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+graphic: 0.472
+x86: 0.192
+device: 0.158
+semantic: 0.133
+performance: 0.103
+architecture: 0.090
+vnc: 0.057
+peripherals: 0.054
+virtual: 0.053
+ppc: 0.049
+boot: 0.048
+register: 0.048
+user-level: 0.043
+mistranslation: 0.042
+debug: 0.041
+socket: 0.040
+network: 0.033
+permissions: 0.032
+PID: 0.030
+hypervisor: 0.025
+files: 0.019
+KVM: 0.018
+risc-v: 0.015
+VMM: 0.014
+kernel: 0.013
+TCG: 0.013
+arm: 0.011
+i386: 0.008
+assembly: 0.007
+
+Cirrus graphics results in monochrome colour depth at 640x480 resolution
+
+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 &
+
+This seems to be the following SeaBIOS bug:
+https://<email address hidden>/msg12271.html
+
+Ah, great catch!  Yes, that does appear to be the issue+fix.  Is QEMU planning on integrating the next release of SeaBIOS or fixing this as a one-off for now?
+
+Yes, the maintainer will likely get the submodule updated before the next release.
+
+This issue is still marked as unresolved almost 6 months later. Has the submodule been updated and merged into QEMU yet?
+
+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.
+