[CentOS] SysRq over usb serial adapters

[Warren Young]

On 9/30/2013 21:34, Barry Brimer wrote:
>> I'm using 115200, 8N1, VT102.  I can echo m > /proc/sysctl-trigger,
>> and dmesg shows that the sysrq was received when initiated via the
>> procfs interface.  But not over serial, and that's what I need.
>
> I could be wrong .. but you may need to edit your grub config to convince
> your system that the serial terminal is a/the console ..

That's only part of it.  The topic has a whole HOWTO dedicated to it:

     http://www.tldp.org/HOWTO/Remote-Serial-Console-HOWTO/