I just found out the meaning (or one meaning) of the
pattern, which I have set to yellow a long time ago.
Yesterday, when I received my first GTalk video chat call, that yellow pattern started to flash!
So at least GTalk video chat fires PatternCommonNotification.

Just in case someone is interested in having simple visuals for SMS, Call and E-mail that don't stand out too much:
PatternCommunicationCall=30;1;0;bG;9d8002ff03ff02f f03ffe00440007f00e1000000;9d80e08002ff09ff7f007f00 7f00e00240000000
PatternCommunicationSMS=30;1;0;bRG;9d8002ff03ff02f f03ffe00440007f00e1000000;9d80e08002ff09ff7f007f00 7f00e00240000000
PatternCommunicationEmail=30;1;0;bR;9d8002ff03ff02 ff03ffe00440007f00e1000000;9d80e08002ff09ff7f007f0 07f00e00240000000


All have two fast blue flashes (like normal info on those) plus distinctive colour for each - this makes it easy to tell if there is just e-mail or important sms/call that requires attention. Nice to have on meetings where unnecessary juggling with phone is awkward.

E-mail is blueblue-red
SMS blueblue-"yellow"
Call is blueblue-red

Alter colours as you find appropriate.

edit: Some odd spaces in the middle, remove all.

I use WHITE<->RED alternating on infinite for SMS, WHITE<->BLUE alternating on infinite for emails and WHITE<->PINK alternating on infinite for IM. Works good.

Could someone help me a bit? I have been trying to study those led patterns, but I happen to be too stupid to fully understand. I have managed to change the notification led colors to little bit Jolla-like way:
- for missed calls green led blinking (default pattern)
- for SMS/IM blue led blinking (default pattern)
- for email white led blinking (default pattern)
- those above override "battery charging" and "battery full" leds which are otherwise default

Now I'd like to change the led blinking pattern for missed call/sms/im to little bit more frequent. I feel the default blink (2 short blinks, then longer pause) a bit too slow. When I pick my phone from pocket to give it a glimpse to ensure that I haven't missed anything important, I have to watch the led for few seconds (which is too long time ) to be sure. I'm not looking anything too fancy; no police siren type patterns or even breathing leds. Just some boring once-per-second blinking or so. How to do that?

At the moment my patterns are default (apart from the colors), so they should be like given here: https://wiki.maemo.org/LED_patterns#...for_Nokia_N900

Infinity blink
PatternCommunicationCall=0;5;0;b;9d804000670067004 0ff330033000000;9d800000

Change both 67 for led 'off' state, and both 33 for led 'on' state. Faster blinking with longer flash:
PatternCommunicationCall=0;5;0;b;9d804000550055004 0ff450045000000;9d800000
Enjoy

Thanks! I still have no idea what I'm doing, but this fits to my needs.