The patch mentioned by Philippe ("vga: fix cirrus bios") has been included into
QEMU via this commit here:
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=de15df5ead400b7c3d0cf2
... which has been released as part of QEMU v5.1 already. Thus this issue
should be fixed now.
** Changed in: qemu
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1884990
Title:
Cirrus graphics results in monochrome colour depth at 640x480
resolution
Status in QEMU:
Fix Released
Bug description:
Recently we upgraded to a distribution that bundled QEMU 4.2.0. We
were previously running on QEMU 3.0.0. When booting Windows 10 VMs on
x86_64, users experienced slow, monochrome graphics and the resolution
was restricted to 640x480. Reverting to the prior vgabios-cirrus.bin
from the prior source tarball remediated the issue.
An example QEMU command line is below, if needed:
/bin/qemu-system-x86_64 -vnc 0.0.0.0:100 -device
cirrus-vga,id=video0,bus=pci.0,addr=0x2 -machine
pc-i440fx-4.2,accel=kvm,usb=off,dump-guest-core=off -cpu qemu64 -m 2048
-overcommit mem-lock=off -smp 1,sockets=1,cores=1,threads=1 -no-user-config
-nodefaults -hda test.raw &
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