That's curious - I'm on running 4.9 on a 4.2.2 rom, and yeah, the option to capture last_kmsg is indeed greyed out, but that could be because there aren't any error messages for it to be generated. Don't know for sure, but that's my guess. Maybe someone with better knowledge can chime in here.Funny that you mentioned that app. If I'm running a CM kernel, the last_kmsg option is available in that app, but when running AJK 4.9, that option is not available. Anything special needed to be configured for last_kmsg to be available?
If you want just the kmsg, then yes you'll need a different app like SysLog.I have catlog. Is that an option I'm missing or do I need to get a different app? Also, what about the next poster's Q?