VGA framebuffer shows very strange behaviour with QEMU's SDL display: I run qemu with my harddisk which contains a debian grub2 bootloader. grub2 is configured to display a 1280x1024 png background image (moreblue-orbit-grub.png resized to my monitor resolution).
i386-softmmu/qemu /dev/sda -enable-kvm
-enable-kvm is just to get more speed (without, it takes longer
to see the bug).
Running like this gives random results: sometimes, the png is shown
correctly, sometimes not.
But you will always get a bad display when you resize the QEMU window
while in grub's boot menu (a screenshot is appended).
git bisect detects this commit:
0bd8246bfec1dfb2eb959f52db535572c0260f4c is first bad commit
commit 0bd8246bfec1dfb2eb959f52db535572c0260f4c
Author: Stefano Stabellini <stefano.stabell...@eu.citrix.com>
Date: Mon Aug 3 16:14:39 2009 +0100
vga: do not resize the screen on hw_invalidate
Hi all,
currently vga always resizes the screen when vga_hw_invalidate is called
while this is not required and all the other graphic emulators don't.
This patch fixes it, making vga invalidate behaviour consistent with the
other emulated devices.
Signed-off-by: Stefano Stabellini <stefano.stabell...@eu.citrix.com>
Signed-off-by: Anthony Liguori <aligu...@us.ibm.com>
Reverting it fixes the bug.
As this is already the second bug caused by the same commit
and it is also part of a stable version, I recommend reverting it
(then there is more time to look for a better solution).
Regards,
Stefan Weil
<<inline: grub-with-qemu.jpg>>
