kern/44565: X works for about thirty seconds and then freezes on my MacBook1,1

[Taylor R Campbell <campbell+netbsd%mumble.net@localhost>]

>Number:         44565
>Category:       kern
>Synopsis:       X works for about thirty seconds and then freezes on my 
>MacBook1,1
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Feb 13 23:15:00 +0000 2011
>Originator:     Taylor R Campbell <campbell+netbsd%mumble.net@localhost>
>Release:        NetBSD 5.1
>Organization:
>Environment:
NetBSD oberon.local 5.1 NetBSD 5.1 (GENERIC) #0: Sun Nov  7 14:39:56 UTC 2010  
builds%b6.netbsd.org@localhost:/home/builds/ab/netbsd-5-1-RELEASE/i386/201011061943Z-obj/home/builds/ab/netbsd-5-1-RELEASE/src/sys/arch/i386/compile/GENERIC
 i386
Architecture: i386
Machine: i386
>Description:

        On my MacBook1,1, when I launch X (approximately, by typing
        `startx'), it runs for about thirty seconds, and then
        everything but the mouse cursor freezes.  If I move the mouse
        about, the cursor changes styles occasionally.

        I am using modular X.org from pkgsrc-2010Q3, with libpciaccess
        from pkgsrc-current as of a couple of days ago to include
        jmcneill's i386 mtrr fix.  The MacBook has an Intel graphics
        card for which I have installed x11/xf86-video-intel from
        pkgsrc.  If you want detailed information about it, or about
        any other part of my system, let me know what to run to procure
        the information.  Here are the relevant lines from `pcictl pci0
        list':

000:02:0: Intel 82945GM/PM/GMS Integrated Graphics Device (VGA display, 
revision 0x03)
000:02:1: Intel 82945GM/PM/GMS Integrated Graphics Device (miscellaneous 
display, revision 0x03)

        The problem persists in a 5.1_STABLE kernel that I built from
        netbsd-5 as of a couple of weeks ago.  The problem goes away if
        instead I boot a kernel built from HEAD as of a couple of weeks
        ago.  (But I don't want to run a NetBSD-current kernel.)

>How-To-Repeat:

        Install x11/modular-xorg-server and x11/xf86-video-intel under
        NetBSD 5.1 on a MacBook1,1.  Launch X.  Try to use it.  Watch
        it freeze.

>Fix:

        Yes, please!