Hyper-V Framebuffer module does not work on generation2 VMs

[Jan Henke]

After installing a fresh daily image on a generation 2 Hyper-V VM, the following two lines appear during start and in the system log:

[ 19.773125] hyperv_fb: Unable to find PCI Hyper-V video
[ 19.773125] hyperv_fb: No memory for framebuffer

The modules does not work, as the display resolution is not set correctly. In a generation 1 VM the Problem does not exist.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-17-generic 3.13.0-17.37 [modified: boot/vmlinuz-3.13.0-17-generic]
ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
Uname: Linux 3.13.0-17-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDesktop: XFCE
Date: Fri Mar 14 09:00:38 2014
HibernationDevice: RESUME=UUID=0d223c65-8c7e-41b4-95b3-05b22ff4679b
InstallationDate: Installed on 2014-03-12 (1 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140312)
IwConfig:
 eth0 no wireless extensions.

 lo no wireless extensions.
Lspci:

Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
MachineType: Microsoft Corporation Virtual Machine
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-17-generic.efi.signed root=UUID=61b52c1b-300d-4c30-8966-db1745f4a4bc ro video:hyperv_fb=1920x1080 quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-17-generic N/A
 linux-backports-modules-3.13.0-17-generic N/A
 linux-firmware 1.126
RfKill:

SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/26/2012
dmi.bios.vendor: Microsoft Corporation
dmi.bios.version: Hyper-V UEFI Release v1.0
dmi.board.asset.tag: None
dmi.board.name: Virtual Machine
dmi.board.vendor: Microsoft Corporation
dmi.board.version: Hyper-V UEFI Release v1.0
dmi.chassis.asset.tag: 6485-6574-9248-6162-4701-6267-50
dmi.chassis.type: 3
dmi.chassis.vendor: Microsoft Corporation
dmi.chassis.version: Hyper-V UEFI Release v1.0
dmi.modalias: dmi:bvnMicrosoftCorporation:bvrHyper-VUEFIReleasev1.0:bd11/26/2012:svnMicrosoftCorporation:pnVirtualMachine:pvrHyper-VUEFIReleasev1.0:rvnMicrosoftCorporation:rnVirtualMachine:rvrHyper-VUEFIReleasev1.0:cvnMicrosoftCorporation:ct3:cvrHyper-VUEFIReleasev1.0:
dmi.product.name: Virtual Machine
dmi.product.version: Hyper-V UEFI Release v1.0
dmi.sys.vendor: Microsoft Corporation