SOLUTION : Lockup when suspending from X

[Norberto Meijome]

On Mon, 30 Jan 2006 01:36:43 +1100
Norberto Meijome <numard at meijome.net> wrote:

> Hi all,
> I need some help trying to understand why this is happening.
> 
> apm -z (or zzz) works just fine from any of the text-based virtual 
> consoles. If I run it from a shell in X, either as root or myself
> with sudo, the computer locks up - no panic, nothing . The only
> change I can see is the light in the USB mouse goes out,  and that's
> it, total lock.
> 
> If I do ctrl-Alt-F1 , a non-stopping beeping ensues.
> 
> Upon restart, there is no log whatsoever of the apm -z  attempt, and 
> background fsck is run against all partitions
> 
> sudo apm -z works fine.
> It happens in X having kdm or not kdm, KDE or just an xterm with no 
> window manager running (aka 'failsafe'  session type in kdm)
> 
> - Toshiba Tecra A2, Bios 1.30
> - FreeBSD xxxxxxx 6.0-STABLE FreeBSD 6.0-STABLE #0: Thu Jan 19
> 01:54:47 EST 2006     root at xxxxxx:/usr/obj/usr/src/sys/GENERIC  i386
> 
> - APM, no ACPI (disabled via boot/device.hints) (long story, tons of 
> g_vfs_done errors on resume) works for suspend (apm -z )and standby
> (apm -Z) .
> - rc.conf : allscreens_flags="MODE_30"
> apm_enable="YES"
> apmd_enable="YES"
> (and lots others, but only these seem relevant)
> - Xserver : xorg-server-6.8.2_6  ,    xorg-libraries-6.9.0
> - KDE 3.4.2

---
For the archive :

sysctl knob 
hw.syscons.sc_no_suspend_vtswitch=1

fixed the issue

Add it to /etc/sysctl.conf so it's set on start up