Comment 6 for bug 1189753

i left my device running for a while, saw the same thing. Can confirm the governor was in 'performance' mode.
I saw this in logcat, maybe something's overheating. iirc, plasma is a heavy test on mobile gpus.

D/ThermalDaemon( 720): Sensor 'batt_therm' - alarm raised 7 at 45.0 degC