Still trying to figure out my low library scan issue and saw this is being posted to dmesg every few seconds
There are few ways you can check what is going on. With top try to determine which process takes most CPU time. I guess Kodi, but you never know. Next, you can check perf top, which will tell you which functions currently take most CPU time. This should give good pointer where to look next.
dw_hdmi_cec_hardirq: stat=11 LOW_DRIVE
Is this relevant?
I don't think this should cause any issue. Actually, I'm thinking of removing that message or even whole patch, which introduced it. But yes, it's not ideal to have it. Are you testing this with monitor or TV? If on TV, toggle CEC state in TV settings (on <-> off). Note that TV manufacturers usually use different name for CEC, like simplink, viera link, etc.