amd64/97337: xorg reboots system if dri module is enabled

[Jonatan Cerri]

>Number:         97337
>Category:       amd64
>Synopsis:       xorg reboots system if dri module is enabled
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-amd64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue May 16 10:50:15 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Jonatan Cerri
>Release:        6.1-RELENG/amd64
>Organization:
student
>Environment:
FreeBSD  6.1-RELEASE FreeBSD 6.1-RELEASE #2: Mon May 15 17:54:15 CEST 2006     root@:/usr/src/sys/amd64/compile/MINE  amd64
>Description:
Using supported VGA-Card (ATI Radeon 9250 PCI), which is recognized at boot time, starting Xorg reboots the machine ungracefully, if the dri-module is uncommented in xorg.conf. This is the case in the default xorg configuration file generated with Xorg -configure. Commenting the line 'load "dri"' in the section "Module" of xorg.conf makes the problem go away. The card worked with dri hardware acceleration in a previous FreeBSD/i386 installation on a different mainboard/cpu. The Problem started when changing the mainboard and CPU. Current CPU is Pentium D 805, current Board is Asrock 775Dual-880Pro with VIA PT880Pro Chipset and 1GB DDRII Ram in dualchannel configuration.

Output of dmesg |grep drm:

drm0: <ATI Radeon RV280 9200> port 0xe000-0xe0ff mem 0xd8000000-0xdfffffff,0xff6f0000-0xff6fffff irq 17 at device 9.0 on pci0
info: [drm] Initialized radeon 1.19.0 20050911
drm0: <ATI Radeon RV280 9200> port 0xe000-0xe0ff mem 0xd8000000-0xdfffffff,0xff6f0000-0xff6fffff irq 17 at device 9.0 on pci0
info: [drm] Initialized radeon 1.19.0 20050911

'device agp' was removed from the kernel. the kernel runs with the new scheduler, but the problem persists when running with the old 4BSD scheduler.
>How-To-Repeat:
Install 6.1-RELEASE with bundled Xorg. Execute startx using xorg.conf with line 'load "dri"' in the section "Module".
>Fix:
Comment line 'load "dri"' in the section "Module" in xorg.conf.
>Release-Note:
>Audit-Trail:
>Unformatted: