switch users --> black screen, no response [in 12.04]

[MR ZenWiz]

On Sat, May 18, 2013 at 2:01 PM, chris <chevhq at gmail.com> wrote:
> On Sat, 2013-05-18 at 14:38 +0100, pete smout wrote:
>> On 18/05/13 10:01, chris wrote:
>> > On Fri, 2013-05-17 at 22:21 -0700, rikona wrote:
>> >> Hello chris,
>> >>
>> >> Friday, May 17, 2013, 2:06:10 PM, chris wrote:
>> >>
>> >>> Try from the keyboard
>> >>> holding ctr alt syrq  the press in sequence rseiub
>> >>> This is the sysreq command for a clean shut down and reboot which should
>> >>> safely close the usb drives.
>> >>
>> >> WOW - that is a keeper! I didn't know about sysreq, but now see how
>> >> useful it can be.
>> >>
>> > There are other sysreq commands, and I can suggest you can google for
>> > them
>> >
>> Hi,
>>
>> Apparently they have to be enabled!! see
>> http://www.unixmen.com/use-magic-sysrq-combination-key-to-recover-from-a-frozen-system-in-linux-ubuntu/
>>
> Has been enabled by default in every Ubuntu version I have used.
> ie no need to enable it it is part od the kernel code
>

When I type <ctl><alt><sysreq>, I get the print screen window.  Same
with the shift key added.

Whazzup there?

MR