Comment 17 for bug 942316

> 12.04 beta1 on Hyper-V

 Yes, not work as need without ata_piix.prefer_ms_hyperv=0 in boot parametrs

But

 See
http://vvm.blog.tut.by/2012/03/29/linux-on-hyper-v-use-hv_storvsc-instead-of-ata_piix-to-handle-the-ide-disks-devices-but-not-for-the-dvd-rom-cd-rom-device-handling/

 Or

http://marc.info/?l=linux-kernel&m=133302969709312&w=2
==
List: linux-kernel
Subject: Linux on Hyper-V -- use hv_storvsc instead of ata_piix to handle the IDE disks devices ( but not for the DVD-ROM / CD-ROM device handling) Fw: [PATCH RFC] ata_piix: ignore disks in a hyper-v guest
From: "Victor Miasnikov"
Date: 2012-03-29 14:00:05

 . . .

"UBUNTU Way" Solution -- tested with
Ubuntu 12.04 LTS (Precise Pangolin) Daily Build 2012-03-13
precise-desktop-amd64.iso
, work Ok
 . . .
==