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Date:      Sun, 19 Oct 2014 19:12:30 +0200
From:      =?windows-1252?Q?Jean-S=E9bastien_P=E9dron?= <jean-sebastien.pedron@dumbbell.fr>
To:        freebsd-x11@freebsd.org
Subject:   Re: Machine lockup - WAS: Re: drmn0: error: GPU lockup CP stall for more than 10000msec
Message-ID:  <5443F0FE.4060400@dumbbell.fr>
In-Reply-To: <7118ea03de5b97785ccbb476f67253ef@mail.mikej.com>
References:  <42f077e55c2d4eea5a65f4f83209e26e@mail.mikej.com> <7118ea03de5b97785ccbb476f67253ef@mail.mikej.com>

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On 16.09.2014 22:52, Michael Jung wrote:
> Since starting to use the DRI driver I am having problems with my machi=
ne
> locking up.  Remote ssh sessions die, keyboard dead, screen blank.

Most Radeon GPU lockups come from the fact we use(d) a version of Mesa
too old (9.1.7). Now, for FreeBSD 10.1 and 11-CURRENT, Mesa 10.3.0 is
provided (or will be with the next package build) and this version works
*way* better for Radeon users.

> I am asking for pointers on how to try and debug this.  My system is ZF=
S
> on boot so I created a swap partition on USB /dev/da0s1b and added
>=20
> dumpdev=3D"/dev/da0p1"
>=20
> to rc.conf.  After rebooting into single user mode and mounting zfs
> partitions "zfs mount -a" I tried
>=20
> #savecore /var/crash /dev/da0p1 but savecore complains that no core fil=
es
> were found. Is kernel dump to USB swap not supported?

Yes it is.

You may need to add the following sysctl:
debug.debugger_on_panic=3D0

It should not be necessary with vt(4), but with syscons, this allows the
kernel to dump core after an X session was started.

--=20
Jean-S=E9bastien P=E9dron


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