keyboard leds for urgency hint

[John Hein]

Zeus Panchenko wrote at 16:53 +0200 on Feb 17, 2012:
 > hi all,
 > 
 > please, may somebody advice, 
 > 
 > how can I switch on/off keyboard leds under xorg?
 > 
 > I want to set urgency hint on event (IM message arrival for example),
 > but while trying to test it with `xset led ...' I was unable to switch
 > any led except Scroll Lock, but I need to do that with Caps Lock :(
 > 
 > is there way to do that?

man kbd(4)
Try the XLeds option documented there.