2-dev already        
                 depends on it)                                                
    - 9594f820 - switch from sdl1.2 to sdl2 (#870025)
=> In Bionic we changed from SDL2 to SDL1.2 to avoid the issues
=> In Cosmic and later Debian and Ubuntu switched to GTK instead which worked 
much better (despite the quirks)

AFAIK sdl2 is not in main right now, so it is still now option to be
enabled instead or in addtion. We'd need a strong use case or issue to
spend all the work, it seems across Distros that GTK is the way to go
here.

I hope that explained your question - if not please open a new bug for
it to keep this one here clear.

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https://bugs.launchpad.net/bugs/1540692

Title:
  Enable the VirtIO GPU 3D (Virgil)

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