When I open kvm in unity 3d (just executing a naked kvm is sufficient), the window resizes many times quite fast. It may take kvm two seconds or over ten seconds to settle down, but it always does.
I tried different -vga options, all with the same effect. If I start kvm in unity 2d, this problem is not present.
I also attached two screenshots, both kvm -cdrom precise-alternate-amd64.iso. One was taken in unity 2d, the other in unity 3d. I didn't change anything beside unity, but the window size is still different.
ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: qemu-kvm 1.0+noroms-0ubuntu13
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
ApportVersion: 2.0.1-0ubuntu5
Architecture: amd64
Date: Thu Apr 26 08:10:23 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120327.1)
KvmCmdLine: Error: command ['ps', '-C', 'kvm', '-F'] failed with exit code 1: UID PID PPID C SZ RSS PSR STIME TTY TIME CMD
MachineType: Komax AG, Dierikon Komax DEVL-PC
ProcEnviron:
LANGUAGE=en_US:en
TERM=xterm
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-23-generic root=UUID=161294ef-f06c-4757-a3c5-523c3efbe205 ro crashkernel=384M-2G:64M,2G-:128M quiet splash vt.handoff=7
SourcePackage: qemu-kvm
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/23/2011
dmi.bios.vendor: Intel Corp.
dmi.bios.version: BLH6710H.86A.0119.2011.0523.1030
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: DH67GD
dmi.board.vendor: Intel Corporation
dmi.board.version: AAG10206-205
dmi.chassis.asset.tag: 0
dmi.chassis.type: 3
dmi.chassis.vendor: Komax AG, Dierikon
dmi.chassis.version: DEVL01
dmi.modalias: dmi:bvnIntelCorp.:bvrBLH6710H.86A.0119.2011.0523.1030:bd05/23/2011:svnKomaxAG,Dierikon:pnKomaxDEVL-PC:pvrDEVL01:rvnIntelCorporation:rnDH67GD:rvrAAG10206-205:cvnKomaxAG,Dierikon:ct3:cvrDEVL01:
dmi.product.name: Komax DEVL-PC
dmi.product.version: DEVL01
dmi.sys.vendor: Komax AG, Dierikon
mtime.conffile..etc.default.qemu.kvm: 2012-04-23T12:31:32.561894
Thanks for reporting this bug. It's definately an annoying one, and drives me to using vnc. I've reported it previously as bug 986192, so will mark this a duplicate of that.
I do wonder if it is in fact caused by the root cause of bug 504368.