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port-amd64/45892: System freeze with video effects

>Number:         45892
>Category:       port-amd64
>Synopsis:       System freeze with video effects
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Jan 31 02:15:00 +0000 2012
>Originator:     Gary Duzan
>Release:        NetBSD 5.99.60, Fri Jan 27
System: NetBSD capo 5.99.60 NetBSD 5.99.60 (GENERIC) #34: Fri Jan 27 08:06:04 
EST 2012 root@capo:/usr/obj/sys/arch/amd64/compile.amd64/GENERIC amd64
Architecture: x86_64
Machine: amd64
        System hangs under heavy activity. Problems visible under X or on 
        Typical scenario is browsing using Firefox, screen is covered with 
        stripes, and system is non-responsive. Similar video effects when 
        on console.
        Commenting out the section of sys/arch/amd64/include/types.h with
        __HAVE_DIRECT_MAP, __HAVE_MM_MD_DIRECT_MAPPED_IO, etc., makes the
        system much more stable.

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