port-i386/51565: Xorg hangs the system upon starting, Intel Centrino laptop from 2003

[maelask3%gmail.com@localhost]

>Number:         51565
>Category:       port-i386
>Synopsis:       Xorg hangs the system upon starting, Intel Centrino laptop from 2003
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Oct 20 10:30:00 +0000 2016
>Originator:     Meober Whagby
>Release:        7.0.1
>Organization:
>Environment:
NetBSD afrodite.lan 7.0.1 NetBSD 7.0.1 (GENERIC.201605221355Z) i386
>Description:
Be it using the xorg server included in the X11 sets or a modular xorg, when trying to run "startx" or "X -configure", the whole system hangs, becoming unusable. Switching to other ttys doesn't work and the cpu usage seems to go through the roof, causing the fan to spin faster than normal.

The laptop in question has the following CPU and GPU:
- Intel Pentium M (1.4 GHz, Banias)
- Intel 855GM Chipset (which contains the IGP).

The logfiles produced by the system (/var/log/messages and /var/log/Xorg.0.log) remain empty.

Running X through the use of gdb or ktruss also results in a hang with no useful information reported, logs remaining empty.

I was told by a user on #NetBSD on freenode to try to run 'ldd /usr/X11R7/bin/xinit', command which appears to work, but has no effect in this issue.

The following sequence also results in a hang with no information reported:
# gdb --args X -configure
(gdb) b main
(gdb) run
(gdb) step
[RETURN]
[RETURN]

The system becomes unusable after the second RETURN keypress, with no information being displayed on console.



>How-To-Repeat:
1- Install NetBSD on a Intel Centrino laptop (Carmel platform)
2- Attempt to run "startx" or "X -configure" (any flavor of X will have the same problem, be it modular or monolithic)
>Fix: