Raring crashes on 12.04 LTS host with cirrus @800x600

[Roman Yepishev]

STR:

1. Install 13.04 current in 12.04 LTS kvm machine
2. Change resolution to 800x600 in the guest
3. Log out
4. Log in

Expected results:
Unity desktop is displayed

Actual results:
Virtual machine hangs, restarts (with no kernel panic). Sometimes general protection fault is seen in dmesg (and bad swap file message too)

Changing cirrus model to a vga makes it possible for VM to login properly.

The reason why I was switching to a lower resolution is because the display did not fit into my netbook properly.

In guest 12.10 changing resolution works as expected on both cirrus and vga.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: qemu-kvm 1.0+noroms-0ubuntu14.7
ProcVersionSignature: User Name 3.2.0-35.55-generic 3.2.34
Uname: Linux 3.2.0-35-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
Date: Wed Jan 23 11:30:57 2013
InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Release amd64 (20120424.1)
MachineType: System manufacturer System Product Name
MarkForUpload: True
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-35-generic root=/dev/mapper/hostname-root ro
SourcePackage: qemu-kvm
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/28/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2302
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A785T-M
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2302:bd02/28/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A785T-M:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

[Serge Hallyn (serge-hallyn)]

Thanks for reporting this bug. Marking medium priority - not high because there is a workaround and it's a non-default condition, and not low because you can crash before doing the workaround.