Comment 3 for bug 1658634

I downloaded "ubuntu-16.04.1-desktop-amd64.iso" (MD5: 17643c29e3c4609818f26becf76d29a3), and I can reproduce the issue -- the grub2 display is corrupt. (I didn't even look further than that.) I also confirm that it works fine with the same firmware, but using QEMU 2.7.

Here's the result of the bisection:

cd958edb1fae85d0c7d1e1acbff82d22724e8d64 is the first bad commit
commit cd958edb1fae85d0c7d1e1acbff82d22724e8d64
Author: Marc-André Lureau <email address hidden>
Date: Fri Aug 26 13:47:11 2016 +0400

    console: skip same-size resize

    virtio-gpu does a set-scanout at each frame (it might be a driver
    regression). qemu_console_resize() recreate a surface even if the size
    didn't change, and this shows up in profiling reports because the
    surface is cleared. With this patch, I get a +15-20% glmark2
    improvement.

    Signed-off-by: Marc-André Lureau <email address hidden>
    Message-id: <email address hidden>
    Signed-off-by: Gerd Hoffmann <email address hidden>

If I revert this commit on top of current master -- it reverts cleanly -- then the grub2 screen displays fine again.