[Qemu-devel] [Bug 1658634] Re: Can't get correct display with latest QEMU and OVMF BIOS

["Laszlo Ersek \(Red Hat\)" <lersek@redhat.com>]

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 <marcandre.lureau@redhat.com>
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 <marcandre.lureau@redhat.com>
    Message-id: 20160826094711.14470-1-marcandre.lureau@redhat.com
    Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

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

** Changed in: qemu
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1658634

Title:
  Can't get correct display with latest QEMU and OVMF BIOS

Status in QEMU:
  Confirmed

Bug description:
  I tried to install a Ubuntu 16.04.1 Desktop 64bits with latest QEMU and OVMF UEFI BIOS, however I can't get correct display output with default vga configuration (-vga std). However, qemu works with a couple of different configurations:
  1. "-vga cirrus" + "-bios OVMF.fd": works
  2. "-vga std" + non-UEFI bios: works

  The same error with QEMU 2.8.0 release. Everything works well on
  2.7.0/1.

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