Hi everyone! For sharing purpose...
I broke out my contactless IR thermometer and went outside into the midday sun on my patio and set the phone down. Overheating and clamping down the display brightness doesn’t take long in this climate, about 5–10 minutes will do it. At around 115F (~45C) surface display temperature you’ll get clamped to 75% maximum until temperature drops down. I actually subjectively don’t think SGS2 is as prone to overheating as the Charge or Infuse.
Some other people have reported SGS2 crashing or encountering a thermal shutoff after a certain point, so I braved the heat and stayed outside even longer using the device until it hit well over 140F (60C) and still no system shutdown or overheating happened. That’s not to say it isn’t possible, as the SGS2 clearly does have thermal monitoring, for example the following lines from dmesg suggest some thermal monitoring going on, though I definitely crossed these boundaries to no ill effects:
<6>[ 0.047638] thr_low: 83, thr_high: 98 warn_low: 97 c warn_high 106
<6>[ 0.047715] tq0_signal_handle_init
<6>[ 0.047751] tmu_initialize: te_temp = 0x00000048, low 8bit = 72,
high 24 bit = 0
<6>[ 0.047765] Compensated Threshold: 0x7d
<6>[ 0.098087] Cooling: 82c THD_TEMP:0x80: TRIG_LEV0: 0x89
TRIG_LEV1: 0x99 TRIG_LEV2: 0xa0
Source:
http://www.anandtech.com/show/4686/samsung...est-redefined/7cool stuff. thanks for sharing
btw, since we can only monitor battery temperature, are there any formula to coorelate if the battery temperature is so and so value, the CPU temperature will be so and so higher?