Freebsd 8.1 + xorg + radeonhd hang

[Warren Block]

On Wed, 15 Sep 2010, Oliver Pinter wrote:

>
> it's an old problem:
> http://lists.freebsd.org/pipermail/freebsd-x11/2010-February/009372.html

Please don't top-post, it makes responding more difficult.

> And still exist... with or without dri/3d, it's a bug between freebsd
> agp and xorg-server.
>
> When you use vesa, than this problem is elliminated. With radeon or
> radeon-hd driver, the problem come back, and the machine locked up.
> When you killed the xserver, end kldunloaded the radeon modul, then
> presented a small memory leak, and the radeon kernek modul is not
> reloadable.
> The DRI/DRM/3D is completly independent from this bug. The bug is in
> libpciaccess or xorg-server. The old xserver (<=1.4.X) is bugfree....

Was OP unloading the radeon kernel module?  I can verify that once the 
radeon module is unloaded, it doesn't work after reloading.  But for me, 
X just complains about no screens found, it doesn't lock up.  If the 
radeon module stays loaded, X starts and restarts fine.  Tested ten 
restarts without problems.