USB locks up system -- WAS Re: shutdown or acpi problem

[Steve Kargl]

On Thu, Nov 13, 2014 at 10:03:32AM -0800, Steve Kargl wrote:
> On Thu, Nov 13, 2014 at 09:25:33AM -0800, Steve Kargl wrote:
> > On Wed, Nov 12, 2014 at 02:42:13PM -0800, Steve Kargl wrote:
> > > I have a kernel/world from r274273 sources, which is exhibiting a new
> > > issue on my old laptop.  Neither 'shutdown -p now' nor 'shutdown -r now'
> > > work.  I get to the end of shutdown and see for example
> > > 
> > > All buffers synced
> > > Uptime: 4h23m15s
> > > 
> > > and then the laptop just sits there.  It does not power off with
> > > the -p option nor does it reboot with the -r.  Has anyone else
> > > seen this behavior?
> > > 
> > 
> > The problem appears to be related to a recent change in the
> > USB stack.  If I have the following drive plugged into a
> > usb port, the above behavior is observed on shutdown.
> > 

Adding

hw.usb.no_shutdown_wait: 1

to /boot/loader.conf appears to work around the 'shutdown -p now'
and 'shutdown -r now' issue.  Unfortunately, the bricking of the
laptop is not affected by this sysctl.  Once a device is plugged
into a usb, it must remain plugged in.

-- 
Steve