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port-i386/38729: ACPI kernel booted under qemu cannot detect devices

>Number:         38729
>Category:       port-i386
>Synopsis:       ACPI kernel booted under qemu cannot detect devices
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu May 22 15:53:17 +0000 2008
>Originator:     David Brownlee
>Release:        NetBSD 4.99.63
System: NetBSD 4.0_STABLE NetBSD 4.0_STABLE (_ACPI_) #4: Sun Apr 
20 17:33:56 BST 2008
Architecture: i386
Machine: i386
        When an ACPI enabled kernel is booted under qemu it cannot detect
        the network or disk devices. Booting a kernel with ACPI disabled,
        or running qemu with -no-acpi does not show the issue.

        Its quite likely this is a qemu bug, but it could also be qemu
        showing up an edge case in NetBSD's ACPI support.

        Other devices, including the emulated CD drive appear to be
        detected fine


        - Install qemu
        - Download the latest i386 boot.iso from
        - Create a virtual disk 'qemu-img create -f qcow2 test.img 1G'
        - Boot the ISO image 'qemu -hda test.img -cdrom boot.iso -boot d'

        If you want to interrupt the boot to disable ACPI then you need to
        hit space *extremely* quickly after the qemu window opens, as the
        boot timer countdown runs much faster under qemu.



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