install/49470: NetBSD 7 BETA reboots after bootloader (HP 2133)

[tuotila%gmx.com@localhost]

>Number:         49470
>Category:       install
>Synopsis:       NetBSD 7 BETA reboots after bootloader (HP 2133)
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    install-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Dec 14 18:55:00 +0000 2014
>Originator:     Terho Uotila
>Release:        7.0_BETA 201412140250Z and earlier
>Organization:
>Environment:
Linux h2133 3.2.0-4-686-pae #1 SMP Debian 3.2.63-2+deb7u1 i686 GNU/Linux
(from different OS on same machine)
>Description:
Trying to install 7.0 beta i386 using usb image on HP 2133 Mini-Note, boot loader works as expected, but after spinners have finished and green text should appear, screen blanks instead and then machine reboots (or power cycles, whichever is correct term, if there's difference)

All 3 install menu options have same result (normal, no acpi, no acpi+no smp).

Cpu is VIA C7-M, which should be i386 compatible (and indeed, at least Debian works, see uname above, as well as original Windows Vista)
>How-To-Repeat:
Boot install media from usb stick or sd card
>Fix: