kern/82064: DRM not working with SMP

Walter C. Pelissero walter at
Thu Jun 9 12:30:23 GMT 2005

>Number:         82064
>Category:       kern
>Synopsis:       DRM not working with SMP
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>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
	usually enough.

	If the same system is booted with kern.smp.disabled="1" in
	device.hints the system, including DRI/DRM, works just fine.

	None known.


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