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[Qemu-devel] [Bug 1658634] Re: Can't get correct display with latest QEM
From: |
Laszlo Ersek \(Red Hat\) |
Subject: |
[Qemu-devel] [Bug 1658634] Re: Can't get correct display with latest QEMU and OVMF BIOS |
Date: |
Tue, 24 Jan 2017 09:06:56 -0000 |
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 <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 <address@hidden>
Message-id: address@hidden
Signed-off-by: Gerd Hoffmann <address@hidden>
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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