kern/82064: DRM not working with SMP
Walter C. Pelissero
walter at pelissero.de
Thu Jun 9 12:30:23 GMT 2005
>Synopsis: DRM not working with SMP
>Arrival-Date: Thu Jun 09 12:30:21 GMT 2005
>Originator: Walter C. Pelissero
>Release: FreeBSD 5.4-STABLE i386
System: FreeBSD zaphod.home.loc 5.4-STABLE FreeBSD 5.4-STABLE #0: Tue Jun 7 00:19:00 CEST 2005 root at zaphod.home.loc:/usr/src/sys/i386/compile/TYAN-TIGER-MP i386
Dual Athlon MP and a Ati Radeon 7000-VE AGP.
The DRM driver (at least the Radeon) doesn't seem to work with
SMP. If X makes use of DRI the whole system freezes.
On a multiprocessor system configure a 5.4-STABLE for SMP,
then add the line Load "dri" in xorg.conf and run X. After a
few moments of use the system freezes. The exact activity
that triggers the bug is not known but a few open windows are
If the same system is booted with kern.smp.disabled="1" in
device.hints the system, including DRI/DRM, works just fine.
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